吸附于纳米磷化镓粉体表面碱性品红的拉曼光谱(英文)

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。

Raman Scattering by Fuchsin Basic Adsorbed on Surface of Gallium Phosphide Nanoparticles

Surface Raman spectral study of fuchsin basic on gallium phosphide (GaP) nanoparticles was carried out. Comparison of the surface spectrum and normal spectrum suggests that the dye molecules are chemically adsorbed on the surface of the GaP nanoparticles. The significant vibration changes occurring in the wavenumber region ranging from about 1200 to 1320 cm -1 seem to be indicative of the formation of a new bond, P-O-C or Ga-O-C . The central carbonium ion is an important center of interaction between the dye and GaP. The oxygen atom with one lone pair of electron on the GaP surface acts as the electron donor. These oxygen atoms are bonded with P and Ga atoms in the form of P-O, Ga-O, and P-O-Ga groups, as shown in the infrared spectra of the GaP nanoparticles. The breathing mode of the entire molecule, N-phenyl stretching and ring C-C stretching modes undergo increasing scattering intensity. The observed changes in the vibrations assigned to the N-phenyl bonds suggest that the nitrogen atom is another important center of interaction between the dye molecule and the GaP particles. An increase in the scattering intensity of N-phenyl stretching mode occurs through the conjugation to the atoms on the GaP surface.