Research Institute of Photocatalysis, Fujian Provincial Key Laboratory of Photocatalysis, Fuzhou University, Fujian 350002, People's Republic of China.
Inorg Chem. 2013 Jun 17;52(12):6916-22. doi: 10.1021/ic302698z. Epub 2013 May 28.
Well-defined Zn2GeO4 hexagonal nanorods and nanofibers with high aspect ratios have been readily realized in high yield via a simple and general hydrothermal synthesis method free of any surfactant or template. Field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), powder X-ray diffraction (XRD), and ultraviolet-visible light diffuse reflectance spectroscopy (UV-vis DRS) revealed a unique hexagonal-prism-shaped one-dimensional (1-D) structure, surface features, anisotropic crystal growth, and crystal phase of Zn2GeO4. Detailed investigations indicated that the prismatic Zn2GeO4 nanocrystals are uniform single crystal with the longitudinal direction along the [001] and were dominated by (110) and (110) surfaces. The addition of increasing amounts of NaOH was found to facilitate the morphology transition from a hexagonal nanorod shape to a hexagonal fiber shape. As an important wide-band-gap photocatalyst, the products of regular Zn2GeO4 nanocrystals with a hexagonal 1-D structure exhibit superior photocatalytic activities for the photocatalytic decomposition of water-methanol solution to hydrogen under UV irradiation.
高纯度、形貌均一的 Zn2GeO4 六方纳米棒和纳米纤维在没有表面活性剂和模板的情况下，通过简单的水热法大量合成。场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、能谱（EDX）、粉末 X 射线衍射（XRD）和紫外-可见漫反射光谱（UV-vis DRS）揭示了 Zn2GeO4 独特的六方柱状一维（1-D）结构、表面特性、各向异性晶体生长和晶体相。详细的研究表明，棱柱形 Zn2GeO4 纳米晶是具有[001]取向的均匀单晶，主要由（110）和（110）面组成。随着 NaOH 添加量的增加，形貌从六方纳米棒形状向六方纤维形状转变。作为一种重要的宽带隙光催化剂，具有规则六方 1-D 结构的 Zn2GeO4 纳米晶产品在紫外光照射下对甲醇-水混合溶液的光催化分解为氢气表现出优异的光催化活性。
