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Synthesis of Bandgap-Controlled Semiconducting Single-Walled Carbon Nanotubes
Song, Wooseok,Jeon, Cheolho,Kim, Yoo Seok,Kwon, Young Taek,Jung, Dae Sung,Jang, Sung Won,Choi, Won Chel,Park, Jin Sung,Saito, Riichiro,Park, Chong-Yun American Chemical Society 2010 ACS NANO Vol.4 No.2
<P>Bandgap-controlled semiconducting single-walled carbon nanotubes (s-SWNTs) were synthesized using a uniquely designed catalytic layer (Al<SUB>2</SUB>O<SUB>3</SUB>/Fe/Al<SUB>2</SUB>O<SUB>3</SUB>) and conventional thermal chemical vapor deposition. Homogeneously sized Fe catalytic nanoparticles were prepared on the Al<SUB>2</SUB>O<SUB>3</SUB> layer and their sizes were controlled by simply modulating the annealing time <I>via</I> 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.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-2/nn901135b/production/images/medium/nn-2009-01135b_0007.gif'></P>