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Seo, Kwanyong
The SEO Group
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  • Flexible solar cell, transparent solar cell, PV-battery hybrid system, hetero-junction solar cell

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Selective removal of metallic single-walled carbon nanotubes with small diameters by using nitric and sulfuric acids

Cited 88 times inthomson ciCited 90 times inthomson ci
Title
Selective removal of metallic single-walled carbon nanotubes with small diameters by using nitric and sulfuric acids
Other Titles
Selective removal of metallic single-walled carbon nanotubes with small diameters by using nitric and sulfuric acids
Author
Yang, Cheol-MinPark, Jin SungAn, Kay HyeokLim, Seong ChuSeo, KwanyongKim, BongsooPark, Kyung AhHan, SeungwuPark, Chong YunLee, Young Hee
Keywords
RAMAN-SPECTROSCOPY; SEPARATION; FUNCTIONALIZATION; PURIFICATION; REACTIVITY
Issue Date
2005-10
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.41, pp.19242 - 19248
Abstract
Coexistence of metallic and semiconducting carbon nanotubes has often been a bottleneck in many applications and much fundamental research. Single-walled carbon nanotubes (SWCNTs) were dissolved in HNO3/H2SO4 mixture to confirm differing reactivity between metallic (in) and semiconducting (s) SWCNTs. With HNO3/H2SO4 treatment, s-SWCNTs remained intact, while m-SWCNTs were completely removed for SWCNTs with small diameters less than 1.1 nm, which was confirmed by resonant Raman and optical absorption spectra. We also showed that nitronium ions (NO2+) dissolved in the HNO3/HSO4 solution could preferably attack the m-SWCNTs, which was supported by our theoretical calculation. This clear selectivity can be explained by the preferential adsorption of positively charged NO2+ on m-SWCNTs due to more available electron densities at the Fermi level in the m-SWCNTs. We report for the first time a selective removal of small-diameter m-SWCNTs by using HNO3/H2SO4 Solution, which presented a striking contrast to the diameter-selective removal of SWCNTs by oxidative etching reported previously
URI
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DOI
10.1021/jp053245c
ISSN
1520-6106
Appears in Collections:
ECHE_Journal Papers
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