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Fabrication and carbon monoxide sensing characteristics of mesostructured carbon gas sensors

Authors
Journal
Sensors and Actuators B Chemical
0925-4005
Publisher
Elsevier
Publication Date
Volume
143
Issue
1
Identifiers
DOI: 10.1016/j.snb.2009.08.008
Keywords
  • Gas Sensor
  • Dep
  • Mesoporous
  • Co
  • Ordered
  • Pore

Abstract

Abstract We demonstrated a micro-chemoresistive gas sensing device using mesoporous carbon as the sensitive film and immobilized by dielectrophoresis (DEP) process. The mesoporous materials were characterized by X-ray diffraction (XRD) patterns, N 2 adsorption–desorption isotherms, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). N 2 adsorption–desorption isotherms shows the specific surface area of 1200 m 2/g, total pore volume is 1.2 cm 3/g of the mesoporous carbon, and the pore size distribution of mesoporous carbon yields an average pore size of 3 nm. SEM images show a rod-like morphology and TEM images show a highly ordered pore channel with linear arrays. CO gas sensor properties were measured and the resulting sensitivities were 5.7, 6.8, 8.8, 11.6, and 37.6% for concentrations of 30, 45, 60, 75, and 90 ppm, respectively. Additionally, this sensor also exhibited high sensitivity and fast response times for CO gas.

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