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Bohrer FI, Sharoni A, Colesniuc C, et al. Gas sensing mechanism in chemiresistive cobalt and metal-free phthalocyanine thin films. J Am Chem Soc. 2007;129(17):5640-6doi: 10.1021/ja0689379.
Bohrer, F. I., Sharoni, A., Colesniuc, C., Park, J., Schuller, I. K., Kummel, A. C., & Trogler, W. C. (2007). Gas sensing mechanism in chemiresistive cobalt and metal-free phthalocyanine thin films. Journal of the American Chemical Society, 129(17), 5640-6. https://doi.org/10.1021/ja0689379
Bohrer, Forest I, et al. "Gas sensing mechanism in chemiresistive cobalt and metal-free phthalocyanine thin films." Journal of the American Chemical Society vol. 129,17 (2007): 5640-6. doi: https://doi.org/10.1021/ja0689379
Bohrer FI, Sharoni A, Colesniuc C, Park J, Schuller IK, Kummel AC, Trogler WC. Gas sensing mechanism in chemiresistive cobalt and metal-free phthalocyanine thin films. J Am Chem Soc. 2007 May 02;129(17):5640-6. doi: 10.1021/ja0689379. Epub 2007 Apr 06. PMID: 17411043.
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J Am Chem Soc. 2007 May 02;129(17):5640-6. doi: 10.1021/ja0689379. Epub 2007 Apr 06.

Gas sensing mechanism in chemiresistive cobalt and metal-free phthalocyanine thin films.

Journal of the American Chemical Society

Forest I Bohrer, Amos Sharoni, Corneliu Colesniuc, Jeongwon Park, Ivan K Schuller, Andrew C Kummel, William C Trogler

Affiliations

  1. Department of Chemistry and Biochemistry, Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA.

PMID: 17411043 DOI: 10.1021/ja0689379

Abstract

The gas sensing behaviors of cobalt phthalocyanine (CoPc) and metal-free phthalocyanine (H2Pc) thin films were investigated with respect to analyte basicity. Chemiresistive sensors were fabricated by deposition of 50 nm thick films on interdigitated gold electrodes via organic molecular beam epitaxy (OMBE). Time-dependent current responses of the films were measured at constant voltage during exposure to analyte vapor doses. The analytes spanned a range of electron donor and hydrogen-bonding strengths. It was found that, when the analyte exceeded a critical base strength, the device responses for CoPc correlated with Lewis basicity, and device responses for H2Pc correlated with hydrogen-bond basicity. This suggests that the analyte-phthalocyanine interaction is dominated by binding to the central cavity of the phthalocyanine with analyte coordination strength governing CoPc sensor responses and analyte hydrogen-bonding ability governing H2Pc sensor responses. The interactions between the phthalocyanine films and analytes were found to follow first-order kinetics. The influence of O2 on the film response was found to significantly affect sensor response and recovery. The increase of resistance generally observed for analyte binding can be attributed to hole destruction in the semiconductor film by oxygen displacement, as well as hole trapping by electron donor ligands.

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