Effects of microwave oxygen plasma treatments on microstructure and Ge-V photoluminescent properties of diamond particles

doi:10.1088/1674-1056/ab8db0

Abstract The microstructure and Ge-V photoluminescent properties of diamond particles treated by microwave oxygen plasma are investigated. The results show that in the first 5 min of microwave plasma treatment, graphite and disordered carbon on the surface of the particles are etched away, so that diamond with regular crystal plane, smaller lattice stress, and better crystal quality is exposed, producing a Ge-V photoluminescence (PL) intensity 4 times stronger and PL peak FWHM (full width at half maximum) value of 6.6 nm smaller than the as-deposited sample. It is observed that the cycles of ‘diamond is converted into graphite and disordered carbon, then the graphite and disordered carbon are etched’ can occur with the treatment time further increasing. During these cycles, the particle surface alternately appears smooth and rough, corresponding to the strengthening and weakening of Ge-V PL intensity, respectively, while the PL intensity is always stronger than that of the as-deposited sample. The results suggest that not only graphite but also disordered carbon weakens the Ge-V PL intensity. Our study provides a feasible way of enhancing the Ge-V PL properties and effectively controlling the surface morphology of diamond particle.

Keywords: diamond particles Ge-V center microwave oxygen plasma treatment PL enhancement

Received: 02 April 2020
Revised: 17 April 2020
Accepted manuscript online:

PACS:	81.05.ug	(Diamond)
	61.72.jn	(Color centers)
	78.55.-m	(Photoluminescence, properties and materials)

Fund: Project supported by the Key Project of the National Natural Science Foundation of China (Grant No. U1809210), the National Key Research and Development Program of China (Grant No. 2016YFE0133200), the Belt and Road Initiative International Cooperation Project from Key Research and Development Program of Zhejiang Province, China (Grant No. 2018C04021), the European Union's Horizon 2020 Research and Innovation Staff Exchange Scheme (Grant No. 734578), the Natural Science Foundation of Zhejiang Province, China (Grant No. LY18E020013), and the International Science Technology Cooperation Program, China (Grant No. 2014DFR51160).

Corresponding Authors: Xiao-Jun Hu
E-mail: huxj@zjut.edu.cn

Cite this article:

Ling-Xiao Sheng(盛凌霄), Cheng-Ke Chen(陈成克), Mei-Yan Jiang(蒋梅燕), Xiao Li(李晓), Xiao-Jun Hu(胡晓君) Effects of microwave oxygen plasma treatments on microstructure and Ge-V photoluminescent properties of diamond particles 2020 Chin. Phys. B 29 088101

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Effects of microwave oxygen plasma treatments on microstructure and Ge-V photoluminescent properties of diamond particles

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