• 专利附录
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    • 专利摘要:
    Material comprising oligoglycine tectomers and nanowires. This material is useful as an electrode, as a conductive and transparent hybrid material, and as a ph sensor. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2625024A1
    申请号:ES201531843
    申请日:2015-12-18
    公开日:2017-07-18
    发明作者:Edgar Manuel MUÑOZ DE MIGUEL；Rosa GARRIGA MATEO；Alan Brian DALTON；Izabela JUREWICZ
    申请人:Consejo Superior de Investigaciones Cientificas CSIC；Universidad de Zaragoza；University of Surrey；
    IPC主号:
    专利说明:

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    Material comprising oligoglycine and nanowire tectomers
    DESCRIPTION
    The present invention relates to a multifunctional hybrid material comprising oligoglycine and nanowire tectomers (NWs). Likewise, the present invention relates to the method of obtaining said material and its use as an electrode, as a conductive and transparent hybrid material, and as a pH sensor.
    STATE OF THE TECHNIQUE
    During the last years there has been a great research activity around the study of the synthesis, the properties and applications of various unidimensional materials, and among them are the nanowires (nanowires, NWs). Its unique physical properties depending on its composition, together with its high aspect ratio and surface area, have led to the use of NWs in multiple devices and applications, among which one can cite electronic, electrochemical, photonic, biological applications in Devices
    energy storage, solar cells and sensors (see, for example, Materials Today 2006, 9, 18-27; Advanced Materials 2014, 26, 2137-2184). NWs of very varied compositions and properties have been described, for example metallic NWs (Au, Ag, Pt, Ni, among others), semiconductor NWs (Si, GaN, GaAs, ZnO, PbSe ...), insulating NWs (TiO2, SiO2, among others) and organic NWs (for example, of conductive polymers, Journal of the American Chemical Society 2005, 127, 496-497).
    Silver nanowires (AgnWs) have a very high optical transmission but at the same time very low surface resistance (sheet resistance, Rs) which, combined with their decreasing cost and current large-scale production methods, makes them perfect candidates in the area of transparent and flexible electronics (see, for example, Nano Letters 2012, 12, 3138-3144; ACS Nano 2009, 3, 1767-1774; ACS Applied Materials & Interfaces 2013, 5, 10165-10172; Materials Research Bulletin 2013, 48, 2944-2949; Nanoscale 2014, 6, 946-952). In addition, the synergy of AgNWs with two-dimensional materials such as graphene has been proven to provide additional functionalities to the electrodes, such as mechanical flexibility and improved electronic transport properties, which can make them competitive against ITO (indium and tin oxide ) at a commercial level (Advanced Functional Materials 2014, 24, 7580-7587).
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    Oligoglycins capable of assembling in two-dimensional systems have been described and synthesized either spontaneously or in processes assisted by various surfaces, whose stability is based on the formation of hydrogen bonds (see, for example, ChemBioChem 2003, 4, 147-154 ; Nanotechnologies in Russia 2008, 3, 291-302; J. Org. Chem. 2014, 10, 1372-1382). This type of two-dimensional suprameres are called tectomers. Tectomers are soluble in water as well as in acidic medium. Self-assembly and aggregation are favored by bringing the pH of the medium towards basic values. Tectomers have attracted attention in biomedicine since the adsorption of these peptidic plaques on the surface of the virus blocks the adhesion of the viruses to cells (see, for example, ChemBioChem, 2003, 4, 147-154; Glycoconjugate Journal 2004, 21, 471-478). On the other hand, the availability of tectomers capable of forming perfectly flat and rigid layers of a predetermined thickness is promising for the design of new nanomaterials and as a platform for nanodevices (see, for example, J. Org. Chem. 2014, 10, 1372-1382).
    Therefore, it would be desirable to have AgNW electrodes with improved physicochemical properties that do not require a high AgNW content due to their high cost.
