The effect of sequence length on DNA decorated CNT gas sensors

Liu, Y.; Chen, M.; Mohebbi, Marjan; Wang, M.L.; Dokmeci, Mehmet R.

doi:10.1109/transducers.2011.5969345

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…To enhance the selectivity to certain gases, CNTs could be mixed with silane which also raises CNTs' mechanical adhesion to the substrate [ 137 ]. In terms of improving sensitivity, oligonucleotides (DNA and RNA) could be utilized and the length of DNA sequence impacts the response process of CNT gas sensors [ 138 ]. On the other hand, CNTs could also be incorporated into other sensing materials such as metal oxide semiconductors to improve their sensitivity [ 122 ].…”

Section: Gas Sensing Methodsmentioning

confidence: 99%

A Survey on Gas Sensing Technology

Liu

Cheng

Hong

et al. 2012

Sensors

1,241

688

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Sensing technology has been widely investigated and utilized for gas detection. Due to the different applicability and inherent limitations of different gas sensing technologies, researchers have been working on different scenarios with enhanced gas sensor calibration. This paper reviews the descriptions, evaluation, comparison and recent developments in existing gas sensing technologies. A classification of sensing technologies is given, based on the variation of electrical and other properties. Detailed introduction to sensing methods based on electrical variation is discussed through further classification according to sensing materials, including metal oxide semiconductors, polymers, carbon nanotubes, and moisture absorbing materials. Methods based on other kinds of variations such as optical, calorimetric, acoustic and gas-chromatographic, are presented in a general way. Several suggestions related to future development are also discussed. Furthermore, this paper focuses on sensitivity and selectivity for performance indicators to compare different sensing technologies, analyzes the factors that influence these two indicators, and lists several corresponding improved approaches.

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Section: Gas Sensing Methodsmentioning

confidence: 99%

A Survey on Gas Sensing Technology

Liu

Cheng

Hong

et al. 2012

Sensors

1,241

688

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“…MWCNTs were used to detect NH 3 gas prepared using chemical vapor deposition, and variations in electrical resistance indicated the presence of ammonia gas. Carbon nanotubes have also been used to detect biomolecules [6]; in that work, the effect of decorating the CNT surface with DNA molecules on the sensing properties of the CNT was examined. A CNT-based sensor was integrated with a CMOS chip to permit the detection of hydrogen gas using a single chip, which minimizes the area and power required [7].…”

Section: Introductionmentioning

confidence: 99%

Electron transport properties of a single-walled carbon nanotube in the presence of hydrogen cyanide: first-principles analysis

et al. 2015

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First-principles analysis based on density functional theory was performed to compute the electronic and transport properties of a single-walled carbon nanotube in the presence of hydrogen cyanide. A chiral (4,1) carbon nanotube was found to become less metallic as the number of hydrogen cyanide molecules nearby increased. When there were a sufficient number of hydrogen cyanide molecules close to the nanotube, it became semiconducting. This metallic to semiconducting transformation of the nanotube was verified by analyzing its conductance and current as a function of the number of molecules of hydrogen cyanide present. The conductivity of the carbon nanotube was very high when no hydrogen cyanide molecules were present, but decreased considerably when even just a single hydrogen cyanide molecule approached the surface of the nanotube.

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