Outstanding gas sensing performance of CuO-CNTs nanocomposite based on asymmetrical schottky junctions

Zhao, Yiming; Ikram, Muhammad; Zhang, Jiawei; Kan, Kan; Wu, Hongyuan; Song, Wanzhen; Li, Li; Shi, Keying

doi:10.1016/j.apsusc.2017.09.173

Cited by 38 publications

(28 citation statements)

References 47 publications

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“…Another example is the CuO-based nanocomposite prepared with CNTs (carbon nanotubes) and CuO nanorods. As was mentioned earlier (Section 3.1), such gas sensors exhibit an excellent gas sensing performance, i.e., the lowest detectable limit of 970 ppb of NO 2 at room temperature [69]. The electronic transmission ability of CNTs is superior to that of CuO.…”

Section: Film Structure's Influences On the Gas-sensing Mechanismmentioning

confidence: 85%

“…Moreover, the effect of operating temperature on the NO 2 sensing properties of CuO films was thoroughly investigated and reported in [55]. The latest results in this field were presented by Zhao et al [69]. Carbon nanotubes (CNTs) were prepared with CuO nanorods via the facile reflux method.…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

“…In the case of NO2 gas, the gas molecules could attract electrons from the gas-sensitive material because of the high electron affinity to NO2 molecules. Both processes could result in a decrease of electron density, an increase of the hole's density on the surface of the semiconductor, and a rapid decrease of the resistance of the sensor (Figure 7b) [69]. In the case of gas sensors employing single or multiple nanowires between metal electrodes, the gas sensitivity can be attributed to the modulation of the carrier concentration in the nanowire channels or a Schottky barrier at the metal contact.…”

Section: Film Structure's Influences On the Gas-sensing Mechanismmentioning

confidence: 99%

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The Use of Copper Oxide Thin Films in Gas-Sensing Applications

Rydosz

2018

Coatings

109

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In this work, the latest achievements in the field of copper oxide thin film gas sensors are presented and discussed. Several methods and deposition techniques are shown with their advantages and disadvantages for commercial applications. Recently, CuO thin film gas sensors have been studied to detect various compounds, such as: nitrogen oxides, carbon oxides, hydrogen sulfide, ammonia, as well as several volatile organic compounds in many different applications, e.g., agriculture. The CuO thin film gas sensors exhibited high 3-S parameters (sensitivity, selectivity, and stability). Furthermore, the possibility to function at room temperature with long-term stability was proven as well, which makes this material very attractive in gas-sensing applications, including exhaled breath analysis.

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Section: Film Structure's Influences On the Gas-sensing Mechanismmentioning

confidence: 85%

Section: Nitrogen Oxidesmentioning

confidence: 99%

Section: Film Structure's Influences On the Gas-sensing Mechanismmentioning

confidence: 99%

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The Use of Copper Oxide Thin Films in Gas-Sensing Applications

Rydosz

2018

Coatings

109

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“…However, the peak at 285.3 indicates the presence of some defects in the form of C-C carbon. The other peaks at 286.7, 288.9, and 291.5 eV are ascribed to C-O, O-C=O, and COOH groups, correspondingly present in the nanocomposite [1,9]. The bonding states of the constituent elements, as mentioned above, assert that CuO nanocrystals form heterojunctions with SWCNTs through the formation of covalent bonds-specifically, CuO-SWCNTs or Cu-OOC-SWCNTs-or through bonding via van der Waals forces.…”

Section: Curves C To E Inmentioning

confidence: 94%

“…The other component at 531.15 eV represents the vacant oxygen sites. The third component at a higher binding energy represents surface-chemisorbed O in the form of OH, H2O, or O2, indicating the existence of loosely bound oxygen species adjoining the surface region of the CuO nanocrystals[9].…”

mentioning

confidence: 99%

Enhanced Visible-Light Photocatalysis of Nanocomposites of Copper Oxide and Single-Walled Carbon Nanotubes for the Degradation of Methylene Blue

et al. 2020

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We report enhanced catalytic action of a series of copper(II)-oxide-single-walled carbon nanotube (CuO-SWCNT) composite photocatalysts (abbreviated as CuO-SWCNT-0.5, CuO-SWCNT-2, and CuO-SWCNT-5, where 0.5, 2, and 5 represent the calcination time in hours) synthesized via recrystallization followed by calcination. The photocatalytic performance of the fabricated nanocomposites was examined by evaluating the degradation of methylene blue (MB) under irradiation with visible light. All of the as-fabricated nanocomposites were effective photocatalysts for the photodegradation of a MB solution; however, the CuO-SWCNT-5 displayed the best photocatalytic ability among the investigated catalysts, achieving 97.33% degradation of MB in 2 h under visible-light irradiation. The photocatalytic action of the nanocomposites was remarkably higher than that of pristine CuO nanocrystals fabricated using the same route. The recyclability of the photocatalyst was also investigated; the CuO-SWCNT-5 catalyst could be reused for three cycles without substantial degradation of its catalytic performance or morphology.

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