    DESCRIPTION OF THE INVENTION
    Thus, the present invention describes the synergistic effect observed between oligoglycine tectomers and NWs, particularly silver nanowires (AgNWs), which makes it possible to have NWs materials with improved physicochemical properties. In the case of AgNWs, coatings with tectomers significantly reduce the surface resistance (Rs) of the electrode, also acting as moisture barriers and maintaining the transparency of the electrodes. The reduction in Rs obtained without the need to increase the amount of AgNWs, which is of interest due to its high cost and for the manufacture of transparent, flexible, wearable (wearable technology) and cheap electrodes.In addition, the oligoglycine allows the reversible change of the response to external stimuli such as the change in pH which makes it useful for the preparation of sensors.
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    Therefore, one aspect of the present invention relates to a material comprising oligoglycine and nano-wire tectomers (NWs).
    In another embodiment the invention relates to the material as defined above, where the NWs are silver nanowires (AgNWs).
    In another embodiment the invention relates to the material as defined above, where oligoglycine tectomers are deposited on the NWs.
    In another embodiment the invention relates to the material as defined above, characterized in that it is a multilayer substrate system / NWs / tectomers, and preferably as a multilayer substrate system / AgNWs / tectomers.
    In these systems, AgNW / tectomer hybrids remain attached to the substrate, although under certain conditions (for example, by adjusting the pH) they can be detached from the substrates, these hybrid materials constituting conductive and transparent films that can also be transferred. to other substrates in liquid medium.
    In another embodiment the invention relates to the material as defined above, characterized by being conductive and transparent films.
    In another embodiment the invention relates to the material as defined above, characterized in that it is conductive and transparent films that can be transferred to other substrates in liquid medium.
    Another aspect of the present invention relates to the method of obtaining the material as mentioned above comprising:
    i) the deposition, preferably by airbrushing, of NWs on a substrate, preferably where the substrate is selected from glass, polyethylene terephthalate (PET) or polymethylmethacrylate (PMMA); Y
    ii) The deposition of oligoglycine tectomer solutions on the NWs films resulting from step (i).
    For the deposition of the AgNWs, 0.1 mg / mL dispersions in isopropanol diluted from an original 5 mg / mL dispersion were used. The diameter and
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    Average length of the AgNWs used are respectively 60 nanometers and 10 micrometers. Diluted dispersions are used for the manufacture of AgNWs films, whose density on the substrates is controlled by the airbrush volume of the dispersions. The processes of airbrushing of the dispersions of AgNWs are carried out at a pressure of 30 psi and at a distance between the airbrush nozzle and the 10 cm substrates.
    The density of the AgNWs films on the substrates is controlled by the airbrushed volume when dispersions of AgNWs of the same concentration are used, verifying the densities of AgNWs deposited by means of Rs measurements as well as by microscopy topography of atomic forces ( atomic force microscopy, AFM).
    For the tectomer coatings, aqueous solutions of biantennial, triantennial, and tetrantennial oligoglycine were used. The deposition of oligoglycine tectomers on NWs films was carried out by drop-by-drop deposition procedures, by immersion in oligoglycine tectomer solutions ("dip coating"), by dragging the dispersions onto substrates with a blade ("doctor blade"), or by centrifugation ("spin coating"). The density of the AgNWs deposited by airbrushing, and the concentration, volume and type of oligoglycine of the tectomer solutions define the composition of the
    coatings
    For the tectomer coatings, aqueous solutions of biantennial, triantennial, and tetrantennial oligoglycine were used. The deposition of the oligoglycine tectomers on the NWs films can be done by a drop-by-drop procedure, by immersion in solutions of oliogoglycine tectomers (dip dip), by dragging the dispersions onto the substrates with a blade ("doctor blade"), or by centrifugation ("spin coating"). The density of the AgNWs deposited by airbrushing, and the concentration, volume and type of oligoglycine of the tectomer solutions define the composition of the
    coatings
    In another embodiment the invention relates to the process as described above, where step (ii) is carried out drop by drop, by
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    immersion (dip coating), by dragging the dispersions on the substrates with blades (doctor blade) or by centrifugation (spin coating).
    Another aspect of the invention relates to the use of the material as defined above as an electrode or as a transparent conductive component, and preferably as electrodes for transparent electronic and optoelectronic devices, touch screens, solar cells, sensors and biosensors.
