title: Increasing the detection speed of an all-electronic real-time biosensor.
abstract: Biosensor response time, which depends sensitively on the transport of biomolecules to the sensor surface, is a critical concern for future biosensor applications. We have fabricated carbon nanotube field-effect transistor biosensors and quantified protein binding rates onto these nanoelectronic sensors. Using this experimental platform we test the effectiveness of a protein repellent coating designed to enhance protein flux to the all-electronic real-time biosensor. We observe a 2.5-fold increase in the initial protein flux to the sensor when upstream binding sites are blocked. Mass transport modelling is used to calculate the maximal flux enhancement that is possible with this strategy. Our results demonstrate a new methodology for characterizing nanoelectronic biosensor performance, and demonstrate a mass transport optimization strategy that is applicable to a wide range of microfluidic based biosensors.
authors.affiliation: Department of Physics, Oregon State University, Corvallis, OR 97331, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Leyden
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Messinger
authors.forename: Canan
authors.initials: C
authors.lastname: Schuman
authors.forename: Tal
authors.initials: T
authors.lastname: Sharf
authors.forename: Vincent T
authors.initials: VT
authors.lastname: Remcho
authors.forename: Todd M
authors.initials: TM
authors.lastname: Squires
authors.forename: Ethan D
authors.initials: ED
authors.lastname: Minot
mesh_terms: D015374:Biosensing Techniques; D004581:Electronics; D044085:Microfluidics; D036103:Nanotechnology; D011107:Polylysine / Q000737:chemistry; D013997:Time Factors
chemical_list: D011107:Polylysine