Sub-ppm detection of vapors using piezoresistive microcantilever array sensors

Genki Yoshikawa, Hans Peter Lang, Terunobu Akiyama, Laure Aeschimann, Urs Staufer, Peter Vettiger, Masakazu Aono, Toshio Sakurai, Christoph Gerber

    Research output: Contribution to journalArticlepeer-review

    39 Citations (Scopus)

    Abstract

    The performance of microfabricated piezoresistive cantilever array sensors has been evaluated using various vapors of volatile organic compounds including alkanes with different chain length from 5 (n-pentane) to 14 (n-tetradecane). We demonstrate that piezoresistive microcantilever array sensors have the selectivity of discriminating individual alkanes in a homologous series as well as common volatile organic compounds according to principal component analysis. We developed a new method to evaluate the sensitivity, taking advantage of the low vapor pressures of alkanes with longer chains, such as n-dodecane, n-tridecane and n-tetradecane, under saturated vapor conditions. This method reveals sub-ppm sensitivity and the cantilever response is found to follow the mass of evaporated analytes as calculated using a quantitative model based on the Langmuir evaporation model.

    Original languageEnglish
    Article number015501
    JournalNanotechnology
    Volume20
    Issue number1
    DOIs
    Publication statusPublished - 2009 Jan 7

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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