    The coating with oligoglycine tectomers also confer antimicrobial and antiviral functionalities to the system, as well as a moisture and self-cleaning / anti-dirt barrier due to the increase in hydrophobicity resulting from the tectomer / NWs synergy.
    Thus, in another embodiment the invention relates to the use of the material as defined above, where the hybrid material has antimicrobial, antiviral, moisture barrier, self-cleaning and anti-dirt properties.
    Another aspect of the present invention relates to the use of the material as defined above, as a hybrid conductive material characterized by presenting transparency values greater than 90%.
    Another aspect of the present invention relates to the use of the material as defined above as a pH sensor.
    Another aspect of the present invention relates to a device comprising the material as defined above.
    The materials of NWs, particularly those of AgNWs, and oligoglycine will act as highly conductive components of potential application in devices such as those mentioned in the previous paragraph, being able to provide the oligoglycine in addition to an improved hydrophobicity as well as new biofunctionalities to the NWs, particularly those of NWs. AgNWs
    On the other hand, the NWs / oligoglycine material, preferably the AgNWs / oligoglycine material, is used as a pH sensor since the change in pH affects
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    to the degree of oligoglycine assembly, which can be monitored by microscopy studies.
    The surface resistance (Rs) is quantified in Ohm / sqr and is represented as Ohm / sqr.
    Throughout the description "oligoglycine tectomers" refers to aggregates of oligoglycine molecules, which assemble themselves forming two-dimensional structures, stable both in solution and on surfaces. These structures are stabilized by the formation of two-dimensional hydrogen bonds between the glycins that exist at the ends of the molecule (called antennas). Thus, these two-dimensional structures can be formed from biantennial, triantennial and tetraantenary oligoglycins. For the invention described herein, this type of oligoglycins has been used, preferably biantennial oligoglycine.
    The term "nanowires" (NWs) refers to quasi-one-dimensional threads, of diameter between 1 nanometer to several tens of nanometers and of typical lengths between several centers of nanometers to several micrometers. The composition of the nanowires can be very varied, on which you depend on their chemical-physical properties. Examples of nanowires include, among other conductive NWs (Au, Ag, Pt, Ni, among others), semiconductor NWs (Si, GaN, GaAs, ZnO, PbSe, among others), insulating NWs (TiO2, SiO2, among others) and NWs organic. In the invention described herein, conductive NWs (Au, Ag, Pt, Ni, among others), semiconductor NWs (Si, GaN, GaAs, ZnO, PbSe, among others) have been preferably used, more preferably conductive NWs, and even more preferably silver nanowires (AgNWs), However, other types of NWs and quasi-dimensional materials are also likely to be employed in these systems if their interaction with oligoglycine tectomers is favorable, either by their nature or composition, or by its functionalization and / or load. Thus, NWs of other compositions and properties as well as other one-dimensional materials such as nanotubes are also likely to be used in these systems if their interaction with oligoglycine tectomers is favorable, either because of their composition, or because of their functionalization.
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    Throughout the description, the "hybrid system" refers to a two-component system: a layer of AgNWs on which the oligoglycine tectomers are deposited, being primarily supported on a substrate.
    Throughout the description and the claims the word "comprises" and its variants are not intended to exclude other technical characteristics, additives, components or steps. For those skilled in the art, other objects, advantages and characteristics of the invention will be derived partly from the description and partly from the practice of the invention. The following examples and figures are provided by way of illustration, and are not intended to be limiting of the present invention.
    BRIEF DESCRIPTION OF THE FIGURES
    FIG. 1 Transmittance (at 550 nm) against Rs of AgNWs films of different densities. A representative image of 3D topography of atomic force microscopy (AFM) of an intermediate density AgNWs film is included in this figure.
    FIG. 2 Left: AFM topograph image of individual plates of oligoglycine tectomers deposited on a glass substrate. Right: Height profile showing that the individual tectomer plates are approximately 5.7 nm thick.
    FIG. 3. The chemical structure of the biantennial oligoglycine, and the representation of its assembly in the form of tectomers deposited on a glass substrate.
