Low-temperature formaldehyde gas sensors based on NiO-SnO2 heterojunction microflowers assembled by thin porous nanosheets

Meng, Dan; Liu, Dongyu; Wang, Guosheng; Shen, Yanbai; San, Xiaoguang; Li, Ming; Meng, Fanli

doi:10.1016/j.snb.2018.06.030

Cited by 193 publications

(59 citation statements)

References 47 publications

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“…As a result, ppb-level formaldehyde concentrations were detected for the first time in wood-product emissions and in indoor air with a low-cost solidstate sensor. 176 This is possible by the very high selectivity provided by the simple and modular packed bed sorption column, which cannot be reached typically by sensors alone (e.g., ZnO/ZIF-8 core-shell structures, 177 NiO-SnO 2 microflowers 178 ) or their arrays (e.g., four SnO 2 -based sensors 138 ).…”

Section: Analyte Separation In Timementioning

confidence: 99%

Highly selective gas sensing enabled by filters

et al. 2021

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Section: Analyte Separation In Timementioning

confidence: 99%

Highly selective gas sensing enabled by filters

et al. 2021

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“…By contrast, when the operating temperature is above the optimal value, the ethanol vapor molecule desorption rate is faster than its adsorption rate on the ZnO-NiO surfaces. The chemisorbed oxygen ions on the surfaces of the porous ZnO-NiO nanosheets do not have sufficient reaction time to react with the ethanol vapor molecules and to release the charge carrier back to the oxides owing to a higher surface activation, hence resulting in a decrease in ethanol vapor sensing response [ 24 ]. Notably, no clear summit appeared in the gas-sensing response vs. operating temperature curve for the pristine porous ZnO nanosheets herein.…”

Section: Resultsmentioning

confidence: 99%

Design and Synthesis of Novel 2D Porous Zinc Oxide-Nickel Oxide Composite Nanosheets for Detecting Ethanol Vapor

2020

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The porous zinc oxide-nickel oxide (ZnO-NiO) composite nanosheets were synthesized via sputtering deposition of NiO thin film on the porous ZnO nanosheet templates. Various NiO film coverage sizes on porous ZnO nanosheet templates were achieved by changing NiO sputtering duration in this study. The microstructures of the porous ZnO-NiO composite nanosheets were investigated herein. The rugged surface feature of the porous ZnO-NiO composite nanosheets were formed and thicker NiO coverage layer narrowed the pore size on the ZnO nanosheet template. The gas sensors based on the porous ZnO-NiO composite nanosheets displayed higher sensing responses to ethanol vapor in comparison with the pristine ZnO template at the given target gas concentrations. Furthermore, the porous ZnO-NiO composite nanosheets with the suitable NiO coverage content demonstrated superior gas-sensing performance towards 50–750 ppm ethanol vapor. The observed ethanol vapor-sensing performance might be attributed to suitable ZnO/NiO heterojunction numbers and unique porous nanosheet structure with a high specific surface area, providing abundant active sites on the surface and numerous gas diffusion channels for the ethanol vapor molecules. This study demonstrated that coating of NiO on the porous ZnO nanosheet template with a suitable coverage size via sputtering deposition is a promising route to fabricate porous ZnO-NiO composite nanosheets with a high ethanol vapor sensing ability.

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“…The selectivity of the metal oxide semiconductor sensor is complicated. It is influenced by many factors including their structure, working temperature, bond dissociation energy of gas molecules, and so forth [30]. In this work, the working temperature is considered as the main factor that affects the selectivity of our sensor.…”

Section: Resultsmentioning

confidence: 99%

Selective gas detection using Mn₃O₄/WO₃ composites as a sensing layer

Sun¹,

Yu²,

Wang³

et al. 2019

Beilstein J. Nanotechnol.

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Pure WO3 sensors and Mn3O4/WO3 composite sensors with different Mn concentrations (1 atom %, 3 atom % and 5 atom %) were successfully prepared through a facile hydrothermal method. As gas sensing materials, their sensing performance at different temperatures was systematically investigated for gas detection. The devices displayed different sensing responses toward different gases at specific temperatures. The gas sensing performance of Mn3O4/WO3 composites (especially at 3 atom % Mn) were far improved compared to sensors based on pure WO3, where the improvement is related to the heterojunction formed between the two metal oxides. The sensor based on the Mn3O4/WO3 composite with 3 atom % Mn showed a high selective response to hydrogen sulfide (H2S), ammonia (NH3) and carbon monoxide (CO) at working temperatures of 90 °C, 150 °C and 210 °C, respectively. The demonstrated superior selectivity opens the door for potential applications in gas recognition and detection.

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Low-temperature formaldehyde gas sensors based on NiO-SnO2 heterojunction microflowers assembled by thin porous nanosheets

Cited by 193 publications

References 47 publications

Highly selective gas sensing enabled by filters

Highly selective gas sensing enabled by filters

Design and Synthesis of Novel 2D Porous Zinc Oxide-Nickel Oxide Composite Nanosheets for Detecting Ethanol Vapor

Selective gas detection using Mn₃O₄/WO₃ composites as a sensing layer

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Low-temperature formaldehyde gas sensors based on NiO-SnO2 heterojunction microflowers assembled by thin porous nanosheets

Cited by 193 publications

References 47 publications

Highly selective gas sensing enabled by filters

Highly selective gas sensing enabled by filters

Design and Synthesis of Novel 2D Porous Zinc Oxide-Nickel Oxide Composite Nanosheets for Detecting Ethanol Vapor

Selective gas detection using Mn3O4/WO3 composites as a sensing layer

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Selective gas detection using Mn₃O₄/WO₃ composites as a sensing layer