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联合红外、拉曼光谱及其在金/银核-壳粒子上的表面增强拉曼散射(SERS)光谱表征了乐果和氧化乐果两种乐果类似物,归属并分析了两乐果类似物中P=S与P=O的不同而引起的振动模式,峰位变化及其酸碱影响.振动光谱显示,ν(P=O),ν(P=S)分别在690,650cm-1附近,两分子结构中对应的ν(NH),νs(CH2),ν(C—O),ν(O=C—N)II,ν(S—CH2)振动峰位中差异显著,但νas(CH3),ν(P—O—C),ν(O=C—N)I,δ(CH3),ν(C—C),ν(C—C=O)则基本对应.在金/银核-壳粒子基底上,进一步探讨了两乐果类似物中各基团在不同浓度,pH值及酸、碱水解历程条件下的SERS变化规律,并运用SERS机理并结合TEM初步阐述了两乐果类似物在金/银核-壳粒子表面的吸附状态.
Combined with infrared and Raman spectra and their surface-enhanced Raman scattering (SERS) spectra on gold / silver core-shell particles, two dimethoate analogues of dimethoate and omethoate were characterized and assigned to the two dimethoate analogues (P = O) and ν (P = S) in the vicinity of 690 and 650 cm-1, respectively, due to the difference of P = S and P = (V), V (C-O), V (O = C-N) II and V (S-CH2) (CH3), (P-O-C), ν (O = C-N) I, δ (CH3), ν (C-C) and ν (C-C = O) On the core-shell particle substrate, we further discussed the SERS variation of each group in the two dimethoate analogues under different concentrations, pH value and acid and alkali hydrolysis history. The SERS mechanism and TEM The adsorption of fructose analogues on gold / silver core-shell particles.