Abstract
This paper described a facile method for preparation of gold nanoparticles with high efficient SERS activity within short reaction time in the presence of an environmentally benign and low-cost reagent named inositol hexaphosphate (IP 6). IP 6 acted as a tunable cross-linker to obtain a suitable separation (about 2 nm) between the neighboring particles for certain surface plasmons by adjusting the dosages of IP 6. When the molar ratio of Au to IP 6 was 10:1, gold particles presented in nano-pearl-necklace pattern, demonstrating the high enhancement factor (>10 7) for 2-mercaptopyridine (2-Mpy) Raman scattering and high stability (>2 months).
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