Chen Dennis P, Skrabalak Sara E
Department of Chemistry, Indiana University , 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States.
Inorg Chem. 2016 Apr 18;55(8):3822-8. doi: 10.1021/acs.inorgchem.5b02866. Epub 2016 Feb 3.
(Ga1-xZnx)(N1-xOx) (GZNO) particles with enhanced optical absorption were synthesized by topotactic transformation of Zn(2+)/Ga(3+) layered double hydroxides. This outcome was achieved by suppressing Zn volatilization during nitridation by maintaining a low partial pressure of O2 (pO2). Zn-rich (x > (1)/3) variants of GZNO were achieved and compared to those prepared by conventional ammonoylsis conditions. The optical absorption and structural properties of these samples were compared to those prepared in the absence of O2 by diffuse-reflectance spectroscopy and powder X-ray diffraction methods. Notably, suppression of Zn volatilization leads to smaller-band-gap materials (2.30 eV for x = 0.42 versus 2.71 eV for x = 0.21) and reduced structural defects. This synthetic route and set of characterizations provide useful structure-property studies of GZNO and potentially other oxynitrides of interest as photocatalysts.
通过锌（2+）/镓（3+）层状双氢氧化物的拓扑转化合成了具有增强光吸收性能的（Ga1-xZnx）（N1-xOx）（GZNO）颗粒。通过在氮化过程中通过保持低氧分压（pO2）来抑制锌挥发，实现了这一结果。制备了富锌（x > 1/3）的GZNO变体，并与通过传统氨解条件制备的变体进行了比较。通过漫反射光谱和粉末X射线衍射方法，将这些样品的光吸收和结构性质与在无氧条件下制备的样品进行了比较。值得注意的是，抑制锌挥发会导致带隙更小的材料（x = 0.42时为2.30 eV，而x = 0.21时为2.71 eV）以及结构缺陷减少。这种合成路线和一系列表征为GZNO以及潜在的其他作为光催化剂的氮氧化物提供了有用的结构-性能研究。
