Preparation of Ge@Organosilicon Core鈥揝hell Structures and Characterization by Solid State NMR and Other Techniques
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- 作者：Michal Eshed ; Keren Keinan-Adamsky ; Gil Goobes ; Aharon Gedanken
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：May 30, 2013
- 年：2013
- 卷：117
- 期：21
- 页码：11086-11094
- 全文大小：443K
- 年卷期：v.117,no.21(May 30, 2013)
- ISSN：1932-7455
文摘
Many core鈥搒hell materials having a protecting outer layer have lately been proposed. In such materials it is not uncommon that chemical or thermal stability issues of the core material are resolved by a proper choice of the shell material. We report here the formation of core鈥搒hell structures by pyrolysis of a mixture of tetraethyl germanium and tetramethyl silicon at 750 掳C in a simple one-step reaction without the use of catalysts under 鈥淩APET鈥?conditions. The composite product, germanium鈥揷ore/organosilicon鈥搒hell (Ge@Organosilicon), is formed in two morphologies, rods and spheroids. The rods radial distribution is rather narrow while the spheroids exhibit a broader distribution due to their tendency to agglomerate. The germanium core phase is crystalline covered by a disordered organosilicon layer. The contribution of each of the precursors to the final product is shown by selected-area EDS and solid state NMR spectroscopy and further corroborated by RAMAN, EPR, and powder X-ray diffraction analysis.