In-situ characterization of surface-plasmon-enhanced photocatalysis of Ag decorated black TiO2 by IR-AFM

Shi, Lili; He, Yanling; Peng, Jiahui; Lin, Jingyang; Li, Jiaxing; Shi, Keji; Ng, Alan Man Ching

10.1117/12.2500706

2018

0277-786X

1996-756X

NANOPHOTONICS AND MICRO/NANO OPTICS IV

10823

Beijing, China

1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA

SPIE-INT SOC OPTICAL ENGINEERING

TiO2 thin film photocatalysis has suffered from poor photocatalytic efficiency due to its low surface area-to-volume ratio. The efficiency can be enhanced by narrowing the bandgap, defect engineering or introducing surface plasmonic effect. However, the fabrication process is normally complicated and time consuming. This work offers a simple method to fabricate disordered defect-rich black TiO2 ultrathin film by atomic layer deposition (ALD). Surface defects of TiO2 have been suggested to play a significant role in the process of photocatalysis. With ALD, the bandgap and surface defects of the material can be controlled effectively through the deposition parameters. Surface plasmonic effects could also be introduced by the deposition of Ag nanoclusters via simple thermal evaporation. Absorption at similar to 450 nm was significantly enhanced. The overall photocatalytic behavior of composite material is greatly boosted and we observed an excellent efficiency towards the degradation of organic pollutants such as bisphenol A. The mechanism of surface plasmonic enhanced black TiO2 photocatalysis was studied by in-situ infrared atomic force microscope (IR-AFM) under the illumination of different wavelength. The reaction sites of the composite materials were determined accurately and the working mechanism was discussed.

Surface plasmon Surface defects TiO2 Photocatalysis In-situ characterization IR-AFM

第一 ; 通讯

英语

CPCI-S ; EI

Science & Technology - Other Topics ; Optics

Nanoscience & Nanotechnology ; Optics

WOS:000451754000028

20184906169649

Atomic force microscopy ; Atomic layer deposition ; Efficiency ; Energy gap ; Glass ceramics ; Nanophotonics ; Organic pollutants ; Photocatalysis ; Plasmonics ; Surface defects ; Surface plasmons ; Thermal evaporation ; Titanium dioxide ; Ultrathin films

Precious Metals:547.1 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Coating Techniques:813.1 ; Production Engineering:913.1 ; Materials Science:951

Web of Science

Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

Shi, Lili,He, Yanling,Peng, Jiahui,et al. In-situ characterization of surface-plasmon-enhanced photocatalysis of Ag decorated black TiO2 by IR-AFM[C]. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA:SPIE-INT SOC OPTICAL ENGINEERING,2018.