采用浸渍还原法制备纳米颗粒.pdf

第 38 卷第 6 期 中南大学学报( 自然科学版) Vol.38 No.6 2007 年 12 月 J. Cent. South Univ. (Science and Technology) Dec. 2007 采用浸渍−还原法在炭纤维表面制备纳米镍催化剂颗粒 廖寄乔，王占锋，周建伟 ( 中南大学 粉末冶金国家重点实验室，湖南 长沙，410083) 摘 要：为了在炭纤维表面原位生长纳米炭纤维/纳米碳管，研究它对炭/炭复合材料微观界面结构和导热性能的 影响，以硝酸镍为催化剂前驱体，H2 为还原气体，N2 为载气，采用浸渍−还原技术在炭纤维表面制备纳米 Ni 催 化剂颗粒。用扫描电镜观察 Ni 颗粒形貌和粒径，分析讨论还原温度和时间对纳米 Ni 颗粒的影响及纳米颗粒的形 成原因。研究结果表明：随着还原温度升高，Ni 颗粒逐渐变大；随着还原时间增加，催化剂前驱体涂层先分裂， 再逐渐形成纳米 Ni 颗粒，而后又因烧结变大；H2 和 N2 气在 Ni 颗粒形成过程中还起到刻蚀涂层、吸附弱化颗粒 间粘结力的作用；合成纳米Ni 颗粒的最佳工艺条件是：还原温度为 400~450 ℃，还原时间为 30~60 min 。 关键词：纳米炭纤维/纳米碳管；浸渍−还原；纳米 Ni 催化剂颗粒；炭纤维 中图分类号：TQ342.742 文献标识码：A 文章编号：1672-7207(2007)06−1033−06 Synthesis of nano nickel particles on carbon fibers by impregnation-reduction method LIAO Ji-qiao, WANG Zhan-feng, ZHOU Jian-wei (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract ：In order to grow carbon nanofibers/carbon nanotubes on carbon fibers, and further investigate their effect on the interface microstructure and thermal conductivity of C/C composites, nano Ni catalyst particles were coated on the surfaces of carbon fibers by impregnation-reduction method using Ni(NO ) as catalyst precursor, H as reduction gas and 3 2 2 N2 as carrier gas. The effects of reduction temperature and time on morphology and diameters of nano Ni particles were studied by scanning electron microscope (SEM), and the formation reasons of Ni particles were also discussed