Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125352
Keywords
Formaldehyde; Gas sensor; Ag-ZnOsub(2)O(3); n-n heterojunction; Ag decoration
Categories
Funding
- National Natural Science Foundation of China [51872220, 21871217, U1905215, U1705251]
- Fundamental Research Funds for the Central Universities [WUT: 2019IVB050, 2020III027]
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A high-response formaldehyde gas sensor based on Ag-ZnO/In2O3 nanofibers was successfully fabricated, showing superior sensitivity, selectivity and stability, with an ultra-high response value towards formaldehyde. The low detection limit of the sensor can be mainly attributed to the proper design of multi-level heterojunctions, which significantly enhance the sensing performance.
Timely detection of formaldehyde is pivotal because formaldehyde is slowly released from the indoor decorative materials, jeopardizing our healthy. Herein, a high-response formaldehyde gas sensor based on Ag-ZnO/In2O3 nanofibers was successfully fabricated. Compared with all the control samples, the hybrid exhibits superior sensitivity (0.65 ppm(-1)), excellent selectivity (>= 12.5) and durable stability (the deviation value <= 3%). Particularly, an ultra-high response value of about 186 towards 100 ppm of formaldehyde at 260 degrees C was achieved, heading the list of outstanding candidates. Additionally, the limit of detection is as low as 9 ppb. The enhanced gas sensing properties can be mainly attributed to multi-level heterojunctions (n-n heterojunction and Ohmic junction) and the spill-over effect of Ag, ultimately increasing the adsorption of gas molecules on the surface of sensing material. This work verifies that proper design of multi-level heterojunctions significantly upgrade the sensing performance.
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