Journal ArticleDOI
Work Functions and Surface Functional Groups of Multiwall Carbon Nanotubes
Hiroki Ago,Thomas Kugler,Franco Cacialli,William R. Salaneck,Milo S. P. Shaffer,A. H. Windle,Richard H. Friend +6 more
TLDR
In this paper, the work function and density of states (DOS) of multiwall carbon nanotubes (MWNTs) using ultraviolet photoelectron spectroscopy (UPS) were studied.Abstract:
We have studied the work function and density of states (DOS) of multiwall carbon nanotubes (MWNTs) using ultraviolet photoelectron spectroscopy (UPS) Raw MWNTs were purified by successive sonication, centrifugation, sedimentation, and filtration processes with the aid of a nonionic surfactant The purified MWNTs showed a slightly lower work function (43 eV) than that of highly oriented pyrolytic graphite (44 eV) Effects of three different oxidative treatments, air-, oxygen plasma-, and acid-oxidation, have also been studied It was found that oxidative treatments affect the DOS of valence bands and increase the work function X-ray photoelectron spectroscopy (XPS) measurements have suggested that gas-phase treatment preferentially forms hydroxyl and carbonyl groups, while liquid-phase treatment forms carboxylic acid groups on the surface of MWNTs These surface chemical groups disrupt the π-conjugation and introduce surface dipole moments, leading to higher work functions up to 51 eV We expect the read more
Citations
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Journal ArticleDOI
Chemical oxidation of multiwalled carbon nanotubes
Vitaliy Datsyuk,M. Kalyva,Konstantinos Papagelis,John Parthenios,Dimitrios Tasis,Angeliki Siokou,Ioannis Kallitsis,Costas Galiotis +7 more
TL;DR: In this article, the effect of oxidation on the structural integrity of multiwalled carbon nanotubes through acidic (nitric acid and a mixture of sulfuric acid and hydrogen peroxide) and basic (ammonium hydroxide/hydrogen peroxide), agents has been studied.
Journal ArticleDOI
Cocatalysts for Selective Photoreduction of CO2 into Solar Fuels.
TL;DR: Various cocatalysts, such as the biomimetic, metal-based,Metal-free, and multifunctional ones, and their selectivity for CO2 photoreduction are summarized and discussed, along with the recent advances in this area.
Journal ArticleDOI
Big returns from small fibers: A review of polymer/carbon nanotube composites
TL;DR: A review of recent studies conducted on carbon nanotube/polymer composites can be found in this paper, where various processing methods for producing these nanocomposites are discussed, in particular melt mixing, solution processing and in-situ polymerization.
Journal ArticleDOI
Adsorption Mechanisms of Organic Chemicals on Carbon Nanotubes
Bo Pan,Baoshan Xing +1 more
TL;DR: This review summarizes the research progress of organic chemical adsorption on CNTs, and will provide useful information for CNT application and risk assessment.
Journal ArticleDOI
Amino-Functionalized Carbon Nanotubes for Binding to Polymers and Biological Systems
TL;DR: In this article, single-walled carbon nanotubes (SWCNTs) were functionalized with amino groups via chemical modification of carboxyl groups introduced on the carbon nanotide surface.
References
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Electronic structure of atomically resolved carbon nanotubes
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Solution Properties of Single-Walled Carbon Nanotubes
TL;DR: Both ionic and covalent solution-phase chemistry with concomitant modulation of the SWNT band structure were demonstrated to study the effects of chemical modifications on the band gaps of theSWNTs.
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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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Atomic structure and electronic properties of single-walled carbon nanotubes
TL;DR: In this paper, the structure and electronic properties of single-walled carbon nanotubes (SWNTs) were investigated using tunnelling microscopy, and it was shown that the SWNT samples exhibit many different structures, with no one species dominating.