【摘要】 采用一步化学溶液法在玻璃衬底上通过改变溶液浓度、酸碱度等影响因素生长出不同形貌和不同尺寸的ZnO棒。已生长出的ZnO棒的形貌有细长棒形,垂直于衬底的规则六角形,短而粗的六角形,橄榄形,圆头或平头对称双棒和花生米粒形。分析了酸碱度、溶液浓度、催化剂和温度对生成的ZnO样品形貌的影响,以及分析了其生长机理。随着溶液浓度的增加,生成的ZnO棒的长径比随之减小。溶液浓度为0.01 mol/L时,细棒的长径比约为20~70,而当溶液浓度为0.5 mol/L时,规则六角短棒的长径比约为0.5~1。当溶液浓度为0.1 mol/L,可以生成截面十分规则的六角形且端面为平面的棒状ZnO。随着溶液酸碱性的增强,生成的ZnO棒由细长棒(弱酸性条件)过渡到圆头短棒(弱碱性条件),溶液的碱性继续增强,可以生成橄榄形。当碱性很强时,生成颗粒状。测量了样品的XRD,扫描电镜像和光致发光光谱。更多还原

【Abstract】 ZnO is a Ⅱ-Ⅵ wide and direct band semiconductor. It has a large fundamental band gap of 3.37 (eV,)which makes it a promising material for use in ultraviolet light-emitting and laser diodes. Moreover, ZnO possesses a large exciton binding energy, which is much larger than that of GaN (25 meV) as well as the (thermal) excitation energy at room temperature (60 meV),and can ensure an efficient exciton emission at room temperature. The fabrication of one-dimensional ZnO nanostructures has also been of growing interest owing to the promising application in nanoscale optoelectronic devices. ZnO nanostructures can be fabricated by various methods such as pulse laser deposition, chemical or physical vapor deposition and thermal evaporation. However, to date, for practical (application,) low-temperature growth of well-aligned ZnO nanostructures arrays which have the well-faced hexagonal structure and controlled diameters will be required. In this work, various morphologies and different sizes of ZnO rods have been fabricated through a simple chemical solution on the glass substrates by altering pH, the concentration of solution and other factors. We analyzed in detail the in-(fluence) of the pH, concentration, catalyst and temperature on the morphology of the as-grown ZnO samples. XRD patterns of all samples indicated that ZnO is a wurtzite structure and no imputity phase was found. XRD pattern of regular hexagonal ZnO rods showed that ZnO rods mainly grew along the c-axis direction. And the photoluminescence spectrum showed that there was only a near UV emission with a peak at 368 nm, and the FWHM of the emission peak is only 45 nm.更多还原