Nanowire sensor for volatile organic compounds by formation of charge transfer complex

Kumi Masunaga, Motohiro Sato, Kenshi Hayashi, Kiyoshi Toko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Recently, the electrical characteristics of metal-molecule-metal nanowires are studied. Interaction between the junction molecule and the analytes will affect the molecular orbital that alters a conductive path. We have been interested in charge transfer (CT) interaction that induces the partial transfer of electron from an electron donor to an electron acceptor. The measurement result obtained with crossed-wire tunneling junction indicated that the CT interaction provides a significant conductance change of the junction molecule. In this report, we suggest a nanowire sensor to detect volatile organic compounds (VOC) by conductance switching brought on by the charge transfer interaction. The sensor surface possesses a molecular wire network formed by bridging nanogaps between Au nanoparticles (Au-NPs) with electron donor molecules. The Au-NPs were fabricated by sputter deposition with controlling the particle-size and the gap-size. We confirmed the donor oligothiophene bridging by resistance transition and the formation of CT interaction between oligothiophene and analytes by fluorescence quenching. The conductance of the sensor electrode increased by adsorption of electron acceptors, such as iodine and aromatic nitro compounds.

Original languageEnglish
Title of host publicationThe 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Number of pages4
Publication statusPublished - Dec 1 2007
Event6th IEEE Conference on SENSORS, IEEE SENSORS 2007 - Atlanta, GA, United States
Duration: Oct 28 2007Oct 31 2007


Other6th IEEE Conference on SENSORS, IEEE SENSORS 2007
Country/TerritoryUnited States
CityAtlanta, GA

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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