Diamond synthesis from carbon nanofibers at low temperature and low pressure

Scientific Reports
Chengzhi LuoWenge Yang

Abstract

In this article, we report a new route to synthesize diamond by converting "solid" carbon nanofibers with a Spark Plasma Sintering system under low temperature and pressure (even at atmospheric pressure). Well-crystallized diamond crystals are obtained at the tips of the carbon nanofibers after sintering at 1500 °C and atmospheric pressure. Combining with scanning electron microscopy, transmission electron microscopy, electron-energy loss spectroscopy and Raman spectroscopy observations, we propose the conversion mechanism as follows: the disorder "solid" carbon nanofibers→well crystallined carbon nanofibers→bent graphitic sheets→onion-liked rings→diamond single crystal→the bigger congregated diamond crystal. It is believed that the plasma generated by low-voltage, vacuum spark, via a pulsed DC in Spark Plasma Sintering process, plays a critical role in the low temperature and low pressure diamond formation. This Spark Plasma Sintering process may provide a new route for diamond synthesis in an economical way to a large scale.

References

May 4, 2004·Micron : the International Research and Review Journal for Microscopy·Chunxu PanYaoyao Ren

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Citations

Jun 20, 2017·ACS Applied Materials & Interfaces·Chengzhi LuoChunxu Pan
Mar 20, 2019·Physical Chemistry Chemical Physics : PCCP·Anagh Bhaumik, Jagdish Narayan

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Methods Mentioned

BETA
electron microscopy
transmission electron microscopy
electron diffraction
X-ray

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