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Ostwald‐Ripening‐Induced Growth of Parallel Face‐Exposed Ag Nanoplates on Micro‐Hemispheres for High SERS Activity
Author(s) -
Zhu Chuhong,
Meng Guowen,
Huang Qing,
Zhang Yao,
Tang Haibin,
Qian Yiwu,
Chen Bin,
Wang Xiujuan
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201300454
Subject(s) - ostwald ripening , nanostructure , materials science , nanotechnology , indium tin oxide , plasmon , chemical engineering , optoelectronics , layer (electronics) , engineering
Ag nanoplates, as two‐dimensional plasmonic nanostructures, have attracted intensive attention due to their strong shape‐dependent optical properties and related applications. Here parallel face‐exposed Ag nanoplates vertically grown on micro‐hemisphere surfaces have been achieved by firstly electrodepositing the micro‐hemispheres assembled by Ag nanoplates, whose planar surfaces are stuck together, on indium tin oxide substrates, and then Ostwald ripening the as‐electrodeposited micro‐hemispheres in water. The sizes of the nanoplates and the gaps between the neighboring nanoplates have been tailored by tuning the Ostwald‐ripening duration, so that the SERS activity of the micro‐hemispheres has been remarkably improved. The improved SERS activity can be well explained by our systematic finite‐element simulation. Therefore, Ostwald ripening offers a route to the synthesis of Ag nanoplates, and the optimization of plasmon coupling and SERS activity of nanostructure‐assembled systems.