题目：

Structural evolution of reduced GeO_x nanoparticles

作者：

John A. McLeod,^*Jia Zhao, Linju Yang, Yi Liu and Lijia Liu^*

单位：

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratoryfor Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu, 215123, China

摘要：

GeO_x nanoparticles (NPs) are of growing interest in lithium storage and optoelectronics. GeO_x NPs prepared by chemical reduction, exposed to air or retained under N₂, then annealed under H₂at varioustemperatures are studied herein using soft X-ray spectroscopy. We find that fresh and air-exposed GeO_x NPs evolve rather differently under annealing. The fresh GeO_x NPs start as a very amorphous heterogeneous mixture of GeO_x and Ge, and during annealing both the valence band and conductionband edges evolve. In contrast, the air-exposed GeO_x NPs initially contain quartz-phase GeO₂, andduring annealing only the conduction band edge evolves due to increased oxygen vacancies formingunoccupied defect states (the valence band does not change until annealing at high temperature, at which point almost all of the GeO₂ is removed). These findings suggest a preparation and annealingstrategy that could be used to tailor GeO_x NPs for their intended use in lithium storage oroptoelectronic applications.

影响因子：

4.449

分区情况：

二区

链接：

http://sci-hub.cc/10.1039/c6cp07354a

责任编辑：向丹婷  联系方式：dtxiang@suda.edu.cn