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

Dongjin Lee; Tianhong Cui

doi:10.1109/TRANSDUCERS.2011.5969302

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

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
Pages	2219-2222
Number of pages	4
DOIs	https://doi.org/10.1109/TRANSDUCERS.2011.5969302
State	Published - Sep 1 2011
Event	2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11 - Beijing, China Duration: Jun 5 2011 → Jun 9 2011

Other

Other	2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11
Country/Territory	China
City	Beijing
Period	6/5/11 → 6/9/11

Keywords

Carbon nanotube
chemoresistor
ISFET
pH sensor
silica nanoparticle

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10.1109/TRANSDUCERS.2011.5969302

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Tunable sensitivity and linearity of self-assembled carbon nanotube composite based pH biosensors using silica nanoparticles. / Lee, Dongjin; Cui, Tianhong.
2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11. 2011. p. 2219-2222 5969302.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Lee, D & Cui, T 2011, Tunable sensitivity and linearity of self-assembled carbon nanotube composite based pH biosensors using silica nanoparticles. in 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11., 5969302, pp. 2219-2222, 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11, Beijing, China, 6/5/11. https://doi.org/10.1109/TRANSDUCERS.2011.5969302

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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.",

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AB - 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.

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

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