Formation of Ge−S Bonds from AOT-Coated GeO<SUB>2</SUB> Nanoparticles at High Temperature: An in Situ Heating EXAFS Investigation

Chem. Mater., 20 (8), 2757–2762, 2008. 10.1021/cm703368u
Web Release Date: March 20, 2008

Formation of Ge−S Bonds from AOT-Coated GeO₂ Nanoparticles at High Temperature: An in Situ Heating EXAFS Investigation

Xing Chen,^†^‡ Quan Cai,^†^§ Wei Wang,^†^§ Guang Mo,^†^§ Longsheng Jiang,^†^§ Kunhao Zhang,^†^§ Zhongjun Chen,^† Ziyu Wu,^†^§ and Zhonghua Wu^*^†^§

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, CAS, Beijing 100049, China, General Research Institute for Nonforrous Metals, Beijing 100088, China, and Graduate School of the Chinese Academy of Sciences, Beijing 100864, China

Received November 27, 2007

Revised Manuscript Received January 24, 2008

Abstract:

Cubic germanium dioxide (GeO₂) nanoparticles coated by sodium bis(2-ethylhexyl) sulfosuccinate (AOT) were synthesized with a reverse micelle technique. In situ heating extended X-ray absorption fine-structure technique was used to investigate the change of the local atomic structure and electronic structure around germanium. A direct formation of Ge−S bond was found from GeO₂ at high temperature and ambient pressure. This Ge−S bond was identified to be temperature-dependent. The change of the local structure with heating is discussed. This study provides a routine process to synthesize GeS₂ from GeO₂ at higher temperature and ambient pressure.

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