Surface enhanced Raman scattering of brilliant green on Ag nanoparticles and applications in living cells as optical probes

Yuling Wang, Dan Li, Peicai Li, Weidong Wang, Wen Ren, Shaojun Dong*, Erkang Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

In this article, surface enhanced Raman scattering (SERS) of different concentrations of brilliant green (BG) on Ag nanoparticles (AgNPs) has been investigated. The results indicate that only 10-6 M BG can be detected on AgNPs while as low as 10-12 M BG can be detected upon the activation of AgNPs by chloride ions. The additional improvement of the detection of BG mainly derives from the increase of the electromagnetic field around AgNPs and partially from the reorientation of BG on AgNPs induced by chloride ions, which was proved by the different spectra feature in the two systems. Adsorption of BG on AgNPs has also been demonstrated in applications of living cells as optical probes based on SERS, indicating that dye-AgNPs can probe the local environment in the living cells. The related cytotoxicity measurements demonstrated that BG-AgNPs produced little cytotoxicity to the cells, which shows great potential in biomedical applications of BG labeled-AgNPs for SERS nanosensors in cells as optical probes. Meanwhile, SERS spectra of BG on AgNPs in the presence chloride ions are expected to be used in living cells as more sensitive optical probes.

Original languageEnglish
Pages (from-to)16833-16839
Number of pages7
JournalJournal of Physical Chemistry C
Volume111
Issue number45
DOIs
Publication statusPublished - 15 Nov 2007
Externally publishedYes

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