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Structural and electrical properties of carbon-ion-implanted ultrananocrystalline diamond films

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journal contribution
posted on 2019-05-14, 13:23 authored by H Xu, J Liu, H Ye, D Coathup, AV Khomich, X Hu
We investigate the structural and electrical properties of carbon-ion-implanted ultrananocrystalline diamond (UNCD) films. Impedance spectroscopy measurements show that the impedance of diamond grains is relatively stable, while that of grain boundaries (GBs) (R b) significantly increases after the C+ implantation, and decreases with the increase in the annealing temperature (T a) from 650 °C to 1000 °C. This implies that the C+ implantation has a more significant impact on the conductivity of GBs. Conductive atomic force microscopy demonstrates that the number of conductive sites increases in GB regions at T a above 900 °C, owing to the formation of a nanographitic phase confirmed by high-resolution transmission electronic microscopy. Visible-light Raman spectra show that resistive trans-polyacetylene oligomers desorb from GBs at T a above 900 °C, which leads to lower R b of samples annealed at 900 and 1000 °C. With the increase in T a to 1000 °C, diamond grains become smaller with longer GBs modified by a more ordered nanographitic phase, supplying more conductive sites and leading to a lower R b.

Funding

Project supported by the National Natural Science Foundation of China (Grant Nos. 50972129 and 50602039), the International Science Technology Cooperation Program of China (Grant No. 2014DFR51160), the National Key Research and Development Program of China (Grant No. 2016YFE0133200), European Unio's Horizon 2020 Research and Innovation Staff Exchange (RISE) Scheme (Grant No. 734578), One Belt and One Road International Cooperation Project from the Key Research and Development Program of Zhejiang Province, China (Grant No. 2018C04021), and Xinmiao Talents Program of Zhejiang Province, China (Grant No. 2017R403078).

History

Citation

Chinese Physics B, 2018, 27 (9), pp. 096104-1-096104-8 (8)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

  • AM (Accepted Manuscript)

Published in

Chinese Physics B

Publisher

IOP Publishing

issn

1000-3290

Acceptance date

2018-08-10

Copyright date

2018

Available date

2019-08-10

Publisher version

https://iopscience.iop.org/article/10.1088/1674-1056/27/9/096104/meta

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en

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