Catalyst-free synthesis of transparent, mesoporous diamond monoliths from periodic mesoporous carbon CMK-8.

Proceedings of the National Academy of Sciences of the United States of America
Li ZhangKai Landskron

Abstract

We report on the synthesis of optically transparent, mesoporous, monolithic diamond from periodic mesoporous carbon CMK-8 at a pressure of 21 GPa. The phase transformation is already complete at a mild synthesis temperature of 1,300 degrees C without the need of a catalyst. Surprisingly, the diamond is obtained as a mesoporous material despite the extreme pressure. X-ray diffraction, SEM, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, and Z-contrast experiments suggest that the mesoporous diamond is composed of interconnected diamond nanocrystals having diameters around 5-10 nm. The Brunauer Emmett Teller surface area was determined to be 33 m2 g(-1) according Kr sorption data. The mesostructure is diminished yet still detectable when the diamond is produced from CMK-8 at 1,600 degrees C and 21 GPa. The temperature dependence of the porosity indicates that the mesoporous diamond exists metastable and withstands transformation into a dense form at a significant rate due to its high kinetic inertness at the mild synthesis temperature. The findings point toward ultrahard porous materials with potential as mechanically highly stable membranes.

References

Feb 7, 2003·Nature·Tetsuo IrifuneHitoshi Sumiya
Oct 18, 2003·Science·Wendy L MaoRussell J Hemley
Apr 2, 2004·Nature·E A EkimovS M Stishov
Sep 14, 2004·Proceedings of the National Academy of Sciences of the United States of America·Zhongwu WangTongde Shen
Nov 14, 2008·Proceedings of the National Academy of Sciences of the United States of America·Yu-fei MengRussell J Hemley
Jun 25, 2009·Journal of the American Chemical Society·Paritosh MohantyKai Landskron

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Citations

Jul 12, 2013·Accounts of Chemical Research·Manik Mandal, Kai Landskron
May 11, 2011·Proceedings of the National Academy of Sciences of the United States of America·Peter J PauzauskieJoe H Satcher
Jul 1, 2017·Inorganic Chemistry·Li ZhangQing Yang
Aug 15, 2014·Chemical Communications : Chem Comm·Manik MandalKai Landskron

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