Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 1, Pages 438-446Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02697
Keywords
UV photodetector; TiO2 nanocube; Core-shell nanoparticles; Localized surface plasmon resonance; Transient absorption spectroscopy
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Funding
- National Natural Science Foundation of China [51502056, 51202046]
- National Science and Technology Support Project [2015BAI01B05]
- Fundamental Research Funds for the Central Universities [HIT.NSRIF.2013006, HIT.BRETIII.201403]
- Natural Science Foundation of Heilongjiang Province of China [F2016013]
- Open Project Program of Key Laboratory for Photonic and Electric Bandgap Materials, Ministry of Education, Harbin Normal University, China
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A novel photoelectrochemical self-powered ultraviolet photodetector (UVPD) has been assembled employing Ag@SiO2 core-shell nanoparticles (NPs) incorporated TiO2 nanocubes (NCs) as the photoanode. The incorporation of the plasmonic core shell NPs can boost the photocurrent of the self-powered UVPD. Finite difference time domain (FDTD) and transient absorption spectroscopy (TAS) were employed to understand plasmonic enhancement processes. By optimizing the incorporated ratio of Ag@SiO2 NPs, the photocurrent of UVPD with 2 wt % Ag@SiO2 NPs reaches the maximum value in view of the enhanced light harvesting and effective inhibition of charge recombination. More importantly, the UVPD with 2 wt % Ag@SiO2 NPs achieves a high on/off ratio of 8212 and a remarkable responsivity of 0.151 A W-1, combined with a rapid response time, prominent spectral selectivity, and photosensitivity linearity response.
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