首页|(163000)Sensitivity enhanced and selectivity improved ethanol sensor based on ZnIn_2S_4 nanosheet-coated In_2O_3 nanosphere core-shell heterostructure

(163000)Sensitivity enhanced and selectivity improved ethanol sensor based on ZnIn_2S_4 nanosheet-coated In_2O_3 nanosphere core-shell heterostructure

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  • NSTL
  • Elsevier
Constructing core-shell heterostructures can effectively improve the hindered issues such as decreased sensitivity and poor selectivity from the chemoresistive gas sensors in the complex atmosphere. Herein, an effective hydrothermal-water bath treatment combined strategy was designed to obtain the unique ethanol adsorption preferred ZnIn_2S_4 sheet shell/In_2O_3 sphere core (ZnIn_2S_4 @In_2O_3) nanosphere (NS) heterostructures. Particularly, according to the characterization and gas sensing test results, the chemoresistive sensor of ZnIn_2S_4 @In_2O_3 NS-2 with the highest chemisorbed oxygen concentration shows satisfactory selectivity to ethanol vapor, and the response is the highest (54) compared to other composite controls, which is almost 4-fold of that of the pure In_2O_3 NS reference. Besides, the relatively lower working temperature (220 °C), low limit of detection (LOD, 30 ppb) and long-term stability were also obtained. The enhanced performance of the core-shell ZnIn_2S_4 @In_2O_3 NS-2 based sensor may be due to the synergistic effect between ZnIn_2S_4 sheets and In_2O_3 sphere moieties. Meanwhile, the large specific surface area from the outer shell of ZnIn_2S_4 sheets is also another contribution factor, which supplies the most chemisorbed oxygen sites and transportation channels to promote the interfacial gas diffusion, catalytic oxidation and product desorption.

Core-shell heterostructureZnIn_2S_4 @In_2O_3 nanosphereComposite sensorEthanol sensingSynergistic effect

Hongjie Liu、Jiarong Xv、Liwei Wang

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School of Chemistry and Chemical Engineering, Cuangxi University, Nanning 530004, China

School of Resources, Environment and Materials, Guangxi University, MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Nanning 530004, C

School of Marine Sciences, Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning 530004, China

2022

10.1016/j.jallcom.2021.163000

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
年,卷(期)：2022.898
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