Reduced Graphene Oxide Molecular Sensors

Robinson, Jeremy T.; Perkins, F. Keith; Snow, E. S.; Wei, Zhongqing; Sheehan, Paul E.

doi:10.1021/nl8013007

Cited by 1,671 publications

(1,156 citation statements)

References 22 publications

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“…A constant response of 40% with a variation of 4.1% was observed when the sensor was exposed to a saturated methanol vapor for three successive cycles, indicating good repeatability and stability (Figure 5a,b). The response displayed by this 3D S‐RGOH sensor to organic vapors is comparable to that of the previous reported RGO/Gr‐based sensors 14, 20, 27, 41. Compared with its unmodified counterpart, the S‐RGOH sensor exhibits more than two orders of magnitude higher responses to these organic vapors,27 demonstrating the effectiveness of chemical functionalization in improving its sensitivity.…”

Section: Resultssupporting

confidence: 85%

“…The good reversibility displayed by this 3D S‐RGOH‐based NO 2 sensor is different from those of RGO and carbon nanotube based NO 2 sensors, which usually require UV light or elevated temperature to improve the recovery 19. Analysis of the response curve of the S‐RGOH sensor divides it into two stages: rapid and slow response stages, respectively (Figure S1, Supporting Information) 14. The response in the rapid response stage produced the t 50 as short as 12 s. The fast response was attributed to molecular adsorption on low‐energy binding sites, such as sp 2 ‐bonded carbon.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption of trace amounts of gas molecules on Gr surface causes significant charge transfer between Gr and gas molecules, resulting in a noticeable conductance change of Gr 5, 11. Since the pioneering work reported the capability of Gr to detect a single NO 2 molecule,12 Gr materials fabricated via various strategies, such as mechanical exfoliation,12, 13, 14 chemical vapor deposition,1, 9, 15, 16 epitaxial growth,17 and chemically18, 19, 20, 21 or thermally22 reduced graphene oxide (RGO) have been exploited for gas sensing. Among them, RGO has attracted widespread attention for this purpose due to the low cost and high yield in production, and the convenience of modifying it with functional groups or doping atoms to tailor its gas sensing properties 19, 23.…”

Section: Introductionmentioning

confidence: 99%

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A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

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Reduced graphene oxide (RGO) has proved to be a promising candidate in high‐performance gas sensing in ambient conditions. However, trace detection of different kinds of gases with simultaneously high sensitivity and selectivity is challenging. Here, a chemiresistor‐type sensor based on 3D sulfonated RGO hydrogel (S‐RGOH) is reported, which can detect a variety of important gases with high sensitivity, boosted selectivity, fast response, and good reversibility. The NaHSO3 functionalized RGOH displays remarkable 118.6 and 58.9 times higher responses to NO2 and NH3, respectively, compared with its unmodified RGOH counterpart. In addition, the S‐RGOH sensor is highly responsive to volatile organic compounds. More importantly, the characteristic patterns on the linearly fitted response–temperature curves are employed to distinguish various gases for the first time. The temperature of the sensor is elevated rapidly by an imbedded microheater with little power consumption. The 3D S‐RGOH is characterized and the sensing mechanisms are proposed. This work gains new insights into boosting the sensitivity of detecting various gases by combining chemical modification and 3D structural engineering of RGO, and improving the selectivity of gas sensing by employing temperature dependent response characteristics of RGO for different gases.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

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“…9Ϫ13 Recent work has also been published using chemically produced graphene as a chemical sensor. 14 Here we report the development of useful chemical sensors based on chemically converted graphene using spincoating of hydrazine dispersions on interdigitated planar electrode arrays, as shown in Figure 1. Preliminary results are presented on the detection of NO 2 and NH 3 using this simple and scalable fabrication method for practical devices.…”

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confidence: 99%

Practical Chemical Sensors from Chemically Derived Graphene

et al. 2009

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We report the development of useful chemical sensors from chemically converted graphene dispersions using spin coating to create single-layer films on interdigitated electrode arrays. Dispersions of graphene in anhydrous hydrazine are formed from graphite oxide. Preliminary results are presented on the detection of NO 2 , NH 3 , and 2,4-dinitrotoluene using this simple and scalable fabrication method for practical devices. Current versus voltage curves are linear and ohmic in all cases, studied independent of metal electrode or presence of analytes. The sensor response is consistent with a charge transfer mechanism between the analyte and graphene with a limited role of the electrical contacts. A micro hot plate sensor substrate is also used to monitor the temperature dependence of the response to nitrogen dioxide. The results are discussed in light of recent literature on carbon nanotube and graphene sensors.

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“…Here the oxygen groups can act as adsorption sites, which would make the gas molecules easier to adsorb on the graphene. By forming GO continuous film on an insulating substrate from the aqueous dispersion, Sheehan et al fabricated GO‐based gas sensors 112. What's more, the active oxygen defects on the surface could selectively detect different molecules.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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Reduced Graphene Oxide Molecular Sensors

Abstract: ABSTRACT

Cited by 1,671 publications

References 22 publications

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

Practical Chemical Sensors from Chemically Derived Graphene

Human‐Like Sensing and Reflexes of Graphene‐Based Films

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