Abstract
A diamond electrolyte solution-gate FET (SGFET) for use in electrolyte solutions has been fabricated for the first time. Perfect device characteristics (pinch-off and saturation in IDS-VDS) have been obtained with bias voltages within the potential window of diamond. The hydrogen-terminated (H-terminated) diamond surface was sensitive to halogen ions at approximately 30 mV/decade. We modified the H-terminated diamond surface with oxygen by treatment with ozone. Partially oxygen-terminated sites were insulating and insensitive to halogen ions. The H-terminated channel surface was modified to be partially amine-oxygen-terminated (H-A-O-terminated) to achieve pH sensitivity when irradiated with UV light in an ammonia solution. The pH sensitivity of a diamond surface modified was about 50 mV/pH unit from pH 2 to 10. We immobilized specific enzymes (urease and glucose oxidase) on the modified channel surface. The sensitivities to urea and glucose were approximately 30 mV/decade and 20 mV/decade, respectively.
Original language | English |
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Article number | NDFCT 497 |
Pages (from-to) | 325-335 |
Number of pages | 11 |
Journal | New Diamond and Frontier Carbon Technology |
Volume | 15 |
Issue number | 6 |
Publication status | Published - 2005 |
Keywords
- Biosensor
- Diamond SGFETs
- Enzyme
- Halogen ions
- pH
ASJC Scopus subject areas
- General Materials Science
- Surfaces and Interfaces
- Surfaces, Coatings and Films