Son Byung-Koo, Lee Kyu-Hang, Kim Tae-Hee, Shin Myung-Sun, Choi Sun-Yong, Cho Guangsup
Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Korea.
Division of Plasma Convergence R&BD, Cheorwon Plasma Research Institute, Cheorwon 24047, Korea.
Nanomaterials (Basel). 2019 Jul 10;9(7):995. doi: 10.3390/nano9070995.
A mixture of nanothin exfoliated (NTE) graphite and urea (CO(NH)) powder was treated with radio frequency (RF) thermal plasma to achieve in situ purification and nitrogen doping of NTE graphite using the high-temperature flame of the RF plasma. Reactive species such as NH, NH, and HCNO generated by the thermolysis of urea play an important role in the purification and nitrogen doping of NTE graphite. The nitrogen content of NTE graphite subjected to plasma treatment increased by 5 times compared with that of raw NTE graphite. Three types of nitrogen species, namely, quaternary N, pyridinic N, and pyrrolic N, were observed after N doping with plasma treatment. The sheet resistance of N-doped NTE graphite reduced to 12-21% compared to that of the untreated NTE graphite, with the corresponding resistivity being ~7 × 10 Ω m.
将纳米薄片状剥离石墨（NTE）与尿素（CO(NH₂)₂）粉末的混合物用射频（RF）热等离子体处理，利用RF等离子体的高温火焰实现NTE石墨的原位纯化和氮掺杂。尿素热解产生的诸如NH₃、NH₂和HCNO等活性物种在NTE石墨的纯化和氮掺杂中起重要作用。经过等离子体处理的NTE石墨的氮含量与原始NTE石墨相比增加了5倍。等离子体处理氮掺杂后观察到三种氮物种，即季氮、吡啶氮和吡咯氮。与未处理的NTE石墨相比，氮掺杂的NTE石墨的薄层电阻降低到12% - 21%，相应的电阻率约为7×10⁻⁵Ω·m。
