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Title: High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation

Abstract

Bioinspired design has been central in the development of hierarchical nanocomposites. Particularly, the nacre-mimetic brick-and-mortar structure has shown excellent mechanical properties, as well as gas-barrier properties and optical transparency. Along with these intrinsic properties, the layered structure has also been utilized in sensing devices. Here we extend the multifunctionality of nacre-mimetics by designing an optically transparent and electron conductive coating based on PEDOT:PSS and nanoclays Laponite RD and Cloisite Na +. We carry out extensive characterization of the nanocomposite using transmittance spectra (trans-parency), conductive atomic force microscopy (conductivity), contact-resonance force microscopy (mechanical properties), and SEM combined with a variety of stress-strain AFM experiments and AFM numerical simulations (internal structure). We further study the nanoclay’s response to the application of pressure with multifrequency AFM and conductive AFM, whereby increases and decreases in conductivity can occur for the Laponite RD composites. We offer a possible mechanism to explain the changes in conductivity by modeling the coating as a 1-dimensional multibarrier potential for electron transport, and show that conductivity can change when the separation between the barriers changes under the application of pressure, and that the direction of the change depends on the energy of the electrons. We did not observe changes inmore » conductivity under the application of pressure with AFM for the Cloisite Na+ nanocomposite, which has a large platelet size compared with the AFM probe diameter. No pressure-induced changes in conductivity were observed in the clay-free polymer either.« less

Authors:
 [1];  [1];  [1];  [1]
  1. George Washington Univ., Washington, DC (United States). Department of Mechanical and Aerospace Engineering
Publication Date:
Research Org.:
George Washington Univ., Washington, DC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1502934
Grant/Contract Number:  
[SC0011912]
Resource Type:
Accepted Manuscript
Journal Name:
Beilstein Journal of Nanotechnology
Additional Journal Information:
[ Journal Volume: 8]; Journal ID: ISSN 2190-4286
Publisher:
Beilstein Institute
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; biomimetics; conductive AFM; conductive nanocomposites; contact-resonance force microscopy; multifrequency AFM; transparent coatings

Citation Formats

Diaz, Alfredo J., Noh, Hanaul, Meier, Tobias, and Solares, Santiago D. High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation. United States: N. p., 2017. Web. doi:10.3762/bjnano.8.207.
Diaz, Alfredo J., Noh, Hanaul, Meier, Tobias, & Solares, Santiago D. High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation. United States. doi:10.3762/bjnano.8.207.
Diaz, Alfredo J., Noh, Hanaul, Meier, Tobias, and Solares, Santiago D. Wed . "High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation". United States. doi:10.3762/bjnano.8.207. https://www.osti.gov/servlets/purl/1502934.
@article{osti_1502934,
title = {High-stress study of bioinspired multifunctional PEDOT:PSS/nanoclay nanocomposites using AFM, SEM and numerical simulation},
author = {Diaz, Alfredo J. and Noh, Hanaul and Meier, Tobias and Solares, Santiago D.},
abstractNote = {Bioinspired design has been central in the development of hierarchical nanocomposites. Particularly, the nacre-mimetic brick-and-mortar structure has shown excellent mechanical properties, as well as gas-barrier properties and optical transparency. Along with these intrinsic properties, the layered structure has also been utilized in sensing devices. Here we extend the multifunctionality of nacre-mimetics by designing an optically transparent and electron conductive coating based on PEDOT:PSS and nanoclays Laponite RD and Cloisite Na+. We carry out extensive characterization of the nanocomposite using transmittance spectra (trans-parency), conductive atomic force microscopy (conductivity), contact-resonance force microscopy (mechanical properties), and SEM combined with a variety of stress-strain AFM experiments and AFM numerical simulations (internal structure). We further study the nanoclay’s response to the application of pressure with multifrequency AFM and conductive AFM, whereby increases and decreases in conductivity can occur for the Laponite RD composites. We offer a possible mechanism to explain the changes in conductivity by modeling the coating as a 1-dimensional multibarrier potential for electron transport, and show that conductivity can change when the separation between the barriers changes under the application of pressure, and that the direction of the change depends on the energy of the electrons. We did not observe changes in conductivity under the application of pressure with AFM for the Cloisite Na+ nanocomposite, which has a large platelet size compared with the AFM probe diameter. No pressure-induced changes in conductivity were observed in the clay-free polymer either.},
doi = {10.3762/bjnano.8.207},
journal = {Beilstein Journal of Nanotechnology},
number = ,
volume = [8],
place = {United States},
year = {2017},
month = {10}
}

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    • Diaz, Alfredo J.; Eslami, Babak; López-Guerra, Enrique A.
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    • DOI: 10.1063/1.4894837

    Compositional mapping of surfaces in atomic force microscopy by excitation of the second normal mode of the microcantilever
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    • ACS Applied Materials & Interfaces, Vol. 7, Issue 29
    • DOI: 10.1021/acsami.5b04676

    Contact resonance force microscopy with higher-eigenmode for nanoscale viscoelasticity measurements
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