Journal ArticleDOI
Extreme oxygen sensitivity of electronic properties of carbon nanotubes
TLDR
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.Abstract:
The electronic properties of single-walled carbon nanotubes are shown here to be extremely sensitive to the chemical environment. Exposure to air or oxygen dramatically influences the nanotubes' electrical resistance, thermoelectric power, and local density of states, as determined by transport measurements and scanning tunneling spectroscopy. These electronic parameters can be reversibly "tuned" by surprisingly small concentrations of adsorbed gases, and an apparently semiconducting nanotube can be converted into an apparent metal through such exposure. These results, although demonstrating that nanotubes could find use as sensitive chemical gas sensors, likewise indicate that many supposedly intrinsic properties measured on as-prepared nanotubes may be severely compromised by extrinsic air exposure effects.read more
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Synthesis of vertically aligned single- and double-walled carbon nanotubes without etching agents
TL;DR: The number of graphene shells on carbon nanotubes (CNTs) can be rationally controlled to yield high-density, vertically aligned single and double-walled CNTs as mentioned in this paper.
Journal ArticleDOI
Chemical sensors using peptide-functionalized conducting polymer nanojunction arrays
Alvaro Diaz Aguilar,Erica Forzani,Xiulan Li,Nongjian Tao,Larry A. Nagahara,Islamshah Amlani,Raymond K. Tsui +6 more
TL;DR: In this article, a heavy metal ion sensor for drinking water analysis using a conducting polymer nanojunction array is presented, which allows real-time detection of Cu2+ and Ni2+ at ppt range.
Journal ArticleDOI
The effect of multiwalled carbon nanotube doping on the CO gas sensitivity of SnO2-based nanomaterials
Abstract: A simple in situ method is applied for the synthesis of SnO2-coated multiwalled nanotubes (MWNTs), in which MWNT bundles are uniformly coated with a monolayer of SnO2 nanoparticles (~4 nm). A hybrid SnO2 material combined with 0.1% wt MWNTs is fabricated and its CO gas-sensing properties are evaluated. SnO2-coated MWNTs are homogeneously distributed in the SnO2 matrix and the specific surface area of the hybrid material is nearly two times higher compared to pure SnO2 material. The electrical resistance is found to be dramatically decreased by three orders of magnitude compared to a conventional SnO2 sensor. The CO gas sensitivity is found to be three times higher than that of a SnO2 sensor, with good stability, indicating that the addition of 0.1% wt MWNTs is effective in improving the sensitivity towards CO. A model is proposed to explain the improvement of CO gas sensitivity for our hybrid MWNT/SnO2 material.
Journal ArticleDOI
Electronic conduction in multi-walled carbon nanotubes: role of intershell coupling and incommensurability
TL;DR: Geometry incommensurability between weakly coupled shells in multi-walled carbon nanotubes is shown to be the origin of unconventional electronic conduction mechanism, power-law scaling of the conductance, and remarkable magnetotransport and low temperature dependent conductivity when the dephasing mechanism is dominated by weak electron-electron coupling.
Journal ArticleDOI
Engineering Carbon Materials for Electrochemical Oxygen Reduction Reactions
TL;DR: In this article, the authors review recent progress in engineering carbon materials from exotic chemical doping to intrinsic geometric defects for improved electrochemical oxygen reduction reaction (ORR) catalysts, providing useful pathways for more efficient and reliable energy conversion technologies.
References
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Journal ArticleDOI
Crystalline Ropes of Metallic Carbon Nanotubes
Andreas Thess,R. S. Lee,Pavel Nikolaev,Hongjie Dai,Pierre Petit,J. Robert,Chunhui Xu,Young Hee Lee,Seong-Gon Kim,Andrew G. Rinzler,Daniel T. Colbert,Gustavo E. Scuseria,David Tománek,John E. Fischer,Richard E. Smalley +14 more
TL;DR: X-ray diffraction and electron microscopy showed that fullerene single-wall nanotubes (SWNTs) are nearly uniform in diameter and that they self-organize into “ropes,” which consist of 100 to 500 SWNTs in a two-dimensional triangular lattice with a lattice constant of 17 angstroms.
Book
Science of fullerenes and carbon nanotubes
TL;DR: In this paper, the authors present a detailed overview of the properties of Fullerenes and their properties in surface science applications, such as scanning tunnel microscopy, growth and fragmentation studies, and chemical synthesis.
Journal ArticleDOI
Storage of hydrogen in single-walled carbon nanotubes
A. C. Dillon,Kim M. Jones,T. A. Bekkedahl,Ching-Hwa Kiang,Donald S. Bethune,Michael J. Heben +5 more
TL;DR: In this article, a gas can condense to high density inside narrow, single-walled nanotubes (SWNTs) under conditions that do not induce adsorption within a standard mesoporous activated carbon.
Journal ArticleDOI
New one-dimensional conductors: Graphitic microtubules.
TL;DR: It is predicted that carbon microtubules exhibit striking variations in electronic transport, from metallic to semiconducting with narrow and moderate band gaps, depending on the diameter of the tubule and on the degree of helical arrangement of the carbon hexagons.
Journal ArticleDOI
Individual single-wall carbon nanotubes as quantum wires
Sander J. Tans,Michel Devoret,Hongjie Dai,Andreas Thess,Richard E. Smalley,L.J. Geerligs,Cees Dekker +6 more
TL;DR: In this article, electrical transport measurements on individual single-wall nanotubes have been performed to confirm the theoretical predictions of single-walled nanotube quantum wires, and they have been shown to act as genuine quantum wires.