期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 28, 页码 18165-18172出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04692
关键词
Ag-WO3; hollow nanosphere; sensor; plasmonic; alcohol
资金
- National University Research Fund [GK261001009]
- Changjiang Scholar and Innovative Research Team [IRT_14R33]
- Overseas Talent Recruitment Project [B14041]
- Chinese National 1000-talent-plan program [1110010341]
Ag nanoparticle (NP)-sensitized WO3 hollow nanospheres (Ag-WO3-HNSs) are fabricated via a simple sonochemical synthesis route. It is found that the Ag-WO3-HNS shows remarkable performance in gas sensors. Field-emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) images reveal that the Agx-WO3 adopts the HNS structure in which WO3 forms the outer shell framework and the Ag NPs are grown on the inner wall of the WO3 hollow sphere. The size of the Ag NPs can be controlled by adjusting the addition amount of WC(l)6 during the reaction. The sensor Agx-WO3 exhibits extremely high sensitivity and selectivity toward alcohol vapor. In particular, the Ag(15nm)-WO3 sensor shows significantly lower operating temperature (230 degrees C), superior detection limits as low as 0.09 ppb, and faster response (7 s). Light illumination was found to boost the sensor performance effectively, especially at 405 and 900 nm, where the light wavelength resonates with the absorption of Ag NPs and the surface oxygen vacancies of WO3, respectively. The improved sensor performance is attributed to the localized surface plasmon resonance (LSPR) effect.
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