    FIG. 4 (a) Surface resistance (Rs) as a function of time of a medium density electrode of AgNWs on which a 0.5 mg / mL solution of biantennial oligoglycine has been deposited, which has dried to dry at room temperature. A scheme of the system used to measure the intensity / voltage curves is included. (b) Change of Rs (in%) as a function of the concentration of oligoglycine in the original aqueous solution.
    FIG. 5 3D representation of AFM topography images of low density AgNWs films deposited on glass substrates, which show (a) aggregates
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    of tectomers and (b) an individual tectomer plate deposited on a low density conductive film of AgNWs. AFM topography images and water contact angle measurements on intermediate density AgNWs films coated with tectomer plates from oligoglycine solutions of concentration (c, f) 0.01 mg / mL, (d, g) 0, 5 mg / mL and (e, h) 1 mg / mL.
    FIG. 6 Assembly and destruction dependent on pH of tectomer plates in solution and on AgNW electrodes. Photograph of oligoglycine solutions at different pH values (b). Transmission electron microscopy (TEM) micrographs of samples of solutions 1 mg / mL of oligoglycine at pH 2.2 (a) and pH 7.4 (c). AFM images showing how the topography of AgNWs / tectomer hybrids deposited on glass substrates changes when exposed to solutions of different pH values (d).
    EXAMPLES
    The invention will be illustrated below by tests carried out by the inventors, which shows the effectiveness of the product of the invention.
    Example 1: Preparation of the material
    For the manufacture of the material, AgNWs have been used, which have high transparency and electrical conductivity, and which have also proved to be exceptional materials for multiple applications ranging from capacitive touch sensors to wearable multifunction sensors (see, for example, Advanced Functional Materials 2014, 24, 7580-7587; Nanoscale 2014, 6, 2345-2352; ACS Nano 2014, 8, 5154-5163). The AgNWs are deposited by airbrushing ("spray coating") on glass substrates, forming layers of different (and controlled) densities. Also the deposition of AgNWs on substrates of polyethylene terephthalate (polyethylene terephthalate, PET) and polymethyl methacrylate (poly) (methyl methacrylate), PMMA), which allows the material to have high transparency and flexibility.
    Tectomer coatings were prepared from aqueous solutions of biantennial, triantennial, and tetrantennial oligoglycine. The deposition of the oligoglycine tectomers on the NWs films was carried out by a drop-by-drop procedure, by immersion in solutions of oliogoglycine tectomers.
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    ("dip coating"), by dragging the dispersions on the substrates with a knife ("doctor blade"), or by centrifugation ("spin coating").
    - "Drop casting": Tectomer solutions were deposited drop by drop on AgNWs films, and allowed to dry at room temperature for 3 hours or until the water evaporated completely.
    - "Dip coating": The solutions were deposited by immersion of the substrate for 10 seconds, after which the substrate retracts from the solution at a speed of 1 mm / min. Once the process has been completed, the substrate with its deposit It is allowed to dry in an upright position for 15 minutes.
    - "Doctor blade": It is a suitable procedure for obtaining large tectomer coatings. 2 mL of tectomer solution was deposited at the end of a substrate and were then spread evenly throughout the substrate. In these experiments the height of the blade used was 50 micrometers, it can be adjusted in each case.
    - "Spin-coating: the solutions of tectomers were deposited on the films of AgNWs deposited by airbrushing, and they are rotated at 2000 rpm for 10 seconds.
    The density of the AgNWs deposited by airbrushing, and the concentration, volume deposited and type of oligoglycine of the tectomer solutions define the composition of the coatings.
    Example 2: Transmittance (T) vs. surface resistance (Rs)
    They get that way! transmittance curves (T) vs Rs. The choice of the deposition system was justified by the fact that airbrushing is industrially scalable and can produce highly transparent films on large substrates. Three types of AgNWs electrodes have been prepared, of Rs = 50 Ohm / sq, 1 kOhm / sq, and 1 MOhm / sq, depending on the density (high, intermediate and low, respectively) of AgNWs in the AgNWs films deposited.
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    As can be seen in Fig. 1, the transmittance is greater than 92% for low densities of AgNWs, and gradually decreases as AgNWs are added. The 3D topography image of atomic force microscopy (AFM) of the intermediate density AgNWs film included in Fig. 1 provides values of Rs ~ 10 kOhm / sqr as! as of 91% transparencies, with 2-3 layers of AgNWs evenly distributed in the substrate.
