Selective detection of vapor phase hydrogen peroxide with phthalocyanine chemiresistors

被引:105
作者
Bohrer, Forest I. [1 ]
Colesniuc, Corneliu N. [1 ]
Park, Jeongwon [1 ]
Schuller, Ivan K. [1 ]
Kummel, Andrew C. [1 ]
Trogler, William C. [1 ]
机构
[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
关键词
D O I
10.1021/ja710324f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:3712 / +
页数:3
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