Effects of Water and Different Solutes on Carbon-Nanotube Low-Voltage Field-Effect Transistors.

Autor: Foudeh AM; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA., Pfattner R; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.; Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, Bellaterra, 08193, Spain., Lu S; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.; Department of Electrical and Computer Engineering, Duke University, Durham, NC, 27708, USA., Kubzdela NS; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA., Gao TZ; Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA., Lei T; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.; Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China., Bao Z; Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2020 Aug; Vol. 16 (34), pp. e2002875. Date of Electronic Publication: 2020 Jul 21.
DOI: 10.1002/smll.202002875
Abstrakt: Semiconducting single-walled carbon nanotubes (swCNTs) are a promising class of materials for emerging applications. In particular, they are demonstrated to possess excellent biosensing capabilities, and are poised to address existing challenges in sensor reliability, sensitivity, and selectivity. This work focuses on swCNT field-effect transistors (FETs) employing rubbery double-layer capacitive dielectric poly(vinylidene fluoride-co-hexafluoropropylene). These devices exhibit small device-to-device variation as well as high current output at low voltages (<0.5 V), making them compatible with most physiological liquids. Using this platform, the swCNT devices are directly exposed to aqueous solutions containing different solutes to characterize their effects on FET current-voltage (FET I-V) characteristics. Clear deviation from ideal characteristics is observed when swCNTs are directly contacted by water. Such changes are attributed to strong interactions between water molecules and sp 2 -hybridized carbon structures. Selective response to Hg 2+ is discussed along with reversible pH effect using two distinct device geometries. Additionally, the influence of aqueous ammonium/ammonia in direct contact with the swCNTs is investigated. Understanding the FET I-V characteristics of low-voltage swCNT FETs may provide insights for future development of stable, reliable, and selective biosensor systems.
(© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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