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本文采用氧化还原循环处理电极首次得到Ag/0.1mol L~(-1)NH_3+0.1mol L~(-1)NH_4Cl体系中吸附在银电极上氨分子的表面增强拉曼散射(SERS)效应。按氨分子在电极表面上的吸附量为每平方厘米8×10~(15)计算,增加因子为1.2×10~5.谱峰强度及位置随电极电位改变。吸附氨分子的SERS谱与Ag(NH_3)_2~+的正常拉曼光谱类似。本文结果表明电极表面上存在Ag(δ+)络合物,它可能是SERS效应的活性中心,用这个概念可较好地解释本文实验结果。通过谱图分析给出了Ag(δ+)表面络合物的可能结构模式。
In this paper, the surface-enhanced Raman scattering (SERS) of ammonia molecules adsorbed on silver electrodes in Ag / 0.1 mol L ~ (-1) NH 3 + 0.1 mol L ~ (-1) NH 4 Cl system was firstly obtained by redox cycling. The adsorption capacity of ammonia molecules on the electrode surface is 8 × 10 ~ (15) per square centimeter, and the increasing factor is 1.2 × 10 ~ 5. The peak intensity and position change with the electrode potential. The SERS spectrum of adsorbed ammonia molecules is similar to the normal Raman spectrum of Ag (NH_3) _2 ~ +. The results show that Ag (δ +) complex exists on the surface of electrode, which may be the active center of SERS effect. This concept can be used to explain the experimental results in this paper. The possible structural modes of Ag (δ +) surface complexes are given by spectral analysis.