Evaluation of bimetallic catalysts for the growth of carbon nanotube forests

被引：7

作者：

Tornatzky, Hans ^{[1
,2
]}

Hardeman, David ^{[1
]}

Esconjauregui, Santiago ^{[1
]}

D'Arsie, Lorenzo ^{[1
]}

Xie, Rongsi ^{[1
]}

Sugime, Hisashi ^{[1
]}

Yang, Junwei ^{[1
]}

Makaryan, Taron ^{[1
,3
]}

Thomsen, Christian ^{[2
]}

Robertson, John ^{[1
]}

机构：

[1] Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England

[2] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[3] Yerevan State Univ, Fac Radiophys, Yerevan 0025, Armenia

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2013年 / 250卷 / 12期

关键词：

bimetallic catalysts; carbon nanotube forests; catalytic activity; CO;

D O I：

10.1002/pssb.201300143

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We systematically study the growth of carbon nanotube forests by chemical vapor deposition using evaporated monometallic or bimetallic Ni, Co, or Fe films supported on alumina. Our results show two regimes of catalytic activity. When the total thickness of catalyst is larger than nominally 1nm, bimetallic catalysts tend to outperform the equivalent layers of a single metal, yielding taller forests of multi-walled carbon nanotubes (CNTs). In contrast, for layers thinner than approximate to 1nm, bimetallic catalysts are notably less active than individually. However, the amount of small diameter and single-walled CNTs is significantly increased. This possible transition at approximate to 1nm might be related to different catalyst composition after annealing, depending whether or not the films overlap during evaporation and alloy during catalyst formation. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2605 / 2610

页数：6

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