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Citation: LIN Xiu-Mei, WANG Xiang, LIU Zheng, REN Bin. Enhanced Raman Scattering by Polystyrene Microspheres and Application for Detecting Molecules Adsorbed on Au Single Crystal Surface[J]. Acta Physico-Chimica Sinica, ;2008, 24(11): 1941-1944. doi: 10.1016/S1872-1508(08)60075-3 shu

Enhanced Raman Scattering by Polystyrene Microspheres and Application for Detecting Molecules Adsorbed on Au Single Crystal Surface

1.
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 6 August 2008
Available Online: 30 September 2008

By assembling polystyrene microsphores on a sample surface, the surface Raman signal could be enhanced. The dependence of the enhancement effect on the size of microparticles was systematically investigated and it was found that microparticles with a diameter of 3.00 μm showed the highest enhancement of ca 5 folds. By utilizing the enhancement effect of the microspheres, the surface Raman intensity of malachite green isothiocyanate (MGITC) adsorbed on Au(111) surface could be enhanced by 20 folds, indicating that thismethod could effectively improve the detection sensitivity of surface Raman spectroscopy for the adsorbed species on single crystal surface. The later signal increment corresponds to the Raman enhancement effect of nearly 3 orders of magnitude. The enhancement effect is mainly owing to the formation of nanojets when a laser is focused on the microspheres of appropriate diameter. The formation of nanojets will lead to the highly localized electromagnetic field, which will then significantly enhance the Raman process in the nanojets. The main reason for obtaining different enhancements on two types of samples was analyzed.
- Polystyrene microsphere,
- Nanojet,
- Au single crystal surface,
- Malachite green isothiocyanate,
- Enhanced Raman spectroscopy
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