Improving SERS Activity of Inositol Hexaphosphate Capped Silver Nanoparticles: Fe3+ as a Switcher

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• 作者：Xiaoyu Guo ; Yichen Fu ; Shuyue Fu ; Hui Wang ; Tianxi Yang ; Ying Wen ; Haifeng Yang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 21, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：7227-7232
• 全文大小：347K
• ISSN：1520-510X

文摘

Inositol hexaphosphate (IP₆) capped silver nanoparticles (IP₆@AgNPs) were fabricated as surface-enhanced Raman scattering (SERS) active substrates. SERS activity of IP₆@AgNPs could be further improved via adding due amounts of Fe³⁺ to form Fe³⁺鈥揑P₆@AgNPs. The mechanism of Fe³⁺-induced SERS improvement of IP₆@AgNPs can be attributed to the strong interaction of IP₆ and Fe³⁺, which leads to controllable adjustment of the gap among neighboring nanoparticles to produce 鈥渉ot spots鈥? The above mechanism was confirmed with ultraviolet鈥搗isible (UV-vis) spectroscopy, transmission electron microscope (TEM), dynamic light scattering (DLS), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Such Fe³⁺鈥揑P₆@AgNPs-based SERS system was used to detect Rhodamine 6G (R6G) down to the trace level of 10^鈥?0 mol L^鈥?. Besides, New Fuchsin (NF) was also used as a Raman probe to calculate the enhancement factor (EF) of IP₆@AgNPs without and with Fe³⁺. The SERS activity of IP₆@AgNPs happened extreme decrease after one鈥搚ear storage and could be recovered to great extent aided by the addition of Fe³⁺. The Fe³⁺ optimized IP₆@AgNPs system could be applied to detect thymine at trace level by SERS.