期刊
CHEMISTRY OF MATERIALS
卷 20, 期 23, 页码 7332-7338出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm802530x
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资金
- NASA
- Stanford Center for Polymeric Interfaces and Macromolecular Assemblies (NSF-Center MRSEC)
- NSF-EXP sensor program
- 3M Faculty Award
- Sloan Research Fellowship
- Finmeccanica Faculty Scholar Fund
Low-voltage organic thin-film transistors were fabricated to investigate the stability of organic semiconductors in water and determine the critical parameters for aqueous phase chemical detection. We showed that the molecular structure, alkyl-chain length, and thin-film morphology strongly influence the electrical characteristics in water. Highly two-dimensional films of alkyl-substituted semiconductors greatly reduced the influence of water on the electrical characteristics. The sensitivity and response times of OTFT sensors were also impacted by the thin-film structure of the organic semiconductor. OTFT sensors were used to detect 10 parts per-billion cysteine and 40 ppm TNT in aqueous solutions.
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