Selective Detection of Vapor Phase Hydrogen Peroxide with Phthalocyanine Chemiresistors

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• 作者：Forest I. Bohrer ; Corneliu N. Colesniuc ; Jeongwon Park ; Ivan K. Schuller ; Andrew C. Kummel ; William C. Trogler
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：March 26, 2008
• 年：2008
• 卷：130
• 期：12
• 页码：3712 - 3713
• 全文大小：87K
• 年卷期：v.130,no.12(March 26, 2008)
• ISSN：1520-5126

文摘

The use of hydrogen peroxide as a precursor to improvised explosives has made its detection a topic of critical importance. Chemiresistor arrays comprised of 50 nm thick films of metallophthalocyanines (MPcs) are redox selective vapor sensors of hydrogen peroxide. Hydrogen peroxide is shown to decrease currents in cobalt phthalocyanine sensors while it increases currents in nickel, copper, and metal-free phthalocyanine sensors; oxidation and reduction of hydrogen peroxide via catalysis at the phthalocyanine surface are consistent with the pattern of sensor responses. This represents the first example of MPc vapor sensors being oxidized and reduced by the same analyte by varying the metal center. Consequently, differential analysis by redox contrast with catalytic amplification using a small array of sensors may be used to uniquely identify peroxide vapors. Metallophthalocyanine chemiresistors represent an improvement over existing peroxide vapor detection technologies in durability and selectivity in a greatly decreased package size.