Journal
CHEMICAL PHYSICS LETTERS
Volume 791, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2022.139391
Keywords
Ag@ZnO; Yolk-shell; Gas sensor; Ethanol
Funding
- National Natural Science Foundation [12164037]
- Natural Science Foundation of Ningxia [2021AAC05013/2021AAC03243]
- Key Research Foundation of Department of Science and Technology of Ningxia [2019BEB04019/2020BEB04038]
- Science and Technology Plan Project of Guyuan [NXYLXK2017B11]
- Construction of First-class Discipline in Ningxia Higher Education Institutions (Pedagogy Discipline) [HGZD18-06/HGZD21-06]
- Engineering Research Center of Liupanshan [2020GYKYF011]
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Ag@ZnO yolk-shell nanospheres were fabricated and used as chemical sensors, showing remarkable sensitivity and high response towards ethanol vapor. Compared to regular ZnO nanospheres, Ag@ZnO yolk-shell nanospheres based gas sensor exhibited improved performance.
Ag@ZnO yolk-shell nanospheres (Ag@ZnO YSNSs) are fabricated via a simple sonochemical method for chemical sensor application. It is found that the Ag@ZnO YSNSs exhibits remarkable sensitivity and ultra-high response towards ethanol vapor. Compared with the pristine ZnO hollow nanosphere (ZnO HNSs), Ag@ZnO YSNSs based gas sensor reduced the optimum working temperature from 420 to 320 ?, shorten the response/recovery time from 55/18 to 23/15 s, optimized the detection limit from 5.20 to 0.88 ppm, and enhanced the sensor response from 66 to 250. The unique yolk-void-shell nanostructure, the catalytic effect of noble metal Ag and abundant oxygen vacancies in Ag@ZnO YSNSs are responsible for that improvement.
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