Journal
IEEE ELECTRON DEVICE LETTERS
Volume 32, Issue 8, Pages 1143-1145Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2011.2155025
Keywords
Ammonia; gas sensor; pentacene; porous; thin-film transistor (TFT)
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Funding
- National Science Council [NSC-99-2627-B-009-006]
- Veterans General Hospitals University System of Taiwan [VGHUST100-G5-1-3]
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A pentacene-based organic thin-film transistor (OTFT) with a porous active layer is demonstrated for the first time. The porous OTFT exhibits a fast, sensitive, and reversible response to ammonia gas with a detection limit as 500 ppb, whereas the OTFT without porous structure has a slow response and a poor recovery behavior. The sensing mechanism dominated by the dissociation of hydroxyl groups of the polymer dielectric layer is raised and discussed. The proposed device is the first OTFT-based ammonia sensor with reversible response and high sensitivity in low parts-per-million range. It is promising for the development of a diagnostic breath analysis system.
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