Ammonia gas sensing behavior of graphene surface decorated with gold nanoparticles

Gautam, Madhav; Jayatissa, Ahalapitiya H.

doi:10.1016/j.sse.2012.05.059

Cited by 192 publications

(111 citation statements)

References 41 publications

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“…Several approaches have been reported to enhance the transient response of graphene and carbon nanotube gas sensors to provide faster response and recovery rates such as thermal annealing, 16 UV light irradiation, 34 ethanol treatment, 35 and surface functionalization. 36,37 The gas molecules NH 3 and NO 2 are well-documented in the literature on graphene gas sensors. 34,38,39 While CVD graphene is highly sensitive to NO 2 , it shows relatively low sensitivity to NH 3 .…”

Section: Resultsmentioning

confidence: 99%

3D integrated monolayer graphene–Si CMOS RF gas sensor platform

et al. 2017

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Integration of a complementary metal-oxide semiconductor (CMOS) and monolayer graphene is a significant step toward realizing low-cost, low-power, heterogeneous nanoelectronic devices based on two-dimensional materials such as gas sensors capable of enabling future mobile sensor networks for the Internet of Things (IoT). But CMOS and post-CMOS process parameters such as temperature and material limits, and the low-power requirements of untethered sensors in general, pose considerable barriers to heterogeneous integration. We demonstrate the first monolithically integrated CMOS-monolayer graphene gas sensor, with a minimal number of post-CMOS processing steps, to realize a gas sensor platform that combines the superior gas sensitivity of monolayer graphene with the low power consumption and cost advantages of a silicon CMOS platform. Mature 0.18 µm CMOS technology provides the driving circuit for directly integrated graphene chemiresistive junctions in a radio frequency (RF) circuit platform. This work provides important advances in scalable and feasible RF gas sensors specifically, and toward monolithic heterogeneous graphene-CMOS integration generally. 1-3 In these cases, power and size requirements are not critical, and such sensors tend to be large and bulky. But with the rapid expansion and prevalence of newer technologies like smart phones, cloud computing and the Internet of Things (IoT), mobile sensors are recognized as an essential component in future ubiquitous sensor networks. 4,5 The goals of IoT sensor networks require mobile and untethered sensors in quantities that negate any realistic possibility of individual sensor maintenance or battery replacement. The expectation is that the sheer number of future sensor devices, the "things" of IoT, will preclude human maintenance of individual nodes within large sensor networks. The implications for future device production are then twofold: the sensors must operate at low-power, and the cost of each device should be low enough that the expected orders of magnitude increase in sensor nodes is feasible. Much of current gas sensor research is therefore directed at the need for low-cost, low-power portable gas sensors, as well as integration with the technology platform best suited to meet that need: silicon complementary metal-oxide semiconductor (CMOS).Solid-state gas sensors cover a wide range of technologies, from microelectromechanical thermal and mass sensors to optical and chemiresistive sensors. 6,7 Of these, one of the most common is the chemisresistive sensor, whose relatively simple design and operation make it a strong candidate for CMOS integration.

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Section: Resultsmentioning

confidence: 99%

3D integrated monolayer graphene–Si CMOS RF gas sensor platform

et al. 2017

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“…Fortunately, it is well-known that noble metals, such as Au, Ag, Pd, and Pt, have been widely used to combine with rGO, forming a new type of sensing material for highly selective and sensitive gas sensors [2]. For example, compared to graphene without Pt, significantly improved H 2 detection sensitivity was observed with 1.0 nm Pt film coating [3]; Ag or Au nanoparticle -decorated rGO hybrids improved NH 3 sensing properties over bare rGO [2,4]; selectivity of NO 2 gas was drastically enhanced by the decoration of Al nanoparticle [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Application of Graphene/Silver Nanowires/Gold Nanoparticles Hybrid for Ammonia Gas Sensing

Hoa¹

2018

JST

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Graphene material synthesized from chemical method (reduced Graphene Oxide -rGO) is a promising candidate for gas sensors due to their unique properties. With structure of single layer of bonded sp 2 carbons in a two-dimensional (2D) lattice, rGO have large surface to volume ratio, high conductivity and electron mobility at room temperature. Meanwhile, the different oxygencontaining functional groups (contain dangling bonds) decorated on carbon networks make rGO easily respond with compatible gas molecules. However, the investigating of structure of rGO in micrometer scale shows that the chemical method often results in non-uniform film thickness on substrate due to overlap of rGO sheets. These may disrupt the conductive paths in rGO films and decrease their conductivity. Therefore, gas sensing signal of pristine rGO based sensors is tarnished and the sensors do not recover to their baseline at room temperature. In this study, silver nanowires (AgNWs) and gold nanoparticles (AuNPs) are combined with rGO material to form rGO/AgNWs/AuNPs hybrid. With one-dimensional nanostructure, the AgNWs connects effectively together many rGO islands and reduce significantly their contact resistance so that NH 3 sensing signal is improved and complete recovery of the sensor is nearly achieved at room temperature. Especially, all these signals are further enhanced when the AuNPs (diameter ~ 30 nm) are added into the hybrid.

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“…This is due to its 2-D nature (inert, conductive where the conductivity can be modulated when exposed to various ions, molecules, and gases), mechanically very strong yet flexible so that it can be applied to various shapes and forms, in addition to its tolerance to high temperatures (stable till 700 ∘ C). Journal of Nanomaterials SWCNTs show unique mechanical, chemical, and physical properties [8][9][10] which led to a variety of applications, that is, nanofluids [11,12], scanning probes [13], nanocomposites [14,15], grease [15][16][17], electron magnetic shielding interface [18,19], and sensors [20][21][22][23][24]. CNT polymer nanocomposites have demonstrated good sensing capability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Saline Solution on the Electrical Response of Single Wall Carbon Nanotubes-Epoxy Nanocomposites

Younes¹,

Rahman²,

Ghaferi³

et al. 2017

Journal of Nanomaterials

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The effects of saline solution on the electrical resistance of single wall carbon nanotubes-epoxy nanocomposites have been investigated experimentally. Ultrasonic assisted fabricated 1.0% and 0.5 W/W% SWCNTs epoxy nanocomposites are integrated into a Kelvin structure by smear cast the nanocomposites on a glass wafer. Four metal pads are deposited on the nanocomposites using the beam evaporator and wires are tethered using soldering. The effect of saline solution on the electrical resistance of the nanocomposites is studied by adding drop of saline solution to the surface of the fabricated nanocomposites and measuring electrical resistance. Moreover, the nanocomposites are soaked completely into 3 wt.% saline solution and real-time measurement of the electrical resistance is conducted. It is found that a drop of saline solution on the surface of the nanocomposites film increases the resistance by 50%. Furthermore, the real-time measurement reveals a 40% increase in the resistance of the nanocomposites film. More importantly, the nanocomposites are successfully reset by soaking in DI water for four hours. This study may open the door for using SWCNTs epoxy nanocomposites as scale sensors in oil and gas industry.

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Ammonia gas sensing behavior of graphene surface decorated with gold nanoparticles

Cited by 192 publications

References 41 publications

3D integrated monolayer graphene–Si CMOS RF gas sensor platform

3D integrated monolayer graphene–Si CMOS RF gas sensor platform

Synthesis and Application of Graphene/Silver Nanowires/Gold Nanoparticles Hybrid for Ammonia Gas Sensing

Effect of Saline Solution on the Electrical Response of Single Wall Carbon Nanotubes-Epoxy Nanocomposites

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