聚乙烯吡咯烷酮与柠檬酸钠的加入量对葡萄糖还原法制备Cu_2O颗粒形貌的影响

Effects of Amount of Poly(Vinyl Pyrrolidone) and Sodium Citrate on the Shape of Cu_2O Particles Prepared by Glucose-reduction Method

利用葡萄糖与本尼迪特试剂反应制备Cu2O颗粒,以X射线衍射、扫描电镜为表征手段,研究了聚乙烯吡咯烷酮(PVP)与柠檬酸钠的加入量对Cu2O颗粒形貌的影响。结果表明,通过改变PVP量可调控Cu2O的形貌与大小,即随着PVP量的增加,Cu2O颗粒由边长约为500nm的立方体变为大小约为1μm的切角八面体再演变为大小约为2μm的八面体。研究结果还表明,在没有柠檬酸钠存在的情况下,产物是由Cu2O小纳米晶自组装而成的、大小不均的球形颗粒;柠檬酸钠的加入有助于Cu2O晶体的生长,随着柠檬酸钠加入量的增加,球形Cu2O颗粒逐渐变为大小均一的晶体。

Cu2O particles were prepared by the reaction of Benedict＇s solution with glucose,and the effect of the amount of poly（vinyl pyrrolidone）（PVP） or sodium citrate on the morphology of the as-prepared products was investigated by X-ray diffraction and scanning electron microscopy.It is found that the size and shape of Cu2O crystals can be controlled by altering the amount of PVP and with increasing the PVP amount the Cu2O crystals evolve from ca.500 nm sized cubes,to ca.1μm sized truncated octahedra,and finally to ca.2μm sized octahedra.Our results have also revealed that in the absence of sodium citrate the as-prepared products are spherical Cu2O particles self-assembled from small-sized nanocrystals and the sizes of the spherical particles are not uniform.However,when small amount of sodium citrate is added Cu2O particles with uniform sizes can be formed,and self-assembled Cu2O particles gradually evolve into perfect crystals as the amount of sodium citrate increases,indicating that sodium citrate favors the growth of Cu2O crystals.