Au–Pd catalyzed growth of carbon nanofibers mat
Au–Pd catalyzed growth of carbon nanofibers mat
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Au-Pd 催化碳纳米纤维毡的生长
DOI：
10.1016/j.matchemphys.2008.03.016
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发表时间：
2008
影响因子：
4.6
通讯作者：
J. Tamaki
中科院分区：
文献类型：
--
作者：
T. Hashishin;J. Tamaki
碳纳米纤维（CNF）垫是由Au-Pd催化剂在10kPa的C2H2、H2和Ar的气体混合物中在700℃下通过热化学气相沉积（CVD）60分钟合成的。采用精细的 Au-Pd 催化剂作为 SiO2 生长基质上的混合物来生长 CNFs 垫。通过 TEM-EDS 分析，在生长的 CNF 的顶部/内部检测到不含 Au 颗粒的细 Pd 颗粒。 Au-Pd 颗粒内的 Au 成分具有约。 1.5nm 对 CNF 的生长没有贡献。另一方面，通过控制C2H2/Ar或C2H2/H2/Ar碳源气体中的H2或Ar浓度，单个CNF的生长规模直径为5～150nm，长度小于100μm。看来Ar气加速了CNFs垫的生长，并且每个CNF的长度随着H2供应量的增加而增加。相反，H2 导致 CNF 垫生长密度降低，直径减小。 CNF的生长主要是通过Au-Pd催化剂表面乙炔的吸附和分解以及碳在其表面的沉淀来实现的。
Carbon nanofibers (CNFs) mat was synthesized from Au–Pd catalyst at 700°C for 60min in 10kPa of the gas mixture of C2H2, H2and Ar by thermal chemical vapor deposition (CVD). Fine Au–Pd catalyst as admixture on the growth substrate of SiO2was adopted for the growth of CNFs mat. Fine Pd particles without Au particles were detected at the top/inside of as-grown CNFs by TEM-EDS analysis. The Au component within Au–Pd particles with ca. 1.5nm did not contribute to the CNF growth. On the other hand, the growth scale of individual CNF was ranged from 5 to 150nm in diameter and less than 100μm in length, by controlling H2or Ar concentration in carbon source gas of C2H2/Ar or C2H2/H2/Ar. It seemed that Ar gas accelerated the growth of the CNFs mat and the length of each CNF was increased with increasing the supplying amount of H2. In contrast, H2induced the lower growth density of CNFs mat and the decrease in the diameter of those. The CNFs mainly grow through adsorption and decomposition of acetylene on the surface of Au–Pd catalyst and precipitation of carbon on the surface of those.
影响因子：
1.8
作者：
OBERLIN, A;ENDO, M;KOYAMA, T
通讯作者：
KOYAMA, T