Surface modification of silver nanofilms for improved perchlorate detection by surface-enhanced Raman scattering

Jumin Hao, Mei Juan Han, Jinwei Li, Xiaoguang Meng

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Surface-enhanced Raman scattering (SERS), as one of the most sensitive spectroscopic analysis methods, has been investigated extensively for the detection of environmental contaminants in recent years. In this work, we reported the new development of robust SERS substrates for rapid and sensitive sensing of aqueous perchlorate, a widespread environmental contaminant. The fabrication of the substrates consisted of two simple steps: (a) formation of Ag nanofilms on Cu and surface-roughened Cu foils (Ag/Cu and Ag/rCu nanofilms) using a controllable and inexpensive one-step electroless plating process, and (b) surface modification of the Ag nanofilms with cysteamine (Cys) self-assembly monolayer (SAM) (Cys-Ag/Cu and Cys-Ag/rCu substrates). Due to the strong affinity of -NH3+ groups of the Cys molecules for perchlorate ions, the rapid SERS detection of perchlorate has been realized with a limit of detection (LOD) down to 5μgL -1 (ppb) for aqueous samples without need for drying. Various calibration curves with good linear relationships were obtained, indicating the quantification potential of SERS analysis of perchlorate using these new substrates. It was found that the neutral pH yielded the maximum SERS signals, and 85% of original sensitivity was remained in 5days of storage time in the air, indicating the substrates are fairly stable. Within 10 regeneration-reuse cycles, the SERS signals of perchlorate kept in the range of 85-105% of the original value, verifying its reusability.

Original languageEnglish
Pages (from-to)51-57
Number of pages7
JournalJournal of Colloid and Interface Science
Volume377
Issue number1
DOIs
StatePublished - 1 Jul 2012

Keywords

  • Cysteamine
  • Perchlorate detection
  • Silver nanofilm
  • Surface modification
  • Surface-enhanced Raman scattering (SERS)

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