Porous, n–p type ultra-long, ZnO@Bi2O3 heterojunction nanorods - based NO2 gas sensor: new insights towards charge transport characteristics

Vishnuraj, Ramakrishnan; Nair, Keerthi G.; Dhakshinamoorthy, Jayaseelan; Ravi, K.R.; Pullithadathil, Biji

doi:10.1039/d0cp00567c

Cited by 30 publications

(13 citation statements)

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“…Porous ZnO nanowires were chemically synthesized by simple hydrothermal method as per our previous reports. 32,33 In this investigation, n-n type ZnO@In 2 O 3 heterojunction nanowires were synthesized by solvothermal process. Briey, 0.5 mM of In(CH 3 COO) 3 $xH 2 O was dissolved in a binary solvent consisting of 1 : 3 fraction of ethylene glycol and ethanol followed by 40 min of vigorous stirring.…”

Section: Synthesis Of Porous Zno@in 2 O 3 Heterojunction Nanowiresmentioning

confidence: 99%

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

et al. 2020

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Section: Synthesis Of Porous Zno@in 2 O 3 Heterojunction Nanowiresmentioning

confidence: 99%

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

et al. 2020

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“…It should be noted that the resulting ZnO featured a very high surface area. Typically, ZnO nanostructures feature a surface area ranging from 3 m 2 /g to 50 m 2 /g [61][62][63][64][65]. The surface area (78.1 m 2 /g) reported here, to the best of the authors' knowledge, is the highest for ZnO nanostructures reported to date (see Table 1).…”

Section: Discussionmentioning

confidence: 83%

Fabrication of High Surface Area Microporous ZnO from ZnO/Carbon Sacrificial Composite Monolith Template

et al. 2022

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Fabrication of porous materials from the standard sacrificial template method allows metal oxide nanostructures to be produced and have several applications in energy, filtration and constructing sensing devices. However, the low surface area of these nanostructures is a significant drawback for most applications. Here, we report the synthesis of ZnO/carbon composite monoliths in which carbon is used as a sacrificial template to produce zinc oxide (ZnO) porous nanostructures with a high specific surface area. The synthesized porous oxides of ZnO with a specific surface area of 78 m2/g are at least one order of magnitude higher than that of the ZnO nanotubes reported in the literature. The crucial point to achieving this remarkable result was the usage of a novel ZnO/carbon template where the carbon template was removed by simple heating in the air. As a high surface area porous nanostructured ZnO, these synthesized materials can be useful in various applications including catalysis, photocatalysis, separation, sensing, solar energy harvest and Zn-ion battery and as supercapacitors for energy storage.

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“…The Fermi level of ZnO is higher than that of Co3O4, inducing the transfer of Oxygen molecules are reported to be more easily adsorbed onto the surface of p-type metal oxides, which is another reason for the improved NO 2 gas sensing performance of the Co 3 O 4 -decorated ZnO nanoparticles. The improvements in the NO 2 gas sensing properties of the SnO-SnO 2 nanocomposites [90], CuO-decorated ZnO nanowires [155], TeO 2 /SnO 2 brush-nanowires [156] and ultra-long ZnO@Bi 2 O 3 heterojunction nanorods [157] can also be attributed to the reasons listed above.…”

Section: Improved Gas Sensing Mechanism Towards Oxidising Gasesmentioning

confidence: 95%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Yang

Lei

et al. 2021

Nanomaterials

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The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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Porous, n–p type ultra-long, ZnO@Bi₂O₃ heterojunction nanorods - based NO₂ gas sensor: new insights towards charge transport characteristics

Abstract: Porous n–p type ultra-long ZnO@Bi2O3 heterojunction nanorods have been synthesized through a solvothermal method and their complex charge transport characteristics pertaining to NO2 gas sensing properties have been investigated.

Cited by 30 publications

References 54 publications

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

Fabrication of High Surface Area Microporous ZnO from ZnO/Carbon Sacrificial Composite Monolith Template

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

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Porous, n–p type ultra-long, ZnO@Bi2O3 heterojunction nanorods - based NO2 gas sensor: new insights towards charge transport characteristics

Abstract: Porous n–p type ultra-long ZnO@Bi2O3 heterojunction nanorods have been synthesized through a solvothermal method and their complex charge transport characteristics pertaining to NO2 gas sensing properties have been investigated.

Cited by 30 publications

References 54 publications

Boosting the performance of NO2 gas sensors based on n–n type mesoporous ZnO@In2O3 heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

Boosting the performance of NO2 gas sensors based on n–n type mesoporous ZnO@In2O3 heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

Fabrication of High Surface Area Microporous ZnO from ZnO/Carbon Sacrificial Composite Monolith Template

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

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Porous, n–p type ultra-long, ZnO@Bi₂O₃ heterojunction nanorods - based NO₂ gas sensor: new insights towards charge transport characteristics

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport

Boosting the performance of NO₂ gas sensors based on n–n type mesoporous ZnO@In₂O₃ heterojunction nanowires: in situ conducting probe atomic force microscopic elucidation of room temperature local electron transport