以天然气为碳源，氢气为载气，通过无催化化学气相沉积的方法，合成不同粒径的球形炭。研究了沉积温度、压力和气体比例对化学气相沉积球形炭的影响。用X射线衍射、扫描电子显微镜和透射电子显微镜对实验结果进行表征。研究结果表明制备纳米球形炭(50~100 nm)的优化工艺为沉积温度1150℃、沉积压力5 kPa和天然气/氢气(气体流量比)1：4。本研究对球形炭的气相沉积机理进行了详细的研究。沉积温度对球形炭的尺寸和微结构影响较小，沉积压力对炭核的碰撞几率影响较大。另外，氢在炭形核过程中起来很重要的作用，氢的存在有效的较少了炭核的碰撞几率。
Carbon spheres with different sizes were prepared by non-catalytic chemical vapor deposition fromgas mixtures of CH4 and H2 . The influence of the deposition temperature, pressure, and gas ratio on the formation and growth mechanism of the spheres was investigated. The carbon spheres obtained were characterized by XRD, SEM and TEM. Results indicated that carbon nanosph-eres (50-100 nm) could be obtained at 1 150℃ and 5 kPa from a gas mixture with a CH4/H2 volume ratio of 0. 25. The deposition temperature had no obvious effect on the sphere size and structure. The sphere size increased with the deposition pressure and the gas ratio. A model was proposed to elucidate their formation and growth.
参考文献
| [1] | Chen, Shouhui;Wu, Jiafeng;Zhou, Rihui;Zuo, Li;Li, Ping;Song, Yonghai;Wang, Li.Porous Carbon Spheres Doped with Fe3C as an Anode for High-Rate Lithium-ion Batteries[J].Electrochimica Acta,2015:78-85. |
| [2] | Sinha AK.;Hwang LP.;Hwang DW..A novel approach to bulk synthesis of carbon nanotubes filled with metal by a catalytic chemical vapor deposition method[J].Chemical Physics Letters,20005-6(5-6):455-460. |
| [3] | Benzinger W.;Huttinger K.J..Chemistry and kinetics of chemical vapor infiltration of pyrocarbon-IV. Investigation of methane/hydrogen mixtures[J].Carbon: An International Journal Sponsored by the American Carbon Society,19996(6):931-940. |
| [4] | Sharon M.;Yase K.;Ijima S.;Ando Y.;Zhao XL.;Mukhopadhyay K..Spongy carbon nanobeads - A new material[J].Carbon: An International Journal Sponsored by the American Carbon Society,19985/6(5/6):507-511. |
| [5] | M. Inagaki;V. Vignal;H. Konno.Effects of carbonization atmosphere and subsequent oxidation on pore structure of carbon spheres observed by scanning tunneling microscopy[J].Journal of Materials Research,19997(7):3152-3157. |
| [6] | Gang Hu;Ding Ma;Mojie Cheng;Lin Liu;Xinhe Bao.Direct synthesis of uniform hollow carbon spheres by a self-assembly template approach[J].Chemical communications,200217(17):1948-1949. |
| [7] | Jianwei Liu;Mingwang Shao;Qun Tang.A medial-reduction route to hollow carbon spheres[J].Carbon: An International Journal Sponsored by the American Carbon Society,20038(8):1682-1685. |
| [8] | Xiaogang Yang;Cun Li;Wei Wang;Baojun Yang;Shuyuan Zhang;Yitai Qian.A chemical route from PTFE to amorphous carbon nanospheres in supercritical water[J].Chemical communications,20043(3):342-343. |
| [9] | Jian-Ying Miao;Dennis W.Hwang;Kuppala V.Narasimhulu;Ping-I Lin;Yit-Tsong Chen;Sheng-Hsien Lin;Lian-Pin Hwang.Synthesis and properties of carbon nanospheres grown by CVD using Kaolin supported transition metal catalysts[J].Carbon: An International Journal Sponsored by the American Carbon Society,20044(4):813-822. |
| [10] | Michio Inagaki.Carbon materials Structure, texture and intercalation[J].Solid state ionics,19961(1):833-839. |
| [11] | Xingmei Guo;Haixing Liu;Yinghua Shen;Mei Niu;Yongzhen Yang;Xuguang Liu.Theoretical and experimental studies on silica-coated carbon spheres composites[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013Oct.15(Oct.15):215-221. |
| [12] | Xin Zhao;Wei Li;Shou-Xin Liu.Coupled soft-template/hydrothermal process synthesis of mesoporous carbon spheres from liquefied larch sawdust[J].Materials Letters,2013Sep.15(Sep.15):5-8. |
| [13] | A. Govindaraj;Rahul Sen;B. Venkata Nagaraju;C. N. R. Rao.Carbon nanospheres and tubules obtained by the pyrolysis of hydrocarbons[J].Philosophical Magazine Letters,19975(5):363-367. |
| [14] | Vilas Ganpat Pol;Menachem Motiei;Aharon Gedanken.Carbon spherules: synthesis, properties and mechanistic elucidation[J].Carbon: An International Journal Sponsored by the American Carbon Society,20041(1):111-116. |
| [15] | Hai-sheng Qian;Feng-mei Han;Bing Zhang.Non-catalytic CVD preparation of carbon spheres with a specific size[J].Carbon: An International Journal Sponsored by the American Carbon Society,20044(4):761-766. |
| [16] | Vilas Ganpat Pol;Swai Vilas Pol;Jose M. Calderon Moreno.High yield one-step synthesis of carbon spheres produced by dissociating individual' hydrocarbons at their autogenic pressure at low temperatures[J].Carbon: An International Journal Sponsored by the American Carbon Society,200615(15):3285-3292. |
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