Superior enhancement of NO2 gas response using n-p-n transition of carbon nanotubes/SnO2 nanowires heterojunctions

Nguyet, Quan Thi Minh; Duy, Nguyễn Văn; Phương, Nguyễn Thị; Trung, Nguyễn Ngọc; Hung, Chu Manh; Hòa, Nguyễn Đức; Hieu, Nguyen Van

doi:10.1016/j.snb.2016.07.143

Cited by 54 publications

(16 citation statements)

References 30 publications

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“…For improving the response performance, Nguyet et al fabricated n-p-n heterojunctions of C/SnO 2 nanowires to obtain high enhancement in gas sensing performance. 12 Therefore, the n/p/n heterojunction between SnO 2 nanoparticles and C 60 on the porous nanostructure would be able to enhance the ability of the gas molecules to diffuse and adsorb on the sensing materials, thus promoting the sensor performance.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites

et al. 2017

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“…Thus, the development of NO 2 gas sensors with high sensitivity and low detect limitation is urgently necessary. At present, metal oxide semiconductors with various nanostructures, such as SnO 2 [3][4][5], ZnO [6,7], WO 3 [8,9], and TiO 2 [10], have been well investigated to detect NO 2 owing to their low cost, simple operation, and nontoxic nature. Among them, tungsten oxide, a n-type semiconductor with wide bandgap (2.6-3.2 eV), has been considered as a promising sensing material for the detection of NO 2 because of its low cost, high sensitivity, and good repeatability [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Liu

Ren

et al. 2020

J Adv Ceram

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Hierarchical WO 3 nanomesh, assembled from single-crystalline WO 3 nanowires, is prepared via a hydrothermal method using thiourea (Tu) as the morphology-controlling agent. Formation of the hierarchical architecture comprising of WO 3 nanowires takes place via Ostwald ripening mechanism with the growth orientation. The sensor based on WO 3 nanomesh has good electrical conductivity and is therefore suitable as NO 2 sensing material. The WO 3 nanomesh sensor exhibited high response, short response and recovery time, and excellent selectivity towards ppb-level NO 2 at low temperature of 160 ℃. The superior gas performance of the sensor was attributed to the high-purity hexagonal WO 3 with high specific surface area, which gives rise to enhanced surface adsorption sites for gas adsorption. The electron depletion theory was used for explaining the NO 2 -sensing mechanism by the gas adsorption/desorption and charge transfer happened on the surface of WO 3 nanomesh.

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“…Other types of heterojunctions based on metal oxides that improve gas sensing performances also exist. Duy et al assembled n-p-n heterojunctions with the structure of SnO 2 -carbon nanotube-SnO 2 by the method of CVD combined with spray coating process [ 105 ]. The obtained n-p-n heterojunctions showed a high response of 17.9 to 100 ppm NO 2 at 100 °C.…”

Section: Nanostructured Metal Oxide Heterojunctions For High-performance Gas Sensorsmentioning

confidence: 99%

“…The gas sensing performance of the pure Co 3 O 4 hollow nanocages was significantly improved when composited with PdO nanoparticles (PdO-Co 3 O 4 HNCs), with the sensor response measured to be 2.51 towards 5 ppm acetone at 350 • C (see Figure 6e), which was higher than that of the Other types of heterojunctions based on metal oxides that improve gas sensing performances also exist. Duy et al assembled n-p-n heterojunctions with the structure of SnO2-carbon nanotube-SnO2 by the method of CVD combined with spray coating process [105]. The obtained n-p-n heterojunctions showed a high response of 17.9 to 100 ppm NO2 at 100 °C.…”

Section: Gas Sensors Based On P-p Junctionsmentioning

confidence: 99%

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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Superior enhancement of NO2 gas response using n-p-n transition of carbon nanotubes/SnO2 nanowires heterojunctions

Cited by 54 publications

References 30 publications

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

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Superior enhancement of NO2 gas response using n-p-n transition of carbon nanotubes/SnO2 nanowires heterojunctions

Cited by 54 publications

References 30 publications

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO2/C60/SnO2 composites

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO2/C60/SnO2 composites

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

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Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites

Ultrasensitive room-temperature ethanol detection based on Au functionalized nanoporous SnO₂/C₆₀/SnO₂ composites