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
Citations
More filters
Journal ArticleDOI
Enhanced gas sensing in pristine carbon nanotubes under continuous ultraviolet light illumination
TL;DR: It is shown that despite considerable achievements in the last decade, continuous in situ cleaning of carbon nanotubes with ultraviolet light during gas sensing can still dramatically enhance their performance and is illustrated how to address gas selectivity by introducing a gate bias.
Journal ArticleDOI
Easy-to-operate and low-temperature synthesis of gram-scale nitrogen-doped graphene and its application as cathode catalyst in microbial fuel cells.
TL;DR: An easy-to-operate and low-temperature method to synthesize nitrogen-doped graphene in gram-scale quantities with a denotation process is reported, and the synthesized NG was demonstrated to act as a metal-free electrode with excellent electrocatalytic activity and long-term operation stability for oxygen reduction via a combination of two-Electron and four-electron pathways.
Journal ArticleDOI
Silicon-based nanoelectronic field-effect pH sensor with local gate control
TL;DR: In this paper, the authors demonstrate the operation of a nanoscale field-effect pH sensor engineered from a functionalized silicon nanowire, which can detect the change in the hydrogen ion concentration or the pH value of a solution can be detected by the corresponding change in a differential conductance with a resolution of ±5nS∕pH.
Journal ArticleDOI
Transparent and flexible carbon nanotube/polyaniline pH sensors
M. Kaempgen,S. Roth +1 more
TL;DR: In this paper, a carbon nanotube network is used as a conductive, transparent and flexible backbone structure for electrochemically deposited polyaniline, which is sensitive to pH allowing the determination of pH values ranging from pH 1 to 13.
Journal ArticleDOI
Biosensor technology for detecting biological warfare agents : Recent progress and future trends
TL;DR: In this paper, the authors outline the important issues with regards to the development of biosensors for the monitoring of biological warfare agents (BWAs) starting with the basic components of biosensor and the features of BWAs, which are compatible with detection using biological recognition molecules.
References
More filters
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.