Controllable Synthesis of Silver Nanoparticle Aggregates for Surface-Enhanced Raman Scattering Studies

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• 作者：Lanlan Sun ; Dongxu Zhao ; Meng Ding ; ZhiKun Xu ; Zhenzhong Zhang ; Binghui Li ; Dezhen Shen
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 25, 2011
• 年：2011
• 卷：115
• 期：33
• 页码：16295-16304
• 全文大小：1143K
• 年卷期：v.115,no.33(August 25, 2011)
• ISSN：1932-7455

文摘

Aggregation of citrate-reduced silver nanoparticles (Ag nps) induced by cetyltrimethylammonium bromide (CTAB) was studied by UV鈥搗is absorption spectra, SEM, and zeta potential measurement. Subsequently, Rhodamin 6G (R6G) and 4-aminothiophenol (4-ATP) were used for testing the SERS activity on these aggregates with very low concentrations, and it was found that the enhancement ability was dependent on the concentration of CTAB. Maximum enhancement was achieved when 0.05 mM CTAB was added, and the enhancement factor (EF) was estimated to be as large as 7.9 脳 10⁶ (a₁) for 4-ATP. The observation is attributed to classical electromagnetic (EM) response of the strongly interacting Ag nps to the optical fields when surface plasmon resonances are induced. Therefore, these nanoparticles aggregates can be 鈥渢uned鈥?to yield maximum SERS enhancement as different concentrations of CTAB are added.