ZnO一维纳米结构的形貌调控与亲疏水性研究

分别使用金属、半导体等类型的基片作沉积衬底,采用气相沉积的方法合成了多种ZnO一维纳米结构,如塔状结构、锥状结构、蘑菇状结构、环状结构等等.用扫描电镜,透射电镜等对合成产物的形貌和结构进行了研究,结果发现沉积衬底对合成产物形貌和结构有着重要的影响.同时对合成塔状纳米结构的生长机理做了系统地分析,并研究了其相应的亲疏水性能. 关键词： 纳米结构 气相沉积 形貌调控 结构表征     

ZnSb2O4纳米正三角形的合成与生长机理讨论

以混合的ZnO粉和金属Sb作为前驱物,通过化学气相沉积方法在Si衬底上合成了ZnSb2O4纳米正三角形.利用场发射扫描电子显微镜、透射电子显微镜以及附带的能谱仪对它们的结构和成分进行了表征.并对ZnSb2O4纳米正三角形的生长机理进行了讨论.     

ZnO microbowls grown on an ITO glass substrate through thermal evaporation

Novel ZnO microbowls are successfully synthesized by the thermal evaporating of a mixture of ZnS powder and Zn powder. The morphologies of the as-synthesized products can be adjusted by changing the temperature and the type of substrate. The morphologies, microstructures, and photoluminescence properties are investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscope, and photoluminescence spectroscopy respectively. The growth mechanism of the as-synthesized ZnO microbowls is proposed based on the experimental results. ZnO microbowls presented here can be used as building blocks to fabricate optical and optoelectronic micro/nano devices.     

ZnO microbowls grown on ITO glass substrate through thermal evaporation

Novel ZnO microbowls are successfully synthesized by thermal evaporating of a mixture of ZnS powder and Zn powder. The morphologies of the as-synthesized products can be adjusted by changing the temperature and the type of substrate. The morphologies, microstructures, and photoluminescence properties are investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscope, and photoluminescence spectroscopy respectively. The growth mechanism of the as-synthesized ZnO microbowls is proposed based on the experimental results. ZnO microbowls presented here can be used as building blocks to fabricate optical and optoelectronic micro/nano devices.     

被介质包围的非线性弹性杆波动方程的精确解

应用推广的tanh函数方法对被介质包围的非线性弹性杆波动方程进行了求解．得到了该方程的精确孤波解,对部分结果通过数值模拟得到了解的图像．本文获得的结果完善了相关文献已有的研究成果．从求解过程可以看出,推广的tanh函数方法是一种简便有效的方法,可用于求解其它非线性方程或方程组．     

ZnS微米花的水热合成及光催化性质研究

本文采用简便的水热法一步合成ZnS微米花,通过X射线衍射仪、扫描电子显微镜等表征手段研究了合成产物的形貌及微观结构,并考察了合成产物的光催化性质。合成产物的光催化测试结果表明,在紫外光辐照下,产物对亚甲基蓝、甲基橙和曙红都有很好的降解效果。为了测试产物循环利用的光催化能力,对其进行了5次降解实验,结果显示产物依然保持良好的光催化活性。     

弯曲表面上ZnO 亚微米棒阵列的制备

以ZnS和金属Zn粉末混合物为蒸发源以及金属Zn片为衬底,利用热蒸发气相沉积方法,在弯曲的金属Zn微球表面上,成功地获得了ZnO亚微米棒阵列结构。场发射扫描电镜研究表明:在弯曲的Zn微球表面,能自组织地生长出大量的截面为六边形的ZnO亚微米棒,这些亚微米棒的平均直径为500nm,长约1μm。棒的顶部是平滑的。能量散射X射线谱结果表明:合成的产品只存在Zn和O两种元素,其成分比例接近1∶1。没有观察到S元素。光致发射(PL)光谱显示:在387nm紫外波长处,出现一个强的半峰全宽为16nm的窄发光峰,可归属于ZnO的近带边发光,而509nm左右较弱的宽峰则源于界面缺陷态发光。这些研究结果说明我们所合成的这种ZnO亚微米棒阵列材料在紫外受激发射器件方面有着潜在的应用价值。     

Spontaneous formation of single crystal ZnO nanohelices

This paper reports a novel helix-like ZnO nanostructure with several tens of nanometres in thickness synthesized on a gold-coated Si substrate by thermal evaporation of zinc sulfide powder at 1020°C. Transmission electron microscope characterization shows that as-synthesized ZnO nanohelices extend along [01\bar 11] direction and the axial direction of the helix is along [0001] direction. A catalyst-intervened dislocation-induced growth mechanism has been suggested to explain the formation of the helix-like ZnO nanostructures. This study opens a new route to construct helix-like ZnO nanostructures by different evaporation sources.     

Temperature-Controllable Preparation of ZnS Nanosaws on Si Substrate

A large number of ZnS nanosaws are synthesized on Si substrates in the presence of Au catalyst by thermally evaporating ZnS powder. Morphologies and structures of thus-grown ZnS nanosaws are characterized by a field emission scanning electron microscopy （FE-SEM） and a transmission electron microscopy （TEM）. The results show that temperature of the Si substrates used for collection of the products is a critical experimental parameter for the formation of ZnS nanostruetures with different morphologies. The growth mechanism of the ZnS nanosaws is discussed on the basis of the experimental findings.