Synthesis of Bandgap-Controlled Semiconducting Single-Walled Carbon Nanotubes

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• 作者：Wooseok Song ; Cheolho Jeon ; Yoo Seok Kim ; Young Taek Kwon ; Dae Sung Jung ; Sung Won Jang ; Won Chel Choi ; Jin Sung Park ; Riichiro Saito ; Chong-Yun Park
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：February 23, 2010
• 年：2010
• 卷：4
• 期：2
• 页码：1012-1018
• 全文大小：452K
• 年卷期：0
• ISSN：1936-086X

文摘

Bandgap-controlled semiconducting single-walled carbon nanotubes (s-SWNTs) were synthesized using a uniquely designed catalytic layer (Al₂O₃/Fe/Al₂O₃) and conventional thermal chemical vapor deposition. Homogeneously sized Fe catalytic nanoparticles were prepared on the Al₂O₃ layer and their sizes were controlled by simply modulating the annealing time via heat-driven diffusion and subsequent evaporation of Fe at 800 °C. Transmission electron microscopy and Raman spectroscopy revealed that the synthesized SWNTs diameter was manipulated from 1.4 to 0.8 nm with an extremely narrow diameter distribution below 0.1 nm as the annealing time is increased. As a result, the bandgap of semiconducting SWNTs was successfully controlled, ranging from 0.53 to 0.83 eV, with a sufficiently narrow energy distribution, which can be applied to field-effect transistors based on SWNTs.