Tunable sensitivity and linearity of self-assembled carbon nanotube composite based pH biosensors using silica nanoparticles

Dongjin Lee, Tianhong Cui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We describe tunable sensitivity and linearity of layer-by-layer (LbL) self-assembled single-walled carbon nanotube (SWCNT) thin-film composites as a pH sensor by means of silica nanoparticles (SNPs). The SWCNT thin-film devices without and with SNP layer were fabricated with LbL self-assembly and characterized electrochemically in pH buffers. The role of SNPs in SWCNT thin-film chemoresistors and ISFETs is proven to increase and linearize the sensitivity to pH. The linearization in presence of SNP layer is attributed to a positive shift in pH gating voltage in p-type semiconducting SWCNTs. Two types of sensitivity, linear and exponential behaviors found with and without SNP layer, are useful for developing biosensors.

Original languageEnglish (US)
Title of host publication2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
Pages2219-2222
Number of pages4
DOIs
StatePublished - Sep 1 2011
Event2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11 - Beijing, China
Duration: Jun 5 2011Jun 9 2011

Other

Other2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
CountryChina
CityBeijing
Period6/5/116/9/11

Keywords

  • Carbon nanotube
  • chemoresistor
  • ISFET
  • pH sensor
  • silica nanoparticle

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