Can I read Sol–gel preparation of Ge nanocrystals embedded in SiO2 glasses on EtoBox?

Sol–gel preparation of Ge nanocrystals embedded in SiO2 glasses by Heqing Yang; Xingjun Wang; Huazhong Shi; Fujian Wang; Xiaoxiao Gu; Xi Yao is a Engineering article available to read on EtoBox.

What is Sol–gel preparation of Ge nanocrystals embedded in SiO2 glasses about?

Ge nanocrystals embedded in SiO 2 glasses were prepared by an easy sol-gel method. The gels synthesized through hydrolysis of Si(OC 2 H 5 ) 4 and 3-trichloro-germaniumpropanoic acid (Cl 3 -Ge-C 2 H 4 -COOH) were heated at 6001C for 10 h in air atmosphere to form GeO 2 -SiO 2 glasses. The gel-glasses were further heated at 500-7001C in H 2 gas atmosphere, in which Ge 4+ were reduced to precipitate cubic Ge nanocrystals. The size of Ge crystals is estimated to be from 1 to 13 nm according to the XRD and TEM. The optical absorption edge shifts to higher energy with decrease in the content of Ge in the starting materials, and in the heating temperature and time in H 2 gas atmosphere. This phenomenon is interpreted in terms of a quantum confinement effect of electrons and holes in the Ge nanocrystals.

Who reads Sol–gel preparation of Ge nanocrystals embedded in SiO2 glasses?

Author

Heqing Yang; Xingjun Wang; Huazhong Shi; Fujian Wang; Xiaoxiao Gu; Xi Yao

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-0248)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)