Studies on NH3 gas sensing by zinc oxide nanowire-reduced graphene oxide nanocomposites

Wang, Tao; Sun, Zhiguo; Huang, Dan; Liu, Yang; Qian, Jiasheng; Hu, Nantao; Yin, Guilin; He, Dannong

doi:10.1016/j.snb.2017.05.162

Cited by 122 publications

(43 citation statements)

References 65 publications

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“…It is mainly because the graphene sheets had high surface areas, and active defects at the graphene-ZnO heterointerfaces and graphene-ZnO heterojunctions exist on the graphene-ZnO. ZnO NW-rGO nanocomposites also showed excellent response (about 19.2%), fast response time and full recovery to NH 3 at room temperature, which was synthesized by Tao Wang et al from Shanghai Jiao Tong University in the same year [91]. rGO-ZnO bilayer thin films prepared by facile sol-airbrush technology had 30% enhancement of R/R 0 to chloroform vapor compared to pure rGO film due to the improvement of film structure, which was synthesized by Tao Titanium dioxide (TiO 2 ) is very promising due to its high specific surface, low cost and robustness in chemical/corrosive atmosphere.…”

Section: Gas Sensors Based On Graphene/metal or Metal Oxide Compositesmentioning

confidence: 99%

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

2018

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Featured Application: gas sensors based on graphene and its derivatives have brilliant development prospects on innovating composite material and designing appropriate structure.Abstract: Gas sensors are devices that convert a gas volume fraction into electrical signals, and they are widely used in many fields such as environmental monitoring. Graphene is a new type of two-dimensional crystal material that has many excellent properties including large specific surface area, high conductivity, and high Young's modulus. These features make it ideally suitable for application for gas sensors. In this paper, the main characteristics of gas sensor are firstly introduced, followed by the preparation methods and properties of graphene. In addition, the development process and the state of graphene gas sensors are introduced emphatically in terms of structure and performance of the sensor. The emergence of new candidates including graphene, polymer and metal/metal oxide composite enhances the performance of gas detection significantly. Finally, the clear direction of graphene gas sensors for the future is provided according to the latest research results and trends. It provides direction and ideas for future research.2 of 21 excellent conductivity, and easy adsorption of gas molecules, and the surface can easily be modified by functional groups, so it has good gas sensing properties.Graphene, a monolayer of graphite sheet consisting of sp 2 hybridized carbon atoms covalently bonded to three other atoms which was first isolated by Geim and Novoselov using micro-mechanical peeling of graphite in 2004, so they won the 2010 Nobel Prize in Physics [8]. Graphene is the thinnest and highest strength material in nature at present and has the advantages of strong electric conductivity and heat conductivity, and is almost transparent and dense, thus attracts people's attention [9].Nowadays, there are many studies about graphene gas sensors focused on the performance improvement in the field of composite materials, computational chemistry and Micro-Electro-Mechanical System (MEMS). Considering the practical application of graphene gas sensor, we need to find the most potential direction. In this article, the development process and the state of art of graphene gas sensors are introduced. The direction of graphene gas sensors for the future is also provided. The review provides important reference for follow-up research work. Gas Sensor Key Parameters of Gas SensorGas sensors are the crucial components to detect the type and concentration of gas. The components can transform gas composition, gas concentration and other information from non-electricity to electricity to achieve the measurement of gas [10].The key parameters of gas sensor measuring performance include the following aspects [11]:

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Section: Gas Sensors Based On Graphene/metal or Metal Oxide Compositesmentioning

confidence: 99%

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

2018

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“…The use of ZnO gas sensors applied to ammonia detection has been studied in different ways. In recent years, these studies are mainly in the pursuit of a large surface-to-volume ratio and heterojunction interface, with a simultaneous positive effect [5][6][7][8]. The metal oxides of ZnO have demonstrated to be fabricated with different structures, among which the nanostructured ZnO such as nanoellipsoids [6], nanorods [8], nanoparticles [9], nanoflowers [10], etc.…”

