Surface-enhanced Raman Scattering-based Diquat Detection†

doi:10.7503/cjcu20150041

Abstract

Abstract:

Based on surface-enhanced raman scattering(SERS) technique, a rapid analytical method for diquat detection with silver mirror as SERS-active substrates was developed. UV-Vis spectral analysis suggest that diquat molecules can keep stable in a solution at pH≤9 and the differet pH values do not influence the SERS active substrate and the SERS result. Therefore, SERS detection can be carried out directly without any pretreatment process. The SERS results show that the characteristic peak intensity of diquat decreases when its concentration decreases. The minimum detectable concentration of the method is as low as 10^-8 mol/L. The method is easy to conduct and can realize non-destructive and rapid analysis.

Key words: Sulface-enhanced Raman scattering(SERS), 1, 1'-Ethylene-2, 2'-dipyridylium dibromide, Diquat, Silver mirror, Detection

CLC Number:

O657.37

TrendMD:

LIU Peipei, HAN Xiaoxia, ZHAO Bing, XU Weiqing, WANG Xu. Surface-enhanced Raman Scattering-based Diquat Detection^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1517.

Figures/Tables 5

Fig.1 Molecular structure of diquat

Fig.2 UV-Vis spectra of diquat solutions(10-5 mol/L) at different pH valuesThe inset shows the corresponding photographs of the diquat solutions(10-3 mol/L) at different pH values.

Fig.3 SERS spectra of diquat solutions(10-3 mol/L) under different acidic/alkali conditionsThe inset shows the relationship between Raman peak intensity at 1578 cm-1 and corresponding pH values of diquat solution.

Fig.4 SERS spectra of diquat absorbed on silver mirrorcDQ/(mol·L-1): a—f. 1×10-3, 1×10-4, 1×10-5, 1×10-6, 1×10-7, 1×10-8.

Fig.5 SERS intensity of diquat absorbed on silver mirror at 1578 cm-1The error bars in the histogram indicate standard deviations from three measurements for each sample.

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