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Real-time, in-situ, extinction spectroscopy studies on silver-nanoseed formation

journal contribution
posted on 2010-01-01, 00:00 authored by Bin TangBin Tang, S Xu, X Jian, J Tao, W Xu
In this paper, real-time extinction spectroscopy was employed to analyze in situ the fast formation process of silver seeds. The influencing factors for silver-seed formation, including the concentration of the reducer (NaBH 4), the amount of stabilizer (citrate), and the addition procedure of NaBH4, were evaluated. The configuration of the surface plasmon resonance (SPR) spectra of silver nanoparticles, which reflected the morphology of the produced silver seeds, was found to be distinctly affected by the NaBH4 concentration. Homogeneous silver nanoparticles were obtained when the added NaBH4 was lower in concentration than 2.00 mM. In contrast, higher concentrations of reducing agent (>3.00 mM NaBH4) resulted in uneven silver nanoparticles. Mie theory was applied to clarify the correlation of the SPR and the size of the silver seeds. Repeated additions of a small amount of the reducing agent could increase the monodispersity and isotropy of silver seeds. Real-time extinction spectroscopy is a convenient technique that achieves the in-situ and nondestructive measurement of intermediates in the formation process of silver nanoseeds.

History

Journal

Applied spectroscopy

Volume

64

Issue

12

Pagination

1407 - 1415

Publisher

Society for Applied Spectroscopy

Location

Baltimore, Md

ISSN

0003-7028

eISSN

1943-3530

Language

eng

Publication classification

C3.1 Non-refereed articles in a professional journal

Copyright notice

2010, Society for Applied Spectroscopy