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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Alumina-coated Ag nanocrystal monolayers as surfaceenhanced Raman spectroscopy platforms for the direct spectroscopic detection of water splitting reaction intermediates
Nano Research, Volume 7, No. 1, Year 2014
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Description
A novel Ag-alumina hybrid surface-enhanced Raman spectroscopy (SERS) platform has been designed for the spectroscopic detection of surface reactions in the steady state. Single crystalline and faceted silver (Ag) nanoparticles with strong light scattering were prepared in large quantity, which enables their reproducible self-assembly into large scale monolayers of Raman sensor arrays by the Langmuir-Blodgett technique. The close packed sensor film contains high density of sub-nm gaps between sharp edges of Ag nanoparticles, which created large local electromagnetic fields that serve as "hot spots" for SERS enhancement. The SERS substrate was then coated with a thin layer of alumina by atomic layer deposition to prevent charge transfer between Ag and the reaction system. The photocatalytic water splitting reaction on a monolayer of anatase TiO2 nanoplates decorated with Pt co-catalyst nanoparticles was employed as a model reaction system. Reaction intermediates of water photo-oxidation were observed at the TiO2/solution interface under UV irradiation. The surface-enhanced Raman vibrations corresponding to peroxo, hydroperoxo and hydroxo surface intermediate species were observed on the TiO2 surface, suggesting that the photo-oxidation of water on these anatase TiO2 nanosheets may be initiated by a nucleophilic attack mechanism. [Figure not available: see fulltext.] © 2014 Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
Authors & Co-Authors
Ling, Xing Yi
United States, Berkeley
University of California, Berkeley
Singapore, Singapore City
School of Physical and Mathematical Sciences
Yan, Ruoxue
United States, Berkeley
University of California, Berkeley
United States, Riverside
University of California, Riverside
Lo, Sylvia
United States, Berkeley
University of California, Berkeley
Hoang, Dat Tien
United States, Berkeley
University of California, Berkeley
Liu, Chong
United States, Berkeley
University of California, Berkeley
Fardy, Melissa A.
United States, Berkeley
University of California, Berkeley
Khan, Sher Bahadar
Saudi Arabia, Jeddah
King Abdulaziz University
Asiri, Abdullah M.
Saudi Arabia, Jeddah
King Abdulaziz University
Bawaked, Salem M.
Saudi Arabia, Jeddah
King Abdulaziz University
Yang, Peidong
United States, Berkeley
University of California, Berkeley
Saudi Arabia, Jeddah
King Abdulaziz University
Statistics
Citations: 35
Authors: 10
Affiliations: 4
Identifiers
Doi:
10.1007/s12274-013-0380-0
ISSN:
19980124
Research Areas
Environmental