【作者】 王翠英；

【Author】 WANG Cui-ying Xiamen University and Powerlong Battery Research Institute. Inc., Department of Chemistry, Xiamen, 361005, China

【机构】 厦门大学化学系厦大宝龙电池研究所；

【摘要】 采用紫外光辅照还原法新技术制备了Pd-TiO₂纳米复合粒子.利用紫外光还原含有TiO₂胶体悬浮液的PdCl₄ （2-）溶液,形成核-壳式结构的Pd-TiO₂纳米复合粒子。对不含有TiO₂胶体的PdCl₄^2-溶液和含有TiO₂胶体的PdCl₄^2-溶液进行一定时间光还原后的样品及纯的TiO₂胶体悬浮液进行紫外可见吸收光谱分析得出核-壳式结构的Pd-TiO₂纳米复合粒子的形成使Pd和TiO₂之间发生了相互作用,Pd-TiO₂纳米复合粒子中金属钯的吸收峰位置蓝移了约80nm,TiO₂的紫外可见吸收峰的峰形展宽和加强,并红移了35nm,使TiO₂的光电化学活性大大提高。TEM分析得出所得产物为粒径分布均匀的平均粒子约10nm的球形纳米材料。由TiO₂和经Pd修饰所得Pd-TiO₂纳米复合粒子的Raman光谱分析得出:经贵金属钯修饰复合过的TiO₂表现出明显的拉曼增强效应（SERS）.更多还原

【Abstract】 The Pd-TiO₂ nanocomposite particles with the size about 10nm were synthesized by photoreduction ofPdCl₄^2- solution in the presence of TiO₂ transparent colloid suspension. The characterization were operated usingoptical absorption spectra, XRD, TEM and Raman spectra technique. The comparison of the Pd absorption spectrashowed that the presence of TiO₂ during the photoreduction accelerated the formation of Pd colloid, and the peakposition of Pd colloid was greatly blue-shift 80nm from 420nm to 340nm. The comparison of the TO₂ absorptionspectra showed that the modification by the noble metal Pd made the absorption peak of TiO₂ broadening,Strengthening and red-shift 35nm, which meaned that the photoelectrochemical activity of the semiconductor TiO₂ wasimproved greatly The TEM micrograph showed that the composite particle. size was well-distributed and about 10nm.The XRD pattern showed the phase composition of the composite particles. The Raman spectra illustrated the greatSERS of the TiO₂ due to the modification of the noble metal Pd.更多还原