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本文中,对吸附于纳米磷化镓(GaP)粉体表面的碱性品红拉曼光谱进行了研究。通过将吸附碱性品红与纯碱性品红晶体样品的拉曼光谱进行对比、分析可知,碱性品红在纳米GaP粉体表面发生了化学吸附。在吸附碱性品红样品的拉曼光谱中,位于1200~1320cm-1范围内的光谱特征表明可能有新的化学键(P-O-C+或Ga-O-C+)形成。碱性品红分子的中央碳正离子(C+)与GaP表面具有孤对电子的氧原子形成配位键。红外光谱结果表明,氧原子与纳米GaP粉体表面的磷原子或镓原子键合,以P-O,Ga-O或P-O-Ga形式存在于GaP表面。碱性品红分子的呼吸振动,N-苯环伸缩振动,以及苯环C-C伸缩振动散射强度与纯碱性品红晶体样品相比皆有所增强。N-苯环伸缩振动散射强度增加意味着N原子是除C+离子以外的另一个可以与GaP表面发生化学作用的活性中心,这种化学作用是由N原子与GaP表面存在共轭效应造成的。
In this paper, the basic magenta Raman spectra adsorbed on the surface of GaP powders were studied. By comparing the Raman spectra of the adsorbed basic fuchsine and the pure basic fuchsine crystals, we can see that the basic fuchsine is chemisorbed on the surface of the nano-GaP powder. In the Raman spectrum of the adsorbed basic fuchsine samples, spectral features in the range of 1200-1320 cm-1 indicate the possible formation of new chemical bonds (P-O-C + or Ga-O-C +). The central carbenoid (C +) of a basic fuchsine molecule forms a coordinate bond with an oxygen atom with a lone pair of electrons on the surface of the GaP. The results of FTIR showed that the oxygen atoms were bonded to the phosphorus atom or gallium atom on the surface of the nano-GaP powder and existed in the form of P-O, Ga-O or P-O-Ga on the GaP surface. Respiratory vibration, N-phenyl stretching vibration of basic fuchsine molecules and C-C stretching vibration scattering intensity of benzene ring all increased compared with that of pure alkaline magenta crystals. The increase in the intensity of the N-benzene ring stretching vibration means that the N atom is another active site besides C + ions that can chemically interact with the GaP surface. This chemical effect is caused by the conjugate effect between the N atom and the GaP surface.