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Issue 20, 2012
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Sensitive and selective SERS probe for trivalent chromium detection using citrate attached gold nanoparticles

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Abstract

In this article, we have demonstrated a sensitive and selective surface enhanced Raman spectroscopy (SERS) probe, based on citrate-capped gold nanoparticles (AuNPs), for trivalent chromium (Cr3+) detection. After introducing Tween 20 to a solution of citrate-capped AuNPs, the as-prepared Tween 20/citrate–AuNP probe could recognize Cr3+ at a 50 × 10−9 M level in an aqueous medium at a pH of 6.0. Tween 20 can stabilize the citrate-capped AuNPs against conditions of high ionic strength. Due to the chelation between Cr3+ and citrate ions, AuNPs undergo aggregation. As a result, it formed several hot spots and provided a significant enhancement of the Raman signal intensity through electromagnetic (EM) field enhancements. A detailed mechanism for tremendous SERS intensity change had been discussed. The selectivity of this system toward Cr3+ was 400-fold, remarkably greater than other metal ions.

Graphical abstract: Sensitive and selective SERS probe for trivalent chromium detection using citrate attached gold nanoparticles

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Publication details

The article was received on 09 May 2012, accepted on 14 Aug 2012 and first published on 16 Aug 2012


Article type: Paper
DOI: 10.1039/C2NR31985C
Citation: Nanoscale, 2012,4, 6442-6448
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    Sensitive and selective SERS probe for trivalent chromium detection using citrate attached gold nanoparticles

    Y. Ye, H. Liu, L. Yang and J. Liu, Nanoscale, 2012, 4, 6442
    DOI: 10.1039/C2NR31985C

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