    Example 3: Morphology of oligoglycine tectomer plates on glass
    AFM microscopy has been used to study the morphology of oligoglycine tectomer plates deposited on a glass substrate. (Fig. 2). The AFM characterization shows that the oligoglycine molecules are assembled forming two-dimensional systems or plates whose sizes are in the micrometer range (Fig. 2 left), each individual plate having thicknesses of approximately 5.7 nm (Fig. 2 right) . Each tectomer plate consists of a coplanar stack of biantennial oligoglycine molecules, facing each other so that their hydrophobic component is always exposed on the surface, as shown in the scheme in Fig. 3. The tectomer plates have a planarity to Atomic level, great surface uniformity and absence of structural defects.
    Example 4: Intensity and voltage as a function of time
    Oligoglycine solutions have been deposited on AgNWs, obtaining intensity / voltage (I-V) curves for each sample as a function of time. The I-V curves of the AgNWs films and the AgNWs / oligoglycine hybrid systems demonstrated excellent ohmic behavior, regardless of the density of AgNWs and the oligoglycine concentration employed.
    The scheme of the system used to make these measurements is shown in Fig. 4a. In intermediate-content films in AgNWs there is an abrupt decrease (between 50-70%) of the initial value of Rs when oligoglycine solutions of 0.5 and 1.0 mg / mL were deposited (Fig. 4.b). This decrease in the value of Rs is due to the action of the tectomer plates that are deposited. The oligoglycine concentration increases during the evaporation process of the deposited solutions, and the tectomer plates and aggregates mechanically press the AgNWs, increasing the contact between individual AgNWs. This increase in conductivity is achieved while maintaining the transparency of the
    starting electrodes (transparency values greater than 90% with changes of
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    Transparency as small as 1% with respect to those of the starting AgNW electrodes have been measured in the AgNWs / oligoglycine materials of this study). In this sense, tectomer plates will behave similarly to that described for graphene, which also mechanically press the AgNWs on which they are deposited (see, for example, Advanced Functional Materials 2014, 24, 7580-7587; ACS Applied Materials & Interfaces 2013, 5, 11756-11761; Sci. Rep. 2013, 3, 1112).
    The effective interaction between oligoglycine and AgNWs in these systems and which gives rise to the synergistic effects described here also entails the significant changes observed by X-ray emitted photoelectron (XPS) spectroscopy in the peaks corresponding to Ag3d, N1s and O1s as consequence of the deposition of tectomer solutions on AgNWs electrodes. This interaction between tectomers and NWs can be modulated if the NWs are functionalized. For example, the electrostatic interactions between the functional groups of the functionalized NWs and the protonated amino terminal groups of the tectomers change the degree of interaction between both components and the structure of the hybrid material.
    Example 5: Hydrophobicity
    Due to the unique way in which the biantennial oligoglycine in the form of tectomers is self-assembled in these experiments, its hydrophobic part is always that exposed to the surface. Because of this, water contact angle studies have been carried out to determine the hydrophobicity of the electrodes of AgNWs coated with tectomers. These studies demonstrate the significant increase in hydrophobicity (~ 90 °) of the AgNW electrodes on which the coating with tectomers is made from solutions of 0.5 and 1.0 mg / mL of biantennial oligoglycine. (Fig. 5) This result indicates that the tectomer coatings act as an effective moisture barrier, providing the system with self-cleaning and anti-dirt functionalities. When the drop of water is deposited on the AgNWs electrode without tectomer coating, by on the contrary, the contact angle of the water decreases from 33 ° to 11 °, which indicates that the water penetrates the conductive film of AgNWs without protection.
    Example 6: AgNWs / oligoglycine hybrids as pH sensors
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    On the other hand, by changing the pH of an oligoglycine solution towards basic or acidic regions, the oligoglycine assembly can be carried out or otherwise destroyed (Fig. 6 ac), since the change in pH can cause the group oligoglycine amino terminal is neutral or charged (Beilstein Journal of Organic Chemistry 2014, 10, 1372-1382). The self-assembly or destruction of the tectomer plates is completely reversible and can be carried out repeatedly. These pH-dependent oligoglycine structural changes can also be observed in hybrid AgNWs / oligoglycine electrodes (Fig. 6.d), and can therefore be considered as pH sensors.