Section: Introductionmentioning

confidence: 99%

“…The metal or metal oxide materials composited with ZnO are booming [20][21][22][23] and are not listed one by one here. Besides, ZnO formed heterojunctions with other highly conductive materials like rGO [5], SWCNT [24], PPy [25], and PANI [26], helping to reduce the working temperature successfully.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured ZnO/Ag Film Prepared by Magnetron Sputtering Method for Fast Response of Ammonia Gas Detection

Zheng

Wen

et al. 2020

Molecules

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Possessing a large surface-to-volume ratio is significant to the sensitive gas detection of semiconductor nanostructures. Here, we propose a fast-response ammonia gas sensor based on porous nanostructured zinc oxide (ZnO) film, which is fabricated through physical vapor deposition and subsequent thermal annealing. In general, an extremely thin silver (Ag) layer (1, 3, 5 nm) and a 100 nm ZnO film are sequentially deposited on the SiO2/Si substrate by a magnetron sputtering method. The porous nanostructure of ZnO film is formed after thermal annealing contributed by the diffusion of Ag among ZnO crystal grains and the expansion of the ZnO film. Different thicknesses of the Ag layer help the formation of different sizes and quantities of hollows uniformly distributed in the ZnO film, which is demonstrated to hold superior gas sensing abilities than the compact ZnO film. The responses of the different porous ZnO films were also investigated in the ammonia concentration range of 10 to 300 ppm. Experimental results demonstrate that the ZnO/Ag(3 nm) sensor possesses a good electrical resistance variation of 85.74% after exposing the sample to 300 ppm ammonia gas for 310 s. Interestingly, a fast response of 61.18% in 60 s for 300 ppm ammonia gas has been achieved from the ZnO/Ag(5 nm) sensor, which costs only 6 s for the response increase to 10%. Therefore, this controllable, porous, nanostructured ZnO film maintaining a sensitive gas response, fabricated by the physical deposition approach, will be of great interest to the gas-sensing community.

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“…ZnO nanowire reduced graphene oxide nanocomposites based ammonia gas Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. sensor was prepared by T.Wang et al [28] which demonstrates excellent response, good stability and short response and recovery time as compared with RGO or ZnO based ammonia gas sensors. C.Wang et al [29] reported rGO-Graphene hybrid ammonia gas sensor with high sensitivity of 2.8% for 0.5 ppm concentration of ammonia with detection limit of 36 ppb.…”

Section: Introductionmentioning

confidence: 99%

Chemically functionalized graphene oxide thin films for selective ammonia Gas sensing

Kumar

Singh

Kumar

et al. 2020

Mater. Res. Express

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In this work graphene oxide has been functionalized using Para chloro benzoic acid (PCBA). Three different concentrations of PCBA were used for functionalization on the GO surface. Functionalization was confirmed by the study of X-ray diffraction (XRD) and Fourier transform infra-red spectroscopy (FTIR) characterization. Raman characterization was used for the study of defects on the functionalized GO surface. Langmuir-Blodgett technique was used for the deposition of a thin film. This deposited layer was used as a sensing layer for the detection of ammonia gas. Aluminum contacts were made for electrical measurement using thermal evaporation technique and annealed to obtain a good quality of contacts. The sensor behavior was observed for all three concentrations of PCBA and it has been observed that increase in PCBA concentration leads to the high sensor response and the maximum response was observed for the higher concentration of PCBA i.e. 75 mM. The senor was tested for different gas concentrations varied from 100 ppm to 1200 ppm. Also the selectivity and long term stability of prepared devices has been investigated.

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Studies on NH3 gas sensing by zinc oxide nanowire-reduced graphene oxide nanocomposites

Cited by 122 publications

References 65 publications

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

Nanostructured ZnO/Ag Film Prepared by Magnetron Sputtering Method for Fast Response of Ammonia Gas Detection

Chemically functionalized graphene oxide thin films for selective ammonia Gas sensing

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