Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates

Abstract We demonstrate that crack propagation in uniaxially strained reduced graphene oxide (rGO) films is substantially dependent on the film thickness, for films in the sub-micron regime. rGO film on flexible polydimethylsiloxane (PDMS) substrate develop quasi-periodic cracks upon application of...

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Autores principales:	Tushar Sakorikar, Maheswari Kavirajan Kavitha, Pramitha Vayalamkuzhi, Manu Jaiswal
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f6419b781dd542139fe486bbe3942c75
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spelling	oai:doaj.org-article:f6419b781dd542139fe486bbe3942c752021-12-02T15:05:37ZThickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates10.1038/s41598-017-02703-22045-2322https://doaj.org/article/f6419b781dd542139fe486bbe3942c752017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02703-2https://doaj.org/toc/2045-2322Abstract We demonstrate that crack propagation in uniaxially strained reduced graphene oxide (rGO) films is substantially dependent on the film thickness, for films in the sub-micron regime. rGO film on flexible polydimethylsiloxane (PDMS) substrate develop quasi-periodic cracks upon application of strain. The crack density and crack width follow contrasting trends as film thickness is increased and the results are described in terms of a sequential cracking model. Further, these cracks also have a tendency to relax when the strain is released. These features are also reflected in the strain-dependent electrical dc and ac conductivity studies. For an optimal thickness (3-coat), the films behave as strain-resistant, while for all other values it becomes strain-responsive, attributed to a favorable combination of crack density and width. This study of the film thickness dependent response and the crack propagation mechanism under strain is a significant step for rationalizing the application of layered graphene-like systems for flexible optoelectronic and strain sensing applications. When the thickness is tuned for enhanced extent of crack propagation, strain-sensors with gauge factor up to ∼470 are realized with the same material. When thickness is chosen to suppress the crack propagation, strain-resistive flexible TiO2- rGO UV photoconductor is realized.Tushar SakorikarMaheswari Kavirajan KavithaPramitha VayalamkuzhiManu JaiswalNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tushar Sakorikar Maheswari Kavirajan Kavitha Pramitha Vayalamkuzhi Manu Jaiswal Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
description	Abstract We demonstrate that crack propagation in uniaxially strained reduced graphene oxide (rGO) films is substantially dependent on the film thickness, for films in the sub-micron regime. rGO film on flexible polydimethylsiloxane (PDMS) substrate develop quasi-periodic cracks upon application of strain. The crack density and crack width follow contrasting trends as film thickness is increased and the results are described in terms of a sequential cracking model. Further, these cracks also have a tendency to relax when the strain is released. These features are also reflected in the strain-dependent electrical dc and ac conductivity studies. For an optimal thickness (3-coat), the films behave as strain-resistant, while for all other values it becomes strain-responsive, attributed to a favorable combination of crack density and width. This study of the film thickness dependent response and the crack propagation mechanism under strain is a significant step for rationalizing the application of layered graphene-like systems for flexible optoelectronic and strain sensing applications. When the thickness is tuned for enhanced extent of crack propagation, strain-sensors with gauge factor up to ∼470 are realized with the same material. When thickness is chosen to suppress the crack propagation, strain-resistive flexible TiO2- rGO UV photoconductor is realized.
format	article
author	Tushar Sakorikar Maheswari Kavirajan Kavitha Pramitha Vayalamkuzhi Manu Jaiswal
author_facet	Tushar Sakorikar Maheswari Kavirajan Kavitha Pramitha Vayalamkuzhi Manu Jaiswal
author_sort	Tushar Sakorikar
title	Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
title_short	Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
title_full	Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
title_fullStr	Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
title_full_unstemmed	Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates
title_sort	thickness-dependent crack propagation in uniaxially strained conducting graphene oxide films on flexible substrates
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f6419b781dd542139fe486bbe3942c75
work_keys_str_mv	AT tusharsakorikar thicknessdependentcrackpropagationinuniaxiallystrainedconductinggrapheneoxidefilmsonflexiblesubstrates AT maheswarikavirajankavitha thicknessdependentcrackpropagationinuniaxiallystrainedconductinggrapheneoxidefilmsonflexiblesubstrates AT pramithavayalamkuzhi thicknessdependentcrackpropagationinuniaxiallystrainedconductinggrapheneoxidefilmsonflexiblesubstrates AT manujaiswal thicknessdependentcrackpropagationinuniaxiallystrainedconductinggrapheneoxidefilmsonflexiblesubstrates
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Thickness-dependent Crack Propagation in Uniaxially Strained Conducting Graphene Oxide Films on Flexible Substrates

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