Synthesis and NO2 sensing performances of CuO nanoparticles loaded In2O3 hollow spheres

Zhang, Chao; Huan, Yuchun; Sun, Dongjin; Lu, Yuling

doi:10.1016/j.jallcom.2020.155857

Cited by 37 publications

(11 citation statements)

References 26 publications

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“…2 O 3 based on the cubic crystal structure (space group, la 3 ) reveals that the final agreement factors converge to R p 10.5%, R wp 11.8%, and R exp 4.55% (Fig.2(c)). The lattice constant decreases monotonously with the Cu doping concentration increasing (Fig.2(d)), and the similar results were reported[35,36]. The above results indicate that a large portion of Cu 2+ ions is doped into the In 2 O 3 lattice and a small portion is applied to generate CuO.The SEM images of pristine In 2 O 3 and x%Cu-In 2 O 3 hollow nanofibers indicate the hollow structure, as shown in Fig.…”

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confidence: 84%

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Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

et al. 2022

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One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In2O3 (Cu-In2O3) hollow nanofibers by electrospinning and calcination for detecting H2S. The experimental results show that the Cu doping concentration besides the operating temperature, gas concentration, and relative humidity can greatly affect the H2S sensing performance of the In2O3-based sensors. In particular, the responses of 6%Cu-In2O3 hollow nanofibers are 350.7 and 4201.5 to 50 and 100 ppm H2S at 250 °C, which are over 20 and 140 times higher than those of pristine In2O3 hollow nanofibers, respectively. Moreover, the corresponding sensor exhibits excellent selectivity and good reproducibility towards H2S, and the response of 6%Cu-In2O3 is still 1.5 to 1 ppm H2S. Finally, the gas sensing mechanism of Cu-In2O3 hollow nanofibers is thoroughly discussed, along with the assistance of first-principles calculations. Both the formation of hollow structure and Cu doping contribute to provide more active sites, and meanwhile a little CuO can form p—n heterojunctions with In2O3 and react with H2S, resulting in significant improvement of gas sensing performance. The Cu-In2O3 hollow nanofibers can be tailored for practical application to selectively detect H2S at lower concentrations.

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supporting

confidence: 84%

“…4(b)) reveals that the lattice fringe spacings of 0.29 and 0.41 nm correspond to the (222) and (211) crystal planes of In 2 O 3 , respectively. Based on the previous reports [27,36], the crystal plane corresponding to a lattice fringe spacing of 0.25 nm is the CuO (002). The SADE pattern (Fig.…”

Section: Structure and Morphologymentioning

confidence: 93%

Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

et al. 2022

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“…As shown in Fig. 7(a), O, C, In, and Ag elements were identified in the XPS survey, and no obvious impurity peaks appeared, indicating that the [42]. In the O 1s spectra of Fig.…”

Section: Resultsmentioning

confidence: 89%

“…In the O 1s spectra of Fig. 7(c), the peaks at 531.1 and 529.5 eV correspond to the oxygen vacancy and lattice oxygen, respectively [42]. From Fig.…”

Section: Resultsmentioning

confidence: 92%

“…In general, increasing the Ag at% (< 5 at%) is beneficial for producing more active sites and expanding the electron depletion layer of the sensor. However, excessive Ag clusters on the surface will decrease the number of chemical adsorption sites and thicken the hollow sphere shell, which is not conducive to the spread of gas molecules [42,63]. So the sensor response begins to decrease after the Ag/In atomic ratio exceeds 5%.…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

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Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

et al. 2022

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In order to detect low concentrations of volatile organic compounds (VOCs) for the early diagnosis of lung cancer, sensors based on hollow spheres of In2O3 were prepared through the soft template method. Ag nanoparticle decorated In2O3 composites were synthesized via dipping and annealing. The microstructure, phase composition, element distribution, and state of Ag were analyzed by the scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The gas sensing tests showed that Ag-In2O3 sensors had the highest response to isopropanol at 300 °C. The best response of Ag-In2O3 composite sensor was 5.2, which had a significant improvement compared with only In2O3. Moreover, the response and recovery time of Ag-In2O3 composite sensor was significantly shortened. The improved sensing properties of Ag-In2O3 composite sensor could be attributed to the Schottky barrier created at Ag-In2O3 interface and catalytical effect of Ag.

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The nano-composite of Co-doped g-C3N4 and ZnO sensors for the rapid detection of BTEX gases: stability studies and gas sensing mechanism

Jia

Shao

et al. 2020

J Mater Sci

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Synthesis and NO2 sensing performances of CuO nanoparticles loaded In2O3 hollow spheres

Cited by 37 publications

References 26 publications

Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

The nano-composite of Co-doped g-C3N4 and ZnO sensors for the rapid detection of BTEX gases: stability studies and gas sensing mechanism

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