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中文摘要：
分别利用射频溅射法和溶胶-凝胶模板法,在玻璃基板上制备45nm厚的金膜和45nm厚的SiO2介孔薄膜,用作表面等离子体共振（SPR）芯片,然后基于Kretschmann结构和共振波长测量模式构建了近红外SPR传感器。实验表明,在宽带平行光入射条件下,随着入射角度（θ）的减小,共振波长（λR）红移,折射率灵敏度（S=＆λR/n）迅速提高。在θ=8°时测得的折射率灵敏度为24241nm/RIU,是θ=15°所对应的灵敏度（2524.2nm/RIU）的9.6倍。与常规的裸金SPR传感器相比,在相同的共振波长下,SiO2介孔薄膜修饰层使得SPR共振吸收峰明显变窄,光谱分辨率升高。低浓度溶菌酶水溶液在θ=10°时测得的SPR近红外共振波长随溶菌酶浓度增大而线性红移,其斜率为＆λR/C=1.5×107 nm.L/mol,即溶菌酶浓度增加6.67×10#8mol/L能够导致共振波长红移1nm。1×10#7 mol/L Cu2＋溶液可使SPR共振波长红移3nm。
英文摘要：
An infrared surface plasmon resonance（SPR） sensor with wavelength interrogation was prepared based on Kretschmann configuration.The SPR chips were fabricated by sputtering a 45-nm gold layer on the glass substrate followed by sol-gel template synthesis of a 45-nm-thick mesoporous silica film.The experimental results indicate that with a broadband collimated incident beam both the resonance wavelength（R） and the refractive-index sensitivity（S） increase with decreasing the incident .The refractive-index sensitivity was measured as S=24241 nm/RIU at ,being 9.6 times as high as S=2524.2 nm/RIU obtained at.Compared with a conventional SPR sensor with a naked gold film,the modification of SPR chips with mesoporous silica thin films makes the resonance absorption band narrower and consequently offers a higher SPR spectrum resolution.The results measured at using low concentrations of aqueous lysozyme solutions indicate a linear dependence of the resonance wavelength on the protein concentration with a slope of implying that an increase of 6.67＊10-8 mol/L in protein concentration can causes a redshift of;For the detection of Cu2＋ ions,the results indicated that adsorption of Cu2＋ions from the ;-7 mol/L aqueous solution can make the resonance wavelength redshift 3 nm.
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