期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 14, 页码 9506-9513出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00889
关键词
plasmonic photocatalysis; Au; SrTiO3; nanoporous single-crystalline material; isopropyl alcohol photodegradation
资金
- National Basic Research Program of China (973 Program) [2014CB239301]
- National Natural Science Foundation of China [21573158, 51502200, 51502198]
- Natural Science Foundation of Tianjin [15JCYBJC17400, 15JCQNJC03500]
- Peiyang Young Researcher Program of Tianjin University [2015XRX-0019]
Nanoporous single-crystalline SrTiO3 is fabricated at a low temperature of 60 degrees C via a novel approach of sol-gel alkali-dissolution-exothermal reaction. The plasmon-active metal Au is loaded on the nanoporous single-crystalline SrTiO3 material to construct a new kind of plasmonic photocatalyst. Due to the single-crystalline nature and the space confinement effect of pores for Au growing, not only the promoted diffusion efficiency of surface plasmon resonance (SPR)-induce photoelectron is achieved, but also the diffusion region are well optimized via changing the loading amount of Au. Therefore, an optimal sample with 4.8 wt % Au loading exhibits a more than 40-fold photoactivity enhancement under visible-light irradiation compared to the common nanosized SrTiO3 (a commercially available sample) loaded with 5.3 wt % Au which was prepared under the same condition. Furthermore, combining the special nanostructure of Au surface modified nanoporous-single-crystalline SrTiO3 with photocatalytic properties, estimation of the diffusion mean free path of SPR-induce photoelectron can be achieved. This study proposes an alternative approach to enhance the photoactivity of plasmonic photocatalyst via fine designing the semiconductor substrate.
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