Role of Defects in Single-Walled Carbon Nanotube Chemical Sensors

Robinson, Joshua A.; Snow, E. S.; Bădescu, Ştefan C.; Reinecke, T. L.; Perkins, F. Keith

doi:10.1021/nl0612289

Cited by 427 publications

(337 citation statements)

References 25 publications

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“…23 Residual oxygen defects such as carboxylic acids or epoxides in the reduced graphite oxide film should result in higher binding energies and may be responsible for the longer response times; this has been proposed earlier in the response of carbon nanotube sensors. 27 The micro hot plate sensor provides very fast temperature control and modulation and is a very useful tool in characterization of sensor materials and as an important enhancement to sensor response, recovery, and data interpretation.…”

Section: Resultsmentioning

confidence: 99%

Practical Chemical Sensors from Chemically Derived Graphene

et al. 2009

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We report the development of useful chemical sensors from chemically converted graphene dispersions using spin coating to create single-layer films on interdigitated electrode arrays. Dispersions of graphene in anhydrous hydrazine are formed from graphite oxide. Preliminary results are presented on the detection of NO 2 , NH 3 , and 2,4-dinitrotoluene using this simple and scalable fabrication method for practical devices. Current versus voltage curves are linear and ohmic in all cases, studied independent of metal electrode or presence of analytes. The sensor response is consistent with a charge transfer mechanism between the analyte and graphene with a limited role of the electrical contacts. A micro hot plate sensor substrate is also used to monitor the temperature dependence of the response to nitrogen dioxide. The results are discussed in light of recent literature on carbon nanotube and graphene sensors.

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Section: Resultsmentioning

confidence: 99%

Practical Chemical Sensors from Chemically Derived Graphene

et al. 2009

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“…T opological defects improve the sensitivity of carbon-based chemical sensors towards gas molecules due to an efficient physisorption and enhanced charge transfer process [1][2][3][4][5][6][7] . Since such defects are formed within a single-crystalline graphene lattice, they have a modest effect on the electronic properties of the device.…”

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confidence: 99%

Chemical sensing with switchable transport channels in graphene grain boundaries

et al. 2014

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Grain boundaries can markedly affect the electronic, thermal, mechanical and optical properties of a polycrystalline graphene. While in many applications the presence of grain boundaries in graphene is undesired, here we show that they have an ideal structure for the detection of chemical analytes. We observe that an isolated graphene grain boundary has B300 times higher sensitivity to the adsorbed gas molecules than a single-crystalline graphene grain. Our electronic structure and transport modelling reveal that the ultrasensitivity in grain boundaries is caused by a synergetic combination of gas molecules accumulation at the grain boundary, together with the existence of a sharp onset energy in the transmission spectrum of its conduction channels. The discovered sensing platform opens up new pathways for the design of nanometre-scale highly sensitive chemical detectors.

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“…Furthermore, charge transfer has been found to occur when the electron-donating adsorbate binds to a defect site in SWNTs. 38,39 Therefore, we employed 4-aminothiophenol (4ATP; Fig. 1(b), middle) as a tip molecule for STM observations of SWNTs.…”

Section: ·3 Visualization Of Atomic Defects In Carbon Nanotubesmentioning

confidence: 99%

Molecular Tips for Scanning Tunneling Microscopy: Intermolecular Electron Tunneling for Single-molecule Recognition and Electronics

Nishino

2014

ANAL. SCI.

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This paper reviews the development of molecular tips for scanning tunneling microscopy (STM). Molecular tips offer many advantages: first is their ability to perform chemically selective imaging because of chemical interactions between the sample and the molecular tip, thus improving a major drawback of conventional STM. Rational design of the molecular tip allows sophisticated chemical recognition; e.g., chiral recognition and selective visualization of atomic defects in carbon nanotubes. Another advantage is that they provide a unique method to quantify electron transfer between single molecules. Understanding such electron transfer is mandatory for the realization of molecular electronics.

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Role of Defects in Single-Walled Carbon Nanotube Chemical Sensors

Cited by 427 publications

References 25 publications

Practical Chemical Sensors from Chemically Derived Graphene

Practical Chemical Sensors from Chemically Derived Graphene

Chemical sensing with switchable transport channels in graphene grain boundaries

Molecular Tips for Scanning Tunneling Microscopy: Intermolecular Electron Tunneling for Single-molecule Recognition and Electronics

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