Ultrafast and sensitive room temperature NH<sub>3</sub> gas sensors based on chemically reduced graphene oxide

Hu, Nantao; Liu, Yang; Wang, Yanyan; Zhang, Liling; Wang, Ying; Huang, Xiaolu; Wei, Liangming

doi:10.1088/0957-4484/25/2/025502

Cited by 258 publications

(121 citation statements)

References 48 publications

(81 reference statements)

Supporting

Mentioning

117

Contrasting

Order By: Relevance

“…8,9 These graphene-based devices have high sensitivity down to ppb levels even at room temperature and outstanding resistance change depending on gas adsorption owing to their sensitive electrical interaction with gas molecules. [10][11][12] Moreover, graphene-based gas sensors have relatively short response and recovery times because the gas molecules are bonded to weak-bonding, which directly affects the electrical properties of graphene. However, intrinsic graphene does not have a functional group, which is a site where specic gas molecules can be adsorbed onto the surface.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Kang

Kim

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

Highly sensitive and wearable chemical sensors for the detection of toxic gas molecules are given significant attention for a variety of applications in human health care and environmental safety. Herein, we demonstrated fiber-type gas sensors based on graphene oxide functionalized with organic molecules such as heptafluorobutylamine (HFBA), 1-(2-methoxyphenyl)piperazine (MPP), and 4-(2-keto-1-benzimidazolinyl)piperidine (KBIP) by assembling functionalized graphene oxide (FGO) on a single yarn fabric. These gas sensors of FGO on yarn exhibited extraordinarily higher sensitivity upon exposure to gas molecules than chemically reduced graphene oxide due to many active functional groups on the GO surface. Furthermore, the mechanical stability and chemical durability of the resulting gas sensors are well-maintained. Based on these results, we expected that our sensors with high sensitive and wearability will provide a good premise for wearable chemical sensors-based multidisciplinary applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Kang

Kim

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Therefore, an ammonia sensor with high response, good selectivity, long-term stability and low detection limit is critical and urgently needed. So far, various materials have been explored to detect NH3 gas, such as SnO2 [2][3][4][5], V2O5 [6], WO3 [7,8], Co3O4 [9,10], ZnO [11][12][13], TiO2 [14], carbon nanotubes [15,16], graphene [17,18], etc. However, the gas response using these materials is not high enough, and the detection limit of ammonia is above ppm level.…”

Section: Introductionmentioning

confidence: 99%

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Wang

Zhang

et al. 2018

Sensors and Actuators B: Chemical

152

View full text Add to dashboard Cite

Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Accepted Manuscript Highlights The silica modified CeO2 nanostructures are synthesized using a sol-hydrothermal route and used as NH3 gas-sensing materials. At room temperature, the 8%silica-CeO2 based gas sensor shows high gas response of 3244% to 80 ppm of NH3 and lower detection limit (0.5 ppm) towards NH3 gas. The gas response of the NH3 sensor has good linear characteristics for NH3 gas detecting. The NH3 sensor exhibits good reproducibility, selectivity and long-term stability to NH3 gas. AbstractThe silica modified CeO2 gas sensing nanomaterials are synthesized using a sol-hydrothermal route. The 8%silica-CeO2 has larger specific surface areas of 83.75 m 2 /g and smaller crystalline size of 11.5 nm than pure CeO2, respectively. Compared to pure CeO2, the 8%silica-CeO2 based gas sensor exhibits significant enhancement 2 NH3 gas-sensing performance. At room temperature, it shows much better gas response of 3244% to 80 ppm of NH3 gas and lower detection limit (0.5 ppm) towards NH3 gas. It is also found that the gas response of the NH3 gas sensors increases linearly with the increase of NH3 gas concentration. Moreover, the NH3 gas sensor have good reversibility, stability and selectivity. The reason of enhanced NH3gas-sensing performance is not only because of the increased specific surface areas, but also due to the electrolytic conductivity of NH4 + and OH -on the surface.

show abstract

“…In particular, when graphene is interfaced with semiconductors it forms Schottky junctions 4 that can be used in solar cells, photo-detectors, three-terminal transistors, and gas sensors [5][6][7][8][9][10][11] . Earlier work has shown that these Schottky diodes under forward-bias can be generally understood within the thermionic emission (TE) model 4,[12][13][14][15] .…”

mentioning

confidence: 99%

Carrier transport in reverse-biased graphene/semiconductor Schottky junctions

Tomer

Rajput

Hudy

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

Reverse-biased graphene (Gr)/semiconductor Schottky diodes exhibit much enhanced sensitivity for gas sensing. However, carrier transport across the junctions is not fully understood yet. Here, Gr/SiC, Gr/GaAs and Gr/Si Schottky junctions under reverse-bias are investigated by temperature-dependent current-voltage measurements. A reduction in barrier height with increasing reverse-bias is observed for all junctions, suggesting electric-field enhanced thermionic emission. Further analysis of the field dependence of the reverse current reveals that while carrier transport in Gr/SiC Schottky junctions follows the Poole-Frenkel mechanism, it deviates from both the Poole-Frankel and Schottky mechanisms in Gr/Si and Gr/GaAs junctions, particularly for low temperatures and fields.

show abstract

Ultrafast and sensitive room temperature NH₃ gas sensors based on chemically reduced graphene oxide

Cited by 258 publications

References 48 publications

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Carrier transport in reverse-biased graphene/semiconductor Schottky junctions

Contact Info

Product

Resources

About

Ultrafast and sensitive room temperature NH3 gas sensors based on chemically reduced graphene oxide

Cited by 258 publications

References 48 publications

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Highly sensitive and wearable gas sensors consisting of chemically functionalized graphene oxide assembled on cotton yarn

Enhanced NH3 gas-sensing performance of silica modified CeO2 nanostructure based sensors

Carrier transport in reverse-biased graphene/semiconductor Schottky junctions

Contact Info

Product

Resources

About

Ultrafast and sensitive room temperature NH₃ gas sensors based on chemically reduced graphene oxide