Oxidation and reduction of nanodiamond particles in colloidal solutions by laser irradiation or radio-frequency plasma treatment |
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| Affiliation: | 1. Plasma Technology Research Center, National Fusion Research Institute, 37 Dongjangsan-ro, Gunsan-si, Jeollabuk-do 54004, Republic of Korea;2. Department of Chemistry, Kunsan National University, 558 Daehak-ro, Gunsan-si, Jeollabuk-do 54150, Republic of Korea;1. School of Materials Science and Engineering, Northwestern Polytechnical University Xian, 710072, China;2. Experimental Physics Facility, National Centre for Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan;3. Faculty of Engineering and Technology, International Islamic University, Islamabad 44000, Pakistan;4. Department of Chemistry, Hazara University, Mansehra 21300, Pakistan;1. RKDF College of Pharmacy, SRK University, Bhopal 462026, M.P., India;2. Drug Delivery and Nanotechnology Laboratory, Bhagyoday Tirth Pharmacy College, Sagar 470002, M. P., India |
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| Abstract: | Functionalized nanodiamond particles (NDs) represent carbon nanomaterial with unique properties for various applications. Here we report on a new approach to surface modification of NDs by their exposure to radio frequency (RF) plasma or laser irradiation (LI) plasma directly in aqueous solution. By using grazing angle reflectance Fourier transform infrared spectroscopy and supporting analysis by X-ray photoelectron spectroscopy, zeta-potential, and Kelvin force microscopy we show that surface chemistry of NDs produced by detonation process (DNDs) or high-pressure high-temperature process (HPHT NDs) works in different way. Moieties on as-received NDs are dominated by COOH and C OC groups due to wet chemical cleaning procedures. On DNDs, both RF and LA treatment lead to removal of sp2 shell and additional oxidation of the surface to C OC groups. On HPHT NDs the RF treatment leads to reduction of COC groups that are transformed into COH and CH moieties. Thus at least partial hydrogenation of colloidal HPHT NDs seems feasible. |
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| Keywords: | Nanodiamonds GAR-FTIR Laser RF plasma XPS Zeta-potential KPFM |
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