Cu纳米粒子的光化学制备及其可逆生长-溶解现象简

采用光化学方法在五水硫酸铜（CuSO4·5 H2 O）的乙二醇溶液中制备了Cu纳米粒子，通过反应过程中的紫外可见光谱（UV-Vis）探讨了反应历程。采用扫描电镜、X射线衍射仪和能谱仪分析了产物的形貌、物相、晶体结构和化学组成，并研究了光化学法制备Cu纳米粒子的反应参数。研究结果证明了反应仅在隔绝空气，紫外光引发的条件下才能发生，发现了生成的Cu纳米粒子敞口静置时会被溶解在胶体中的氧气逐渐氧化，再次在隔绝空气的条件下用紫外光照射后，又会重新生成Cu纳米粒子的现象，并讨论了出现这一现象的原因。而加入三乙醇胺后，同样在隔绝空气，紫外复色光照射的情况下，Cu纳米粒子会优先生长在表面上，采用这种方法，在氧化铟锡（ITO）导电玻璃上制备得到了Cu纳米粒子。

Photochemical preparation of Cu nanoparticles and their reversible growth-dissolution phenomenon

The photochemical method was used to prepare copper nanoparticles from ethylene glycol solution of CuSO4 ·5H2O. Ultraviolet-visible （UV-Vis）spectroscopy was employed to monitor the process of reaction.SEM,XRD and EDX were used to characterize the morphology,phase,crystal structure and chemical composition of the product.The photochemical reaction con-ditions for the preparation of Cu nanoparticles were systematically investigated.The photochemical reaction could only be initiated by UV irradiation in an atmosphere isolated from air.The obtained Cu nanoparticles dissolved again into the colloid solution when the colloid was exposed to air.It has been proved that the dissolution of Cu nanoparticles was due to the oxidation of metal Cu by the oxygen molecules dissolved in the colloid.The dissolved Cu nanoparticles could be regenerated by UV irradiation in an atmos-phere isolated from air.The reasons for the growth-dissolution phenomenon of Cu nanoparticles were discussed.Cu nanoparticles preferentially grew on the solution/solid interface after triethanolamine was added in the reaction solution.The Cu nanoparticles modified indium tin oxide substrates were successfully obtained by photochemical deposition method using triethanolamine as the surface anchoring agent.