title: Effect of channel length on the electrical response of carbon nanotube field-effect transistors to deoxyribonucleic acid hybridization.
abstract: A single-walled carbon nanotube (SWCNT) in a field-effect transistor (FET) configuration provides an ideal electronic path for label-free detection of nucleic acid hybridization. The simultaneous influence of more than one response mechanism in hybridization detection causes a variation in electrical parameters such as conductance, transconductance, threshold voltage and hysteresis gap. The channel length (L) dependence of each of these parameters necessitates the need to include them when interpreting the effect of L on the response to hybridization. Using the definitions of intrinsic effective mobility (µe) and device field-effect mobility (µf), two new parameters were defined to interpret the effect of L on the FET response to hybridization. Our results indicate that FETs with ≈300 µm long SWCNT exhibited the most appreciable response to hybridization, which complied with the variation trend in response to the newly defined parameters.
authors.affiliation: School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
authors.forename: Hari Krishna
authors.initials: HK
authors.lastname: Salila Vijayalal Mohan
authors.affiliation: School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
authors.forename: Jianing
authors.initials: J
authors.lastname: An
authors.affiliation: Temasek Laboratories, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore ; Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, 710072, Xi'an, PR China.
authors.forename: Yani
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
authors.forename: Chee How
authors.initials: CH
authors.lastname: Wong
authors.affiliation: School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore ; Department of Mechanical Engineering, Khalifa University of Science, Technology & Research (KUSTAR), P.O. Box 127788, Abu Dhabi, United Arab Emirates.
authors.forename: Lianxi
authors.initials: L
authors.lastname: Zheng
keywords: biosensor; carbon nanotubes; channel length; field-effect transistor; hybridization; mobility; nucleic acid