Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 36, Pages 14650-14653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja305287p
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Funding
- JHSPH Center for a Livable Future
- NIEHS Center in Urban Environmental Health [P30 ES 03819]
- Johns Hopkins Environment, Energy, Sustainability, and Health Institute
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We have increased organic field-effect transistor (OFET) NH3 response using tris-(pentafluorophenyl)borane (TPFB) as a receptor. OFETs with this additive could detect concentrations of 450 ppb v/v, with a limit of detection of 350 ppb, the highest sensitivity reported to date for semiconductor films; in comparison, when triphenylmethane (TPM) or triphenylborane (TFB) was used as an additive, no obvious improvement in the sensitivity was observed. These OFETs also showed considerable selectivity with respect to common organic vapors and stability toward storage. Furthermore, excellent memory of exposure was achieved by keeping the exposed devices in a sealed container stored at -30 degrees C, the first such capability demonstrated with OFETs.
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