    Oligoglycine coatings provide new biofunctionalities to AgNWs electrodes. Since oligoglycins possess the ability to physically and chemically immobilize viruses and bacteria (Russ J Bioorg Chem 2010, 36, 574-580), their hybridization with AgNWs gives rise to new functionalities that make them useful as biomedical materials. In this sense, the hybrid of AgNWs and two-dimensional peptide systems give rise to the formation of sophisticated nanostructures of intelligent response to the environment. In addition, the interaction of viruses and other analytes to these hybrid systems can be controlled through the functionalization of the amino terminal groups of the oligoglycins, which makes them useful as biosensors or in immobilization of viruses and bacteria. The adhesion of viruses, bacteria, or other analytes to these films and electrodes of tectomeric hybrids and AgNWs can be eliminated by varying the pH of the medium, so that at low pH values the oligoglycine assemblies are destroyed, thus leading! to the materials attached to them.
    权利要求:
    Claims (11)
    [1]
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    1. Material comprising oligoglycine and nanowire tectomers (NWs).
    [2]
    2. The material according to claim 1, wherein the NWs are silver nanowires (AgNWs).
    [3]
    3. The material according to any of claims 1 to 2, wherein the oligoglycine tectomers are deposited on the NWs.
    [4]
    4. Method of obtaining the material according to any of claims 1 to 3, comprising:
    i) the deposition, preferably by airbrushing, of NWs on a substrate, preferably where the substrate is selected from glass, polyethylene terephthalate (PET) or polymethylmethacrylate (PMMA); Y
    ii) The deposition of oligoglycine tectomer solutions on the NWs films resulting from step (i).
    [5]
    5. The method according to claim 4, wherein step (ii) is carried out drop by drop (dip casting), by dip (dip coating), by dragging the dispersions onto the substrates with blades (doctor blade) or by centrifugation (spin coating).
    [6]
    6. Use of the material according to any of claims 1 to 3, as an electrode or as a transparent conductive component.
    [7]
    7. The use according to claim 6, as an electrode for transparent electronic and optoelectronic devices, touch screens, solar cells, sensors and biosensors.
    [8]
    8. The use according to claim 6, wherein the hybrid material has antimicrobial, antiviral, moisture barrier, self-cleaning and anti-dirt properties.
    [9]
    9. Use of the material according to any of claims 1 to 3, as a hybrid conductive material characterized by presenting transparency values greater than 90%.
    [10]
    10. Use of the material according to any of claims 1 to 3, as a pH sensor.
    [11]
    11. Device comprising the material according to any of claims 1 to
    5 3.
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    同族专利:
    公开号 | 公开日
    EP3392264A4|2019-08-21|
    WO2017103317A1|2017-06-22|
    CN108602856A|2018-09-28|
    EP3392264A1|2018-10-24|
    ES2625024B1|2018-05-10|
    JP2019508591A|2019-03-28|
    US20190006057A1|2019-01-03|
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    ES201531843A|ES2625024B1|2015-12-18|2015-12-18|Material comprising oligoglycine and nanowire tectomers|ES201531843A| ES2625024B1|2015-12-18|2015-12-18|Material comprising oligoglycine and nanowire tectomers|
    JP2018551525A| JP2019508591A|2015-12-18|2016-12-16|Materials containing oligoglycine tectomers and nanowires|
    EP16874961.2A| EP3392264A4|2015-12-18|2016-12-16|Material comprising oligoglycine tectomers and nanowires|
    PCT/ES2016/070904| WO2017103317A1|2015-12-18|2016-12-16|Material comprising oligoglycine tectomers and nanowires|
    CN201680081697.7A| CN108602856A|2015-12-18|2016-12-16|A kind of material including oligomeric glycine self-assembly and nano wire|
    US16/063,553| US20190006057A1|2015-12-18|2016-12-16|Material comprising oligoglycine tectomers and nanowires|
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