Composition-controllable p-CuO/n-ZnO hollow nanofibers for high-performance H2S detection

Han, Chaohan; Li, Xiaowei; Shao, Changlu; Ma, Jiangang; Zhang, Xintong; Liu, Yichun

doi:10.1016/j.snb.2019.01.077

Cited by 92 publications

(41 citation statements)

References 52 publications

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“…The 0.04 CuO-ZnO composite hollow spheres prepared by Kim et al exhibited high response to 5 ppm H 2 S (Ra/Rg = 32.4) at 336 • C (Kim et al, 2012). 0.3 CuO-ZnO composite hollow nanofibers showed high performance to H 2 S gas detection at 250 • C (Han et al, 2019a). The response value of CuO modified hollow SnO 2 nanofibers gas sensor to 10 ppm H 2 S gas reached 410 at 125 • C. And this sensor is almost no response to other gases when the temperature is lower than 200 • C indicating the excellent selectivity toward H 2 S gas (Yang et al, 2017).…”

Section: Gas Sensing Mechanismmentioning

confidence: 97%

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Synthesis of Hollow Nanofibers and Application on Detecting SF6 Decomposing Products

Zhou

Wei

et al. 2019

Front. Mater.

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Hollow structured nanofibers have attracted much attention in diverse domains owing to their unique physicochemical properties and characteristics. Gas sensing is one of the most promising applications. In electrical engineering, the detection of SF 6 decomposing gas products is significant to monitor the insulation status online of gas insulated switchgear (GIS). This mini-review presents the developments of hollow structured nanofibers in synthesis strategies and gas sensing application, especially in the detection of SF 6 decomposing gas products, including hydrogen disulfide (H 2 S), sulfur dioxide (SO 2), thionyl fluoride (SOF 2), and sulfuryl fluoride (SO 2 F 2). In addition, the gas sensing mechanism of metal oxide hollow nanofibers based gas sensor are discussed.

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Section: Gas Sensing Mechanismmentioning

confidence: 97%

“…The following equations take H 2 S and SO 2 gas as examples (Han et al, 2019a;Queraltó et al, 2019):…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

Synthesis of Hollow Nanofibers and Application on Detecting SF6 Decomposing Products

Zhou

Wei

et al. 2019

Front. Mater.

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“…On the other hand, Han et al [145] reported the fabrication of 1D p-CuO/n-ZnO hollow nanofibers with high detection performance for H 2 S by the combination of electrospinning and ALD technique [ Fig. 10(c)].…”

Section: Applications Of Ald In Other Sensorsmentioning

confidence: 99%

Atomic layer–deposited nanostructures and their applications in energy storage and sensing

et al. 2019

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“…Oxide semiconductor sensors using a change in a depletion layer enlarged by formation of a p-n junction can be categorized following: the enlargement of depletion layer originates only from p-n junction [7][8][9][10][11][12][13][14][15] ; that from sulfurization on the surface of p-type oxide. Especially, latter contains electronic sensitizing by sulfurization [16][17][18][19][20] , as shown in Table 1. Among the former, the morphology of n-TiO 2 /p-CuO nanowires was effective to enhance sensor response to 1 ppm CO as one of reductant gases when the wall thickness of TiO 2 shell was 60 nm.…”

mentioning

confidence: 99%

“…[7][8][9][10][11][12][13][14][15] , and that from sulfurization on the surface of p-type oxide in Refs. [16][17][18][19][20] . www.nature.com/scientificreports/…”

mentioning

confidence: 99%

Direct observation of potential phase at joining interface between p-MgO and n-MgFe2O4

Sakaguchi

Nara

Hashishin

et al. 2020

Sci Rep

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Visualization of the depletion layer is a significant a guideline for the material design of gas sensors. We attempted to measure the potential barrier at the interface of core–shell microspheres composed of p-MgO/n-MgFe2O4/Fe2O3 from the inside out by means of Kelvin probe force microscopy (KPFM) as a first step to visualizing enlargement of the depletion layer. As determined by high-angle annular dark-field scanning transmission electron microscopy, ca. 70% of the microspheres were hollow with a wall thickness of ca. 200 nm. Elemental mapping revealed that the hollow particles were composed of ca. 20 nm of MgO, ca. 80 nm of MgFe2O4, and ca. 100 nm of Fe2O3. A difference of 0.2 V at the p-MgO/n-MgFe2O4 interface was clarified by KPFM measurements of the hollow particles, suggesting that this difference depends on the formation of a p–n junction. The potential barrier enlarged by the formation of a p–n junction was considered to increase the resistance in air (Ra), since the Ra of the core–shell hollow microspheres was higher than that of MgO, Fe2O3, MgO–Fe2O3, and MgO/MgFe2O4/Fe2O3 particles with irregular shapes. Measurement of the potential barrier height by KPFM is a promising potential approach to tuning the gas sensitivity of oxide semiconductors.

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Composition-controllable p-CuO/n-ZnO hollow nanofibers for high-performance H2S detection

Cited by 92 publications

References 52 publications

Synthesis of Hollow Nanofibers and Application on Detecting SF6 Decomposing Products

Synthesis of Hollow Nanofibers and Application on Detecting SF6 Decomposing Products

Atomic layer–deposited nanostructures and their applications in energy storage and sensing

Direct observation of potential phase at joining interface between p-MgO and n-MgFe2O4

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