Enhanced sensing performance of ZnO nanostructures-based gas sensors: A review

Bhati, Vijendra Singh; Hojamberdiev, Mirabbos; Kumar, Mahesh

doi:10.1016/j.egyr.2019.08.070

Cited by 432 publications

(172 citation statements)

References 157 publications

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“…Therefore, considerable effort has been devoted to enhancing the sensing response of the ZnO gas sensors at the ambient operating temperature, and the surface modication or doping with metal cations have been proved as a facile and effective approach. 12,13 Particularly, the experimental studies have demonstrated that the sensing response to CO of the gas sensors using ZnO nanoparticles could be enhanced by doping with Al metal. 14,15 The density functional theory (DFT) studies on ZnO nanocluster 16 and ZnO nanowire 17 have also conrmed the enhancement of CO adsorption by the effect of Al doping.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the effect of Al doping on CO adsorption at ZnO(101̄0)

Nguyen

Phung

et al. 2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Unraveling the effect of Al doping on CO adsorption at ZnO(101̄0)

Nguyen

Phung

et al. 2020

RSC Adv.

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“…Generally, a gas sensor consists of gas-sensitive films and gas sensor substrate with electrodes, a package, and front-end electronic circuits. The gas-sensitive layer can be realized based on various materials, including organic compounds (e.g., phthalocyanines [2,3]) and metal oxides [4] (e.g., WO 3 [5,6], TiO 2 [7,8], SnO 2 [9,10], In 2 O 3 [11,12], Fe 2 O 3 [13,14], MoO 3 [13,15], ZnO [16][17][18], CuO [19][20][21][22][23][24][25][26][27][28]). The most common methods for metal oxide depositions are magnetron sputtering [29,30], sol-gel [31,32], thermal oxidation [33,34], hydrothermal techniques [35,36], the spray pyrolysis technique [37,38], and the microwave-assisted method [39,40].…”

Section: Introductionmentioning

confidence: 99%

GLAD Magnetron Sputtered Ultra-Thin Copper Oxide Films for Gas-Sensing Application

et al. 2020

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Copper oxide (CuO) ultra-thin films were obtained using magnetron sputtering technology with glancing angle deposition technique (GLAD) in a reactive mode by sputtering copper target in pure argon. The substrate tilt angle varied from 45 to 85° and 0°, and the sample rotation at a speed of 20 rpm was stabilized by the GLAD manipulator. After deposition, the films were annealed at 400 °C/4 h in air. The CuO ultra-thin film structure, morphology, and optical properties were assessed by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), X-ray reflectivity (XRR), and optical spectroscopy. The thickness of the films was measured post-process using a profilometer. The obtained copper oxide structures were also investigated as gas-sensitive materials after exposure to acetone in the sub-ppm range. After deposition, gas-sensing measurements were performed at 300, 350, and 400 °C and 50% relative humidity (RH) level. We found that the sensitivity of the device is related to the thickness of CuO thin films, whereas the best results are obtained with an 8 nm thick sample.

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“…Together with nanostructured ZnO films containing nanosized grains and nanocrystals, 1D and 2D nanostructured materials like nanorods (NRs), nanowires, nanosheets or nanobelts were reported to be effective for the detection of volatile organic compounds including ethanol (EtOH) and acetaldehyde (MeCHO). This broad topic is reviewed, e.g., in [ 18 , 19 , 20 ]. Partial studies dedicated to the detection of EtOH on ZnO NRs can be found in [ 21 ] or [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

Piliai

Tomeček

Hruška

et al. 2020

Sensors

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In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O2/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O2/EtOH/H2O and O2/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon.

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Enhanced sensing performance of ZnO nanostructures-based gas sensors: A review

Cited by 432 publications

References 157 publications

Unraveling the effect of Al doping on CO adsorption at ZnO(101̄0)

Unraveling the effect of Al doping on CO adsorption at ZnO(101̄0)

GLAD Magnetron Sputtered Ultra-Thin Copper Oxide Films for Gas-Sensing Application

New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

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