水浴法制备形貌可控的一维ZnO纳米和微米棒

用一步或两步简单的化学溶液法,以醋酸锌为原料,六亚甲基四胺或三乙醇胺为催化剂在玻璃衬底上生长出不同形貌的纳米和微米ZnO棒.探讨了反应液的酸碱度和反应液浓度对生成的ZnO棒形貌的影响,并分析了其生长机制.随着溶液浓度的增加,棒的长度与直径比减小,同时玻璃衬底上生长的ZnO棒从无序分布趋于垂直于衬底平行取向分布.随着pH值的改变,棒的形状由在弱酸性溶液中的细长棒状变为在弱碱性溶液中的圆头对称短棒;当碱性增大到一定程度时,可以生成颗粒状.通过控制一定的酸碱度和溶液浓度,可以得到规则的六角ZnO棒状阵列.测量了样品的XRD和扫描电镜像,并对其发光性能进行了测量分析.其中规则有序六角棒的发光光谱表明峰值在530nm,半高宽为220nm,可能是Vo 的电子和价带中的空穴辐射复合所致.

Solution Growth of Morphology Controllable ZnO One-Dimensional Nanorods and Microrods

Various morphologies and different sized ZnO nanorods and microrods are synthesized onto glass substrates through a low-temperature,environmental benign,solution-based growth method by the source of zinc acetate and catalysts of hexamethylene tetramine or triethanolamine.The influence of the pH values and the concentration on the morphology of as-grown ZnO rods is discussed and the growth habits is analyzed.With increasing the concentration,the ratio of length to diameter gets small and the distribution of ZnO rods on the glass substrate changes from out of order to distribution along the growth axis c.When the pH value is from weak acid to weak alkali,the shape of ZnO samples gets from the long column to short one-pair rods grown symmetrically from one center to both sides.With the pH values further increasing,it can be grain.Regular hexagonal ZnO rods arrays can be fabricated by the control of certain pH and concentration of the solution.XRD,SEM, and PL are used to analyze the structure,morphology, and optical properties.The PL spectrum of the regular hexagonal ZnO rods shows that there is a broad green band with a peak at 530nm and a FWHM of 220nm.The green emission is attributed to the recombination of an electron in Vo+ to a hole in VB.