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采用532nm、632.8nm和785nm三种不同波长激光束,研制适用于各波长的TiO_2-AgNPs基底,检测罗丹明6g(R6g)和健康人血清两种样品的表面增强喇曼光谱(SERSp),并验证不同波长激光激励对SERSp指纹谱的影响.结果表明:当提拉速度达到200mm/min时,TiO_2薄膜光催化活性不再增加;在440℃~600℃范围内,TiO_2晶型均为锐钛矿结构;膜厚、温度及紫外灯照射时间共同影响银粒子生长,200mm/min提拉速度、520℃煅烧温度及紫外光照射80min条件下获得的TiO_2-AgNPs基底具有较好喇曼增强效果;不同波长激励对SERSp各谱线的增强影响明显,在532nm波长激励的SERSp中,大波数的谱峰增强因子明显高于小波数的谱峰,在785nm波长激励的SERSp中正好相反,而在632.8nm波长激励的SERSp中,大、小波数谱峰增强因子比较均一;不同波长激励样品SERSp指纹谱有明显的差异.
The surface-enhanced Raman spectra (SERSp) of two samples of rhodamine 6g (R6g) and healthy human serum were detected by using three different wavelengths of 532nm, 632.8nm and 785nm laser beams. The results showed that the photocatalytic activity of TiO 2 film did not increase when the pulling speed reached 200mm / min. The crystal form of TiO_2 was anatase in the range of 440 ℃ ~ 600 ℃, The structure of TiO_2-AgNPs obtained under the condition of 200mm / min pulling speed, 520 ℃ calcination temperature and UV irradiation for 80min has better Raman enhancement effect. The effects of different wavelength excitation on the enhancement of SERSp spectra are obvious. In the SERSp excited by 532nm wavelength, the enhancement factor of the large wave number is obviously higher than that of the wavelet, which is the opposite in the SERSp excited by the wavelength of 785nm. In the SERSp excited by nm wavelength, the peak enhancement factor of the large and small wavelet peaks is relatively uniform. The SERSp fingerprints of the excited samples at different wavelengths have obvious differences.