Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 205, Issue -, Pages 11-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.12.010
Keywords
Multifunctional microspheres; Ag-Au bimetallic nanostructures; Noble metal catalyst; Surface-enhanced Raman scattering; Finite-difference time-domain
Funding
- National Natural Science Foundation of China [21322607, 21406072, 21471056, 21676093, 91534202]
- Program for New Century Excellent Talents in University [NCET-13-0796]
- Shanghai Educational Development Foundation [14CG29]
- Basic Research Program of Shanghai [14JC1406402, 15JC1401300]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- International Science and Technology Cooperation Program of China [2015DFA51220]
- Fundamental Research Funds for the Central Universities
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Multifunctional Fe3O4@TiO2@Ag-Au microspheres (MS) were synthesized by grafting Ag nanoparticles onto 3-Aminopropyltrimethoxysilane (APTMS) modified Fe3O4@TiO2 MS, followed by galvanic replacement approach to fabricate Ag-Au bimetallic nanostructures with variable bimetallic molar ratios. The composite with Au-to-Ag ratio of 1:1 exhibits optimal catalytic activity for reduction of 4-nitrophenol (4-NP). Furthermore, finite-difference time-domain (FDTD) simulation study shows that incorporating Au-Ag bimetallic nanostructures onto Fe3O4@TiO2 MS significantly increases the effect of the 'hot spot', offering stronger electromagnetic field enhancements. Indeed, the Fe3O4@TiO2@Ag-Au was demonstrated to be an excellent substrate material for in-situ surface-enhanced Raman scattering (SERS) monitoring of the reaction process. Combined with its good magnetic and photocatalytic performance allowing facile recovery, Fe3O4@TiO2@Ag-Au MS shows great potential for multifunctional platform for simultaneous catalysis and in-situ reaction monitoring. (C) 2016 Elsevier B.V. All rights reserved.
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