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Citation: LAI Wen-Zhong, ZHAO Wei, YANG Rong, LI Xing-Guo. Preparation and Optical Properties of Triangular Silver Nanoplates by a Dual-Reduction Method[J]. Acta Physico-Chimica Sinica, ;2010, 26(04): 1177-1183. doi: 10.3866/PKU.WHXB20100437 shu

Preparation and Optical Properties of Triangular Silver Nanoplates by a Dual-Reduction Method

1.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; Department of Chemistry and Biology Engineering, Sanming University, Sanming 365004, Fujian Province, P. R. China

Received Date: 30 August 2009
Available Online: 10 March 2010

Triangular silver nanoplates were successfully prepared by a water-bath heating method. NaBH4 and sodium citrate were both used as reducing agents while polyvinylpyrrolidone (PVP) was used as a surfactant and protective agent. The product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis absorption spectroscopy, and surface-enhanced Raman scattering (SERS) spectrum. The product has a cubic face-centered Ag structure. The triangular silver nanoplates have a border size of (100±40) nmand a thickness of (10±5) nm. A growth mechanism is proposed to account for the formation of triangular nanoplates. The preferential absorption of citrate on different crystal planes of silver nuclei, the encapsulation function of PVP and the existence of lattice defects in silver crystals plays a significant role in the formation of products. Compared with spherical nanoparticles, the triangular silver nanoplates exhibit a different absorption spectrum and strong SERS activity for pyridine (Py) molecules.
- Dual-reduction method,
- Triangular silver nanoplates,
- Growth mechanism,
- Surface plasmon resonance,
- Surface-enhanced Raman scattering spectrum
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