In this study, enzyme-free glucose sensors with channels composed of necked zinc oxide (ZnO) nanoparticles (NPs) are constructed on a plastic substrate, and their sensing characteristics are examined. When a phosphate buffer solution (PBS) of lower pH than the isoelectric point of ZnO is adsorbed on the necked ZnO NP channels, the current increases remarkably in magnitude at a bias voltage of 10 V compared with ZnO NP channels without the adsorption of PBS. The current decreases in magnitude with increasing number of moles of added glucose. When 2.5 × 10-12 moles of glucose are adsorbed on the PBS-adsorbed channels, the current in the channels at 10 V decreases in magnitude from 4.7 μA to 600 nA. The enzyme-free glucose sensors can detect 5 × 10-13 moles of glucose in air at room temperature.
Bibliographical noteFunding Information:
This work was supported by the IT R&D program of MKE/KEIT (10030559, Development of next-generation high-performance organic/nano materials and printing process technology), the Nano R&D Program (M10703000980-08M0300-98010), and the World Class University Project (WCU, R32-2008-000-10082-0) of the Ministry of Education, Science, and Technology (Korea Science and Engineering Foundation).
- Plastic sensor
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Electrical and Electronic Engineering