Facile Fabrication of SERS-based Microchannel Device for Hazardous Chemical Analysis†

doi:10.7503/cjcu20140621

Abstract

Abstract:

Surface-enhanced Raman scattering(SERS)-based microchannel device was fabricated by self-assembling silver colloids. The detection limits of the device for rhodamine 6G(R6G) and 4-mercaptopyridine(4-MPY) were as low as 10^-11 and 10^-8 mol/L, respectively, therefore, the device is a very efficient SERS-active substrate. Furthermore, two hazardous chemicals, Thiram and Melamine, were detected by the microchannel device. The detection limits for Melamine and Thiram were 10^-6 and 10^-7 mol/L, respectively. The results show that the microchannel device can be used to analyze these two harmful chemicals. It can be used as a miniature SERS sampling setup to detect trace amount of chemicals and for on-line or in-situ detection, and have the potential for the microanalysis of liquid chemicals.

Key words: Surface-enhanced Raman scattering(SERS), Microchannel device, Melamine, Thiram

CLC Number:

O657.3
O641

TrendMD:

YANG Yongan, XU Shuping, WANG Yuyang, QI Guohua, XU Weiqing. Facile Fabrication of SERS-based Microchannel Device for Hazardous Chemical Analysis^†[J]. Chem. J. Chinese Universities, 2015, 36(2): 254.

Figures/Tables 9

Fig.1 UV-Vis spectrum of the silver colloid Inset shows the photograph of microchannel device.

Fig.2 Cross-sectional SEM image of an Ag-coated microchannel device

Fig.3 SERS spectra of R6G with different concentrations in aqueous solution λex=514 nm; integration time: 10 s; concentration of R6G/(mol·L-1): a.10-8, b. 10-9, c. 10-10, d. 10-11.

Fig.4 SERS spectra of 4-MPY with different concentrations in aqueous solution

Fig.5 SERS intensity of the peak at 1096 and 1578 cm-1 collected from 20 different positions and the relative standard diviation

Fig.6 SERS spectra of Melamine with different concentrations in aqueous solution λex=633 nm; integration time: 10 s; concentration of Melamine/(mol·L-1): a.10-3, b. 10-4, c. 10-5, d. 10-6, e. solid.

Fig.7 SERS spectra of Thiram with different concentrations in aqueous solution

Fig.8 Schematic diagram of the probe for the microchannel device measurement system

Fig.9 SERS spectra of Thiram with different concentrations in aqueous solutionλex=532 nm; integration time: 2 s; concentration of Thiram/(mol·L-1): a. 4.2×10-3; b. 4.2×10-4; c. 4.2×10-5; d. 4.2×10-6.

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