Enhancement in alcohol vapor sensitivity of Cr doped ZnO gas sensor

Hassan, Mohammed; Khan, Wasi; Mishra, Prabhash; Islam, S. S.; Naqvi, Andleeb Z.

doi:10.1016/j.materresbull.2017.05.019

Cited by 66 publications

(18 citation statements)

References 36 publications

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“…The peak of C-Zn determines that the bond C-Zn has successfully formed after annealing treatment [28]. As shown in Figure 3d, an asymmetric O 1s spectrum appears at 530.7 eV, which can be attributed to oxygen ions (O 2− ) in the Zn-O bond of the wurtzite structure [29]. The peak at a binding energy of 532.4 eV was wide and had good symmetry, which was attributed to the oxygen chemisorbed on the surface of ZnO/GO NSs, which is closely related to the gas sensitive properties.…”

Section: Resultsmentioning

confidence: 99%

Graphene-Like Porous ZnO/Graphene Oxide Nanosheets for High-Performance Acetone Vapor Detection

Wang

Tian

et al. 2019

Molecules

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In order to obtain acetone sensor with excellent sensitivity, selectivity, and rapid response/recovery speed, graphene-like ZnO/graphene oxide (GO) nanosheets were synthesized using the wet-chemical method with an additional calcining treatment. The GO was utilized as both the template to form the two-dimensional (2-D) nanosheets and the sensitizer to enhance the sensing properties. Sensing performances of ZnO/GO nanocomposites were studied with acetone as a target gas. The response value could reach 94 to 100 ppm acetone vapor and the recovery time could reach 4 s. The excellent sensing properties were ascribed to the synergistic effects between ZnO nanosheets and GO, which included a unique 2-D structure, large specific surface area, suitable particle size, and abundant in-plane mesopores, which contributed to the advance of novel acetone vapor sensors and could provide some references to the synthesis of 2-D graphene-like metals oxide nanosheets.

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Section: Resultsmentioning

confidence: 99%

Graphene-Like Porous ZnO/Graphene Oxide Nanosheets for High-Performance Acetone Vapor Detection

Wang

Tian

et al. 2019

Molecules

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“…In the present work, the observed response time is 28 s, and the corresponding recovery time is 6 s for Cr doped In 2 O 3 film at 25 ppm. Hassan et al [33] obtained the least response and recovery times, which are 15 and 72 s, respectively, for Cr doped ZnO thin film. Han et al [22] reported response/recovery times of 14/10 s for Ce doped In 2 O 3 nanospheres.…”

Section: Response and Recovery Speedmentioning

confidence: 99%

“…The following reasons can be considered for the increase of sensitivity; (i) increase of the surface catalytic effect on the In 2 O 3 surface caused by NH 3 adsorption (ii) the adsorbed oxygen ions heavily interact with more NH 3 species, (iii) the rate of combustion reaction between film surface and the testing gas is increased by increase in NH 3 concentration due to low activation energy. Hassan et al [33] reported the increase of sensing response from the undoped ZnO to Cr doped ZnO thin films by the presence of oxygen defects in the host structure.…”

Section: Ammonia (Nh 3 ) Sensing Studiesmentioning

confidence: 99%

Structural, Magnetic and Gas Sensing Activity of Pure and Cr Doped In2O3 Thin Films Grown by Pulsed Laser Deposition

Prasad

Kumar²,

Mele³

et al. 2021

Coatings

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Pure In2O3 and 6% Cr-doped In2O3 thin films were prepared on a silicon (Si) substrate by pulsed laser deposition technique. The obtained In2O3/In2O3:Cr thin films structural, morphological, optical, magnetic and gas sensing properties were briefly investigated. The X-ray diffraction results confirmed that the grown thin films are in single-phase cubic bixbyte structure with space group Ia-3. The SEM analysis showed the formation of agglomerated spherical shape morphology with the decreased average grain size for Cr doped In2O3thin film compared to pure In2O3film. It is observed that the Cr doped In2O3thin film shows the lower band gap energy and that the corresponding transmittance is around 80%. The X-ray photoelectron spectroscopy measurements revealed that the presence of oxygen vacancy in the doped In2O3film. These oxygen defects could play a significant role to enhance the sensing performance towards chemical species. In the magnetic hysteresis loop, it is clear that the prepared films confirm the ferromagnetic behaviour and the maximum saturation value of 39 emu/cc for Cr doped In2O3 film. NH3 gas sensing studies was also carried out at room temperature for both pure and Cr doped In2O3films, and the obtained higher sensitivity is 182% for Cr doped In2O3, which is about nine times higher than for the pure In2O3 film due to the presence of defects on the doped film surface.

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“…Consequently, the sensitivity [ 59 ], response/recovery time, selectivity, and working temperature [ 60 ] are improved, which, in terms of practical applications, are desirable. Therefore, doping is a viable way of improving the ZnO sensing properties [ 61 ]. Given this, various types of doped ZnO gas sensors have been developed [ 62 ].…”

Section: Experimental Studiesmentioning

confidence: 99%

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Pineda-Reyes

Herrera-Rivera

Rojas-Chávez

et al. 2021

Sensors

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Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

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Enhancement in alcohol vapor sensitivity of Cr doped ZnO gas sensor

Cited by 66 publications

References 36 publications

Graphene-Like Porous ZnO/Graphene Oxide Nanosheets for High-Performance Acetone Vapor Detection

Graphene-Like Porous ZnO/Graphene Oxide Nanosheets for High-Performance Acetone Vapor Detection

Structural, Magnetic and Gas Sensing Activity of Pure and Cr Doped In2O3 Thin Films Grown by Pulsed Laser Deposition

Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

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