Graphene–metal oxide nanohybrids for toxic gas sensor: A review

Chatterjee, Samiran; Chatterjee, Somenath; Ray, Ajoy Kumar; Chakraborty, A.K.

doi:10.1016/j.snb.2015.07.070

Cited by 604 publications

(236 citation statements)

References 127 publications

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“…Metal oxides such as SnO 2 , ZnO, WO 3 , Cu 2 O and Co 3 O 4 are being used in hybrid materials based on graphene to develop toxic gas sensors for analytes such as CO, NO x and NH 3 [76]. Some difficulties for its implementation on a large scale are a lack of reproducibility, non-uniform thickness of the graphene, high sheet resistance and relative inertness to hydrophilic atmospheres.…”

Section: Applications In Gas Sensorsmentioning

confidence: 99%

State-of-the-Art Electronic Devices Based on Graphene

Vargas-Bernal¹

2016

Nanoelectronics and Materials Development

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Graphene can be considered as the material used for electronic devices of this century, due to its excellent physical and chemical properties, which have been studied and implemented from a theoretical basis and have allowed the development of unique and innovative applications. The need for an ongoing study of the state-of-the-art electronic devices is ultimately useful for the progress achieved so far and future project applications. To date, graphene has been used individually in composite, hybrid materials or functional materials. In this chapter, an overview of their applications in nanoelectronics, particularly with an emphasis directed to flexible electronics, is presented. The description of the advantages and properties of graphene at a level of materials science and engineering is presented, in order to spread its enormous potential. In addition, the future prospects of these applications arising from the developments made currently in the laboratory phase are examined.

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Section: Applications In Gas Sensorsmentioning

confidence: 99%

State-of-the-Art Electronic Devices Based on Graphene

Vargas-Bernal¹

2016

Nanoelectronics and Materials Development

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“…[1][2][3] The detection of gases such as H 2 S, SO 2 , and NH 3 , which can be harmful to human health, is necessary in many elds, especially environmental monitoring and process control, due to their toxicity and associated risk to the ecosystem. 4,5 In addition to the various toxic and/or combustible gaseous and liquid products generated at chemical and materials processing plants, ensuring security at airports and other public sites is a clear motivation for tracking and controlling such emissions of chemical analytes.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive detection of low-ppm H₂S gases based on palladium-doped porous silicon sensors

et al. 2018

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In this study, the sensing properties of palladium-doped porous silicon (Pd/p-Si) substrates for low-ppm level detection of toxic H 2 S gas are investigated. A Si substrate with dead-end pores ranging from nanoto macroscale was generated by a combined process of metal-assisted chemical etching (MacE) and electrochemical etching with tuned reaction time, in which nano-Pd catalysts were decorated by Ebeam sputtering deposition. The sensing properties of the Pd/p-Si were enhanced as the thickness of the substrate layer increased; along with the resulting variation in surface area, this resulted in superior H 2 S sensing performances in the low-ppm range (less than 3 ppm), with a detection limit of 300 ppb (sensitivity 30%) at room temperature. Furthermore, the sensor displayed excellent selectivity toward the hazardous H 2 S molecules in comparison with various other reducing gases, including NO 2 , CO 2 , NH 3 , and H 2 , showing its potential for application in workplaces or environments affected by other toxic gases. The enhancement in sensing performance was possibly due to the increased dispersion and surface area of Pd nano-catalysts, which led to an increase in chemisorption sites of adsorbate molecules.

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“…For example, in the functionalization of graphene with metal nanomaterial a sizable energy gap can be opened up in graphene through the quantum confinement effect [7]. This is favorable for using the rGO/metal nanomaterial hybrids to make devices (super capacitors, solar cells, and sensors…).…”

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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Graphene–metal oxide nanohybrids for toxic gas sensor: A review

Cited by 604 publications

References 127 publications

State-of-the-Art Electronic Devices Based on Graphene

State-of-the-Art Electronic Devices Based on Graphene

Ultrasensitive detection of low-ppm H₂S gases based on palladium-doped porous silicon sensors

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

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Graphene–metal oxide nanohybrids for toxic gas sensor: A review

Cited by 604 publications

References 127 publications

State-of-the-Art Electronic Devices Based on Graphene

State-of-the-Art Electronic Devices Based on Graphene

Ultrasensitive detection of low-ppm H2S gases based on palladium-doped porous silicon sensors

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

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Ultrasensitive detection of low-ppm H₂S gases based on palladium-doped porous silicon sensors