Simple Fabrication Process for 2D ZnO Nanowalls and  Their Potential Application as a Methane Sensor

Chen, Tse Pu; Chang, Sheng; Hung, Fei-Yi; Chang, Shoou Jinn; Hu, Zheng; Chen, Kuan‐Jen

doi:10.3390/s130303941

Cited by 59 publications

(25 citation statements)

References 24 publications

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“…Among them, many different nanostructures of ZnO such as nanowires, nanorods, nanoparticles, and nanofibers have been proposed as high-performance relative humidity (RH) sensors [93][94][95][96]. Following the increased interest in the Chen et al, in two different papers [90,91], investigated the hydrogen-and methane-sensing performance of 2D ZnO nanowalls. they were directly grown on a glass substrate by thermal evaporation of zinc powder at 450 • C. The fabrication process did not use a metal catalyst or the pre-deposition of a ZnO seed layer on the substrate.…”

Section: Humiditymentioning

confidence: 99%

“…In addition, the better selectivity compared to other species was attributed to the ability of H 2 S to form a metal sulfide on the surface of metal oxides, which leads to a large variation in the resistance. Chen et al, in two different papers [90,91], investigated the hydrogen-and methane-sensing performance of 2D ZnO nanowalls. They were directly grown on a glass substrate by thermal evaporation of zinc powder at 450 °C.…”

Section: Other Gasesmentioning

confidence: 99%

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Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

159

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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Section: Humiditymentioning

confidence: 99%

Section: Other Gasesmentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

159

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“…Pure and doped ZnO films prepared by different methods were found to be sensitive to H 2 S gas. [16][17][18][19][20] ZnO-based gas sensors were also found to be suitable for detection of gases like methane, 21,22 formaldehyde, 23-25 ethanol, [26][27][28][29] ammonia, 30-34 LPG, [35][36][37] methanol, 38 propanol, 38,39 and NO 2 . 18,[40][41][42][43][44] In the present context we report the NO 2 and H 2 S gas sensing characteristics of oxygen-deficient nanocrystalline zinc oxide films prepared by chemical spray pyrolysis (CSP) technique on glass substrates.…”

Section: Introductionmentioning

confidence: 99%

Gas sensing application of nanocrystalline zinc oxide thin films prepared by spray pyrolysis

2015

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Nanocrystalline oxygen-deficient ZnO thinfilm sensors were prepared by spray pyrolysis technique using zinc acetate dissolved in propanol and water as precursor. Response of the sensor to target gases NO 2 and H 2 S is studied. At optimum temperature of 200 • C, the sensors have a response of 3.32 to 7 ppm NO 2 and 1.4 to 18 ppm of H 2 S gas. The analytical characterizations of the prepared sensors were performed using X-ray diffraction measurement, scanning electron microscopy, energy-dispersive X-ray spectroscopy and Raman spectroscopy. Dynamic response of sensors to different concentrations of NO 2 and H 2 S gas was tested at optimum temperature. Experimental data revealed the sensors to be more selective to NO 2 gas with satisfactory response and recovery time.

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“…The fabricated sensor showed good sensing properties towards NO 2 monitoring at room temperature. Chang et al showed excellent sensing behavior towards different gases, including CO, hydrogen and methane, of two-dimensional ZnO nanowalls grown on glass substrate by thermal evaporation at low temperature without any catalysts or the pre-deposition of a ZnO seed layer on the substrate [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Sensing Properties of ZnO Nanowalls-Based Sensors toward Low Concentrations of CO and NO2

et al. 2017

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This work focuses on the synthesis and gas sensing properties of ZnO nanowalls (ZnO NWLs) grown by a simple cheap chemical bath deposition method on a thin layer of aluminum (about 20 nm thick) printed on the Pt interdigitated electrodes area of conductometric alumina platforms. Post-deposition annealing in nitrogen atmosphere at 300 • C enabled the formation of a ZnO intertwined 2D foils network. A wide characterization was carried out to investigate the composition, morphology and microstructure of the nanowalls layer formed. The gas sensing properties of the films were studied by measuring the changes of electrical resistance upon exposure to low concentrations of carbon monoxide (CO) and nitrogen dioxide (NO 2 ) in air. The sensor response to CO or NO 2 was found to be strongly dependent on the operating temperature, providing a means to tailor the sensitivity and selectivity toward these selected target gases.

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Simple Fabrication Process for 2D ZnO Nanowalls and Their Potential Application as a Methane Sensor

Cited by 59 publications

References 24 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Gas sensing application of nanocrystalline zinc oxide thin films prepared by spray pyrolysis

Comparison of the Sensing Properties of ZnO Nanowalls-Based Sensors toward Low Concentrations of CO and NO2

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