Chemical Detection with a Single-Walled Carbon Nanotube Capacitor

Snow, E. S.; Perkins, F. Keith; Houser, Eric J.; Bădescu, Ştefan C.; Reinecke, T. L.

doi:10.1126/science.1109128

Cited by 920 publications

(611 citation statements)

References 21 publications

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“…AC impedance-sensing technique utilizing the second term in equation 1 has also been demonstrated in chemicapacitors 18 . A carbon nanotube network-based chemicapacitor exhibited a detection limit of 50 ppb for dimethylmethylphosphonate (DMMP) 19 . However, a large device footprint (millimetre scale) is necessary for accurate capacitance measurement, and the use of chemoselective polymers in those devices significantly slows down the response time to hundreds of seconds.…”

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confidence: 99%

“…As a result, device regeneration is achieved only through prolonged heating, current stimulation or ultraviolet radiation 8,[12][13][14]20,26,27 . Recently, various chemoselective surface coatings have been used 17,19,28 to reduce the response and recovery time to only a few seconds. However, those coatings function only for a narrow set of vapour molecules and may possibly result in even slower response to other vapour molecules 28 .…”

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confidence: 99%

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Graphene nanoelectronic heterodyne sensor for rapid and sensitive vapour detection

et al. 2014

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Nearly all existing nanoelectronic sensors are based on charge detection, where molecular binding changes the charge density of the sensor and leads to sensing signal. However, intrinsically slow dynamics of interface-trapped charges and defect-mediated charge-transfer processes significantly limit those sensors' response to tens to hundreds of seconds, which has long been known as a bottleneck for studying the dynamics of molecule-nanomaterial interaction and for many applications requiring rapid and sensitive response. Here we report a fundamentally different sensing mechanism based on molecular dipole detection enabled by a pioneering graphene nanoelectronic heterodyne sensor. The dipole detection mechanism is confirmed by a plethora of experiments with vapour molecules of various dipole moments, particularly, with cis-and trans-isomers that have different polarities. Rapid (down to B0.1 s) and sensitive (down to B1 ppb) detection of a wide range of vapour analytes is achieved, representing orders of magnitude improvement over state-of-the-art nanoelectronics sensors.

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confidence: 99%

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confidence: 99%

Graphene nanoelectronic heterodyne sensor for rapid and sensitive vapour detection

et al. 2014

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“…3b, the OFET-based sensor with TSB3 exhibited a significant decrease in the output current when the device was exposed to methanol vapour. In addition, the response and recovery occurred within a few seconds, which demonstrates a remarkably fast and stable performance compared with previous OFET-based sensors 22,23 as well as for other chemical sensors based on conducting polymers 24 , carbon nanotubes 25 or inorganic semiconductors 26 . On the other hand, the OFET-based sensors without TSB3 showed much lower sensitivity under the same condition.…”

Section: Resultsmentioning

confidence: 67%

Enhancing 2D growth of organic semiconductor thin films with macroporous structures via a small-molecule heterointerface

et al. 2014

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The physical structure of an organic solid is strongly affected by the surface of the underlying substrate. Controlling this interface is an important issue to improve device performance in the organic electronics community. Here we report an approach that utilizes an organic heterointerface to improve the crystallinity and control the morphology of an organic thin film. Pentacene is used as an active layer above, and m-bis(triphenylsilyl)benzene is used as the bottom layer. Sequential evaporations of these materials result in extraordinary morphology with far fewer grain boundaries and myriad nanometre-sized pores. These peculiar structures are formed by difference in molecular interactions between the organic layers and the substrate surface. The pentacene film exhibits high mobility up to 6.3 cm 2 V À 1 s À 1 , and the pore-rich structure improves the sensitivity of organic-transistor-based chemical sensors. Our approach opens a new way for the fabrication of nanostructured semiconducting layers towards high-performance organic electronics.

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“…The fringing electric field radiating from the CNT surface polarized the molecules, increasing the capac- ity of the system. Different chemical vapors including NO 2 and NH 3 , and a wide range of chemicals were detected [35,160,[178][179][180][181]. A more sophisticated system based on a single-strand DNA-SWNT-FET was designed.…”

Section: Fet Biosensorsmentioning

confidence: 99%

“…Semiconducting nanotubes represent about two-thirds of the SWNTs, whereas metallic tubes represent about one-third. These properties could be exploited for the fabrication of new electronic devices containing CNTs such as field-effect transistors (FETs), nanoelectrode arrays (NEAs), nanoelectrode ensembles (NEEs) or screen-printed electrodes (SPEs) [158][159][160][161][162][163][164][165][166][167]. FET devices need semiconductor-type nanotubes.…”

Section: Cnts In Diagnosismentioning

confidence: 99%