Journal ArticleDOI
Fermi Level Engineering of Single-Walled Carbon Nanotubes by AuCl3 Doping
Ki Kang Kim,Jung Jun Bae,Hyeon Ki Park,Soo Min Kim,Hong-Zhang Geng,Kyung Ah Park,Hyeon-Jin Shin,Seon-Mi Yoon,Anass Benayad,Jae-Young Choi,Young Hee Lee +10 more
TLDR
It is proposed that this large work function shift forces the Fermi level of the SWCNTs to be located deep in the valence band, i.e., highly degenerate, creating empty van Hove singularity states, and hence the work functionshift invokes a new asymmetric transition in the absorption spectroscopy from a deeper level to newly generated empty states.Abstract:
We investigated the modulation of optical properties of single-walled carbon nanotubes (SWCNTs) by AuCl 3 doping. The van Hove singularity transitions (E 11 (S), E 22 (S), E 11 (M)) in absorption spectroscopy disappeared gradually with an increasing doping concentration and a new peak appeared at a high doping concentration. The work function was downshifted up to 0.42 eV by a strong charge transfer from the SWCNTs to AuCl 3 by a high level of p-doping. We propose that this large work function shift forces the Fermi level of the SWCNTs to be located deep in the valence band, i.e., highly degenerate, creating empty van Hove singularity states, and hence the work function shift invokes a new asymmetric transition in the absorption spectroscopy from a deeper level to newly generated empty states.read more
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Efficient Reduction of Graphite Oxide by Sodium Borohydride and Its Effect on Electrical Conductance
Hyeon-Jin Shin,Hyeon-Jin Shin,Ki Kang Kim,Anass Benayad,Seon-Mi Yoon,Hyeon Ki Park,In‐Sun Jung,Mei Hua Jin,Hae Kyung Jeong,Jong Min Kim,Jae-Young Choi,Young Hee Lee +11 more
TL;DR: In this paper, the sheet resistance of graphite oxide film reduced using sodium borohydride (NaBH4) is much lower than that of films reduced using hydrazine (N2H4).
Journal ArticleDOI
Electrical Detection of DNA Hybridization with Single-Base Specificity Using Transistors Based on CVD-Grown Graphene Sheets
TL;DR: This research presents a novel and scalable approach to integrated materials engineering that addresses the challenge of integrating nanofiltration and desorption in the low-tech environment.
Journal ArticleDOI
Enhancing the conductivity of transparent graphene films via doping
TL;DR: The p-type doping behavior was confirmed by characterizing the Raman G-band of the doped graphene film and the doping effect was manifested only with 1-2 layer graphene but not with multi-layer graphene, advancing the numerous applications of graphene films as transparent conducting electrodes.
Journal ArticleDOI
Graphdiyne Oxides as Excellent Substrate for Electroless Deposition of Pd Clusters with High Catalytic Activity
TL;DR: Graphdiyne (GDY), a novel kind of two-dimensional carbon allotrope consisting of sp- and sp(2)-hybridized carbon atoms, is found to be able to serve as the reducing agent and stabilizer for electroless deposition of highly dispersed Pd nanoparticles owing to its low reduction potential and highly conjugated electronic structure.
Journal ArticleDOI
Layer-by-layer doping of few-layer graphene film.
Fethullah Güneş,Hyeon-Jin Shin,Hyeon-Jin Shin,Chandan Biswas,Gang Hee Han,Eun Sung Kim,Seung Jin Chae,Jae-Young Choi,Young Hee Lee +8 more
TL;DR: The sample shows better environmental stability due to the presence of dominant neutral Au atoms on the surface which was confirmed by angle-resolved X-ray photoelectron spectroscopy, which meets the technical target for industrial applications.
References
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Journal ArticleDOI
Raman spectroscopy of carbon nanotubes
TL;DR: The use of Raman spectroscopy to reveal the remarkable structure and the unusual electronic and phonon properties of single wall carbon nanotubes (SWNTs) is reviewed comprehensively in this article.
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Single- and multi-wall carbon nanotube field-effect transistors
TL;DR: In this article, the authors fabricated field effect transistors based on individual single and multi-wall carbon nanotubes and analyzed their performance, showing that structural deformations can make them operate as field-effect transistors.
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Extreme oxygen sensitivity of electronic properties of carbon nanotubes
TL;DR: The results, although demonstrating that nanotubes could find use as sensitive chemical gas sensors, likewise indicate that many supposedly intrinsic properties measured on as-prepared nanotube may be severely compromised by extrinsic air exposure effects.
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Electronic structure of chiral graphene tubules
TL;DR: In this paper, the electronic structure for graphenemonolayer tubules is predicted as a function of the diameter and helicity of the constituent graphene tubules, and it is shown that approximately 1/3 of these tubules are a one-dimensional metal which is stable against a Peierls distortion, and the other 2/3 are onedimensional semiconductors.
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Synthesis of individual single-walled carbon nanotubes on patterned silicon wafers
TL;DR: In this article, a strategy for making high-quality individual carbon nanotubes on silicon wafers patterned with micrometre-scale islands of catalytic material is described.