Layer-by-Layer Self-Assembled Single-Walled Carbon Nanotubes Based Ion-Sensitive Conductometric Glucose Biosensors

Dongjin Lee, Tianhong Cui

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We present ion-sensitive conductometric glucose sensors prepared by layer-by-layer (LbL) nano self-assembly of single-walled carbon nanotube (SWNT) and enzyme glucose oxidase (GOx). The carboxylated SWNT and GOx are self-assembled alternatively with a positively charged polyelectrolyte, poly(diallyldimethylammonium chloride, PDDA). Quartz crystal microbalance (QCM) study and Fourier transform infrared (FTIR) spectroscopy demonstrate GOx is negatively charged, and it is possible to successively construct multilayer alternatively with PDDA. SWNT multilayer shows pH-dependent conductance at different pH buffer solutions, which decreases exponentially with an increase in pH. The concentration of glucose is electronically characterized based on the fact that hydrogen ions from glucose oxidation with the aid of GOx change the local pH value in the vicinity of SWNT multilayer thin-film, thereby yielding higher conductance. The overall sensitivity is 10.8 µ?/mM and the resolution of device fabricated is 1 pM at the bias voltage of 0.6 V. The LbL assembled SWNT multilayer is proven to be versatile for sensing biochemical reactions with many other enzyme systems.

Original languageEnglish (US)
Pages (from-to)449-456
Number of pages8
JournalIEEE Sensors Journal
Volume9
Issue number4
DOIs
StatePublished - Jan 1 2009

Fingerprint

Single-walled carbon nanotubes (SWCN)
bioinstrumentation
Glucose oxidase
Biosensors
glucose
Glucose
carbon nanotubes
oxidase
Ions
Multilayers
ions
Enzymes
Glucose sensors
enzymes
Quartz crystal microbalances
Multilayer films
Bias voltage
Polyelectrolytes
Self assembly
Fourier transform infrared spectroscopy

Keywords

  • Fourier transform infrared (FTIR)
  • glucose oxidase (GOx)
  • glucose sensor
  • layer-by-layer (LbL) assembly
  • quartz crystal microbalance (QCM)
  • single-walled carbon nanotube (SWNT)

Cite this

Layer-by-Layer Self-Assembled Single-Walled Carbon Nanotubes Based Ion-Sensitive Conductometric Glucose Biosensors. / Lee, Dongjin; Cui, Tianhong.

In: IEEE Sensors Journal, Vol. 9, No. 4, 01.01.2009, p. 449-456.

Research output: Contribution to journalArticle

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