Ostwald‐Ripening‐Induced Growth of Parallel Face‐Exposed Ag Nanoplates on Micro‐Hemispheres for High SERS Activity1. Issue 28 (5th June 2013)

• Record Type: Journal Article
• Authors: Zhu, Chuhong; Meng, Guowen; Huang, Qing; Zhang, Yao; Tang, Haibin; Qian, Yiwu; Chen, Bin; Wang, Xiujuan
• Is Part Of: Chemistry. Volume 19:Issue 28(2013)
• Page Start: 9211
• Page End: 9217
• Publication Date: 2013-06-05
• Subjects: nanoplates -- nanostructures -- Ostwald ripening -- self‐assembly -- silver; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201300454
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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. Abstract : SERS up : Parallel face‐exposed Ag nanoplates vertically grown on micro‐hemisphere surfaces have been prepared by firstly electrodepositing the micro‐hemispheres assembled by Ag nanoplates, the planar surfaces of which are stuck together, on indium tin oxide (ITO) substrates, and then Ostwald ripening the as‐electrodeposited micro‐hemispheres in water (see figure).