By means of surface enhanced Raman spectroscopy (SERS), the main molecular configurations of fuchsin basic adsorbed on the surface of gallium phosphide (GaP) nanoparticles were determined preliminarily. At 295K, 50 mg GaP was placed in an Erlenmeyer flask filled with 50 ml, 4.7 × 10-3 M and 50 ml, 4.74 × 10- 6 M aqueous fuchsin basic, respectively. The as- formed slurry in the high concentration solution was stirred for ～ 24 h, and that in the very low dilution for nearly one week. The separated and dried GaP particles were used as the specimen for Raman scattering measurements. From the analysis of the scattering intensities of both breathing mode of the entire molecule and nitrogen - phenyl stretching mode, it can be inferred that in the high concentration solution the dye molecules are adsorbed on the GaP surface adopting two main configurations, end - on and flat; but in the very low dilution the dye molecules adopting only one configuration, i.e., end - on.%利用表面增强拉曼光谱,初步确定了吸附于纳米磷化镓(GaP)粉体表面的碱性品红分子的取向.在295K时,将50 mg GaP粉体分别置于50 ml,4.7×10-3 M和50 ml,4.74×10-6 M碱性品红水溶液中.对由较高浓度溶液形成的吸附系统持续搅拌24小时;而对极稀溶液吸附系统则连续搅拌处理7天.在经过过滤、干燥处理后,吸附有染料分子的GaP粉体被直接用于碱性品红的表面拉曼光谱测试.通过对染料分子中央碳原子呼吸振动和氮-苯环伸缩振动模式的相对强度进行分析可知:在较高浓度的溶液中,染料分子主要以一种混合取向方式吸附于GaP粉体表面上,即"端基接触"和"平躺"两种方式;而在极稀溶液中,染料分子则仅以"端基接触"方式吸附于GaP粉体表面上.
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