Controlling the Selectivity of the Surface Plasmon Resonance Mediated Oxidation of p-Aminothiophenol on Au Nanoparticles by Charge Transfer from UV-excited TiO2

Author(s)

Wang, Jiale ^[1] ; Ando, Romulo A. ^[1] ; Camargo, Pedro H. C. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil

• Document type: Journal article
• Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION; v. 54, n. 23, p. 6909-6912, JUN 1 2015.
• Web of Science Citations: 53

Abstract

Although catalytic processes mediated by surface plasmon resonance (SPR) excitation have emerged as a new frontier in catalysis, the selectivity of these processes remains poorly understood. Here, the selectivity of the SPR-mediated oxidation of p-aminothiophenol (PATP) employing Au NPs as catalysts was controlled by the choice of catalysts (Au or TiO2-Au NPs) and by the modulation of the charge transfer from UV-excited TiO2 to Au. When Au NPs were employed as catalyst, the SPR-mediated oxidation of PATP yielded p,p-dimercaptobenzene (DMAB). When TiO2-Au NPs were employed as catalysts under both UVillumination and SPRexcitation, p-nitrophenol (PNTP) was formed from PATP in a single step. Interestingly, PNTP molecules were further reduced to DMAB after the UVillumination was removed. Our data show that control over charge-transfer processes may play an important role to tune activity, product formation, and selectivity in SPR-mediated catalytic processes. (AU)

• FAPESP's process: 13/19861-6 - Controlled metal nanomaterials for catalysis applications
• Grantee: Pedro Henrique Cury Camargo
• Support type: Regular Research Grants
• FAPESP's process: 13/05709-8 - Palladium, silver-palladium, and Palladium-Platinum nanomaterials: maneuvering shape, composition, and structure for catalytic applications
• Grantee: Jiale Wang
• Support type: Scholarships in Brazil - Post-Doctorate