【摘要】 通过表面增强拉曼散射研究了胞嘧啶、胸腺嘧啶和尿嘧啶在粗糙银电极表面上的吸附形态随电极电位的变化关系。大量的结构信息可从丰富的表面拉曼信号及其随电极电位相应的变化而获得。分析表明在电极电位负移过程中,胞嘧啶一直通过N 3位垂直吸附于纳米银颗粒表面;而胸腺嘧啶分子和尿嘧啶分子在表面的吸附状态都随电位改变发生了变化,较正电位下,胸腺嘧啶分子基本上以环平行于银电极表面吸附,而尿嘧啶分子通过N 3和C 2O 7团簇垂直吸附在银电极表面,较负电位下,胸腺嘧啶分子以N 1—C 2O 7半簇垂直于电极表面吸附,而尿嘧啶分子以O 7垂直吸附在银电极表面。更多还原

【Abstract】 The adsorption distributions of three nucleic acid bases(cytosine,thymine,uracil) on silver electrodes surface were investigated by surface enhanced Raman scattering(SERS) along with change relationship of electrode potential.The much structure information was obtained from abundant surface Raman signal and change of signal along with electrode potential.The cytosine may keep the adsorbed condition perpendicularly via the N3-end on the silver electrode surface in the negative move process of electrode potential.While the surface adsorption conditions of thymine and uracil changed with potential change.At positive potential,thymine lies parallel the silver electrode via ring plane,and uracil is perpendicularly standing on the silver electrode through N3 and C2O7,at negative potential,the former is perpendicularly standing on the silver electrode via N1-C2O7 and the later is perpendicularly standing on the silver electrode adsorbed via O7.更多还原