Jump to main content
Jump to site search


Optimizing hot carrier effects in Pt-decorated plasmonic heterostructures

Abstract

Hot carrier generation by light in various semiconductors and metallic nanostructures is important for many photocatalytic and photochemical processes, including water and hydrogen splitting. Here, we report on the investigations of hot electron generation and extraction from Pt decorated SiO2-Au nanoparticles using the degradation of methylene blue dye as a test-bed. Enhanced catalytic activity was found with an increase of Pt loading on the surface of the heterostructures. The small size of Au nanoparticles (∼10 nm) decorating silica nanoparticles reduces hot electron collisions and related thermalization processes, since charge carriers have short paths to the surface where reactions take place and where Pt is situated. The heterostructures exhibit a broad plasmonic resonance in the visible wavelength range from 500 to 700 nm and hot carrier generation predominately takes place under resonant excitation. Electron-microscopy characterization and numerical modelling have allowed the optimization of Pt coverage for hot-electron transfer, consisting of a thin Pt shell covering the Au nanoparticle with Pt nanoparticles additionally placed on top. This geometry provides the increased number of active sites for methylene blue degradation and promotes separation of charge carriers generated by plasmonic excitations in Au. Such SiO2-Au-Pt nanoparticles are attractive for hot-electron production due to the tunability of their plasmonic resonance and enhanced catalytic activity.

Back to tab navigation

Publication details

The article was received on 09 Oct 2018, accepted on 14 Nov 2018 and first published on 15 Nov 2018


Article type: Paper
DOI: 10.1039/C8FD00150B
Citation: Faraday Discuss., 2018, Accepted Manuscript
  •   Request permissions

    Optimizing hot carrier effects in Pt-decorated plasmonic heterostructures

    J. U. Salmon-Gamboa, M. Romero-Gómez, D. J. Roth, M. J. Barber, P. Wang, S. M. Fairclough, M. E. Nasir, A. V. Krasavin, W. Dickson and A. Zayats, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00150B

Search articles by author

Spotlight

Advertisements