Enhanced Mass Sensitivity of Carbon Nanotube Multilayer Measured by QCM-Based Gas Sensors

  • M. Penza
  • P. Aversa
  • R. Rossi
  • M. Alvisi
  • G. Cassano
  • D. Suriano
  • E. Serra
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 91)

Abstract

A Quartz Crystal Microbalance (QCM) gas sensor coated with carbon nanotubes (CNTs) layered films as chemically interactive nanomaterial is described. A QCM resonator integrated on AT-cut quartz substrate has been functionally characterized as oscillator at the resonant frequency of 10 MHz. The CNTs have been grown by chemical vapor deposition (CVD) system onto alumina substrates, coated with 2.5 nm thick Fe catalyst, at a temperature of 750°C in H2/C2H2 gaseous ambient as active materials for gas sensors. CNTs multilayers, with and without buffer layer of cadmium arachidate (CdA), have been prepared by the Langmuir–Blodgett (LB) technique to coat at the double-side the QCM sensors for organic vapor detection, at room temperature. It was demonstrated that the highest mass sensitivity has been achieved for CNTs multilayer onto CdA buffer material due to the greatest gas adsorbed mass. The sensing properties of the CNTs-sensors at enhanced mass sensitivity have been investigated for three different vapors of ethylacetate, acetone and m-xylene in the range of gas concentration from 10 to 800 ppm. The CNTs-based QCM-sensors exhibit high sensitivity (e.g., 5.55 Hz/ppm to m-xylene of the CNTs-multilayer) at room temperature, fast response, linearity, reversibility, repeatability, low drift of the baseline frequency, potential sub-ppm range detection limit.

Keywords

Buffer Layer Quartz Crystal Microbalance Mass Sensitivity Quartz Crystal Microbalance Sensor Quartz Crystal Microbalance Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • M. Penza
    • 1
  • P. Aversa
    • 1
  • R. Rossi
    • 1
  • M. Alvisi
    • 1
  • G. Cassano
    • 1
  • D. Suriano
    • 1
  • E. Serra
    • 2
  1. 1.Brindisi Technical Unit for Technologies of MaterialsENEABrindisiItaly
  2. 2.Casaccia Technical Unit for Technologies of MaterialsENEARomeItaly

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