Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201701117
Keywords
gas sensors; healthcare monitoring; nanoporous films; organic semiconductors; solution processes
Categories
Funding
- University of Illinois
- National Science Foundation, Division of Materials Research [1641854]
- Office of Naval Research Young Investigator Program (ONR YIP) [N00014-16-1-2551]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1641854] Funding Source: National Science Foundation
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Porous materials are ubiquitous in nature and have found a wide range of applications because of their unique absorption, optical, mechanical, and catalytic properties. Large surface-area-to-volume ratio is deemed a key factor contributing to their catalytic properties. Here, it is shown that introducing tunable nanopores (50-700 nm) to organic semiconductor thin films enhances their reactivity with volatile organic compounds by up to an order of magnitude, while the surface-area-to-volume ratio is almost unchanged. Mechanistic investigations show that nanopores grant direct access to the highly reactive sites otherwise buried in the conductive channel of the transistor. The high reactivity of nanoporous organic field-effect transistors leads to unprecedented ultrasensitive, ultrafast, selective chemical sensing below the 1 ppb level on a hundred millisecond time scale, enabling a wide range of health and environmental applications. Flexible sensor chip for monitoring breath ammonia is further demonstrated; this is a potential biomarker for chronic kidney disease.
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