Flexible Graphene-Based Wearable Gas and Chemical Sensors

Singh, Eric J.; Meyyappan, M.; Nalwa, Hari Singh

doi:10.1021/acsami.7b07063

Cited by 646 publications

(385 citation statements)

References 479 publications

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“…Due to its unique electrical, mechanical, optical, and thermal properties, graphene, a 2D monolayer of sp 2 ‐bonded carbon atoms, has been the focus of a vast number of scientific researches . For decades, tremendous effort has been undertaken to integrate graphene and related materials into real‐world applications to make use of such unique properties in high‐tech end products, such as transistors, light‐emitting diodes, strain sensor, solar cells, biosensor, and chemical/biological sensors . Although there are a number of different techniques in which graphene can be isolated, chemical vapor deposition (CVD) is by far the most promising way to produce structurally well‐defined graphene layers on relatively large areas.…”

Section: Introductionmentioning

confidence: 99%

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

Çıtak

İstanbullu

Şakalak

et al. 2019

Macro Chemistry & Physics

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In this study, the successful transfer of chemical vapor deposition (CVD)‐grown graphene on an ordinary printing paper surface is demonstrated. Pristine paper is not a suitable substrate for graphene transfer because of its fragile and hydrophilic nature against the chemicals used during the transfer process. Two different fluoroalkyl polymers, namely poly(hexafluorobutyl acrylate) (PHFBA) and poly(perfluorodecyl acrylate) (PPFDA) are coated on paper surfaces by an initiated CVD (iCVD) technique to make the paper surfaces hydrophobic. Hydrophobicity is found to be an important factor in order for the graphene to be transferred onto the paper substrate. Although surfaces coated with PPFDA possess better hydrophobicity owing to their longer perfluoroalkyl group and higher roughness, the graphene transfer is found to be more successful on a PHFBA‐coated surface. A thin film of PHFBA on the paper surface acts as a prime layer for effective and defect‐free transfer of graphene and makes the paper surface ideal and robust during the graphene transfer process. The as‐transferred graphene layer on the PHFBA‐coated paper surface shows high conductivity values, even after repeated folding and flattening cycles.

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Section: Introductionmentioning

confidence: 99%

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

Çıtak

İstanbullu

Şakalak

et al. 2019

Macro Chemistry & Physics

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“…[125] Aside from this, GO-based biosensing approaches can obviate the need for cumbersome conventional procedures and empower the capability to produce cost-effective devices, for example by simplifying manufacture processes and saving expensive bioreagents. Importantly, given these outstanding properties, GO may also play a critical role in emerging wearable and flexible devices.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

2018

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IntroductionAs a 2D material, graphene oxide (GO) is a lattice-like nanostructure of hexagonal carbon rings disrupted by oxygen-containing moieties. In 2012, we discussed the outstanding physicochemical properties offered by GO and how these features can be exploited in unprecedented optical biosensing systems. [1] In fact, GO can be processed in suspension, easily complexed with biomolecules, and offers a universal highly efficient long-range photoluminescence quenching agent-among other functional properties. Furthermore, we highlighted that GO photoluminescences with energy transfer donor/acceptor molecules exposed A few years ago, crucial graphene oxide (GO) features such as the carbon/oxygen ratio, number of layers, and lateral size were scarcely investigated and, thus, their impact on the overall optical biosensing performance was almost unknown. Nowadays valuable insights about these features are well documented in the literature, whereas others remain controversial. Moreover, most of the biosensing systems based on GO were amenable to operating as colloidal suspensions. Currently, the literature reports conceptually new approaches obviating the need of GO colloidal suspensions, enabling the integration of GO onto a solid phase and leading to their application in new biosensing devices. Furthermore, most GO-based biosensing devices exploit photoluminescent signals. However, further progress is also achieved in powerful label-free optical techniques exploiting GO in biosensing, particularly using optical fibers, surface plasmon resonance, and surface enhanced Raman scattering. Herein, a critical overview on these topics is offered, highlighting the key role of the physicochemical properties of GO. New challenges and opportunities in this exciting field are also highlighted.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201805043.in a planar surface. [1] However, GO properties can be tailored according to its oxidation degree, lateral size, and number of layers, which was something little explored 6 years ago, and thus their impact on the overall biosensing performance was almost unknown. In addition, most of the biosensing systems based on GO were amenable to working as colloidal suspensions. Though, recent literature reports conceptually new approaches obviating the need of colloidal suspensions, which facilitates integration of GO-based biosensors into the solid phase and allows for their applications in new devices. Furthermore, the majority of the GO-based optical biosensing techniques rely on photoluminescent signals. However, further progress has also been achieved in powerful label-free optical techniques exploiting GO in biosensing. Here, we introduce a progress report on this exciting topic, underscoring challenges and opportunities in (bio)sensing accordingly. Number of LayersGO aqueous suspensions are highly stable in the form of mono layers. However, GO multilayer films can be built via

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“…Graphene modified with metal nanoparticles has been investigated as a platform for detection of molecular H 2 , NO 2 , NH 3 and other hazardous gases . Graphene shows low noise electrical characteristics and is being used as a suitable material for detection of individual entities such as gas molecules when they interact with the surface .…”

Section: Chemical Functionalizationmentioning

confidence: 99%

Bioelectronics and Interfaces Using Monolayer Graphene

et al. 2018

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Graphene is expected to revolutionize several application areas ranging from portable energy conversion and storage to miniaturized biosensors for medical applications. In this endeavor, the control of surface characteristics is an essential aspect for understanding fundamental phenomena occurring at the graphene‐liquid interface. In this comprehensive review, we address recent progress in the investigation of the interfacial characteristics of monolayer graphene and methods for modulating the physical and chemical properties of this interface. We focus on the electrochemistry and field‐effect measurements in liquid, which provide an improved understanding of the unique graphene‐liquid interface, with due consideration of the influence of the underlying substrate and structural defects in graphene. Finally, we present reported examples of using single graphene monolayers in miniaturized devices for realizing sensors, neural interfaces and batteries.

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Flexible Graphene-Based Wearable Gas and Chemical Sensors

Cited by 646 publications

References 479 publications

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

All‐Dry Hydrophobic Functionalization of Paper Surfaces for Efficient Transfer of CVD Graphene

Graphene Oxide as an Optical Biosensing Platform: A Progress Report

Bioelectronics and Interfaces Using Monolayer Graphene

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