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Highly sensitive NH3 detection based on organic field-effect transistors with tris(pentafluorophenyl)borane as
Weiguo Huang1, Kalpana Besar, Rachel LeCover
1Department of Materials Science and Engineering, Johns Hopkins University, 206 Maryland Hall, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
Journal of the American Chemical Society
|September 1, 2012
Summary
Researchers enhanced organic field-effect transistor (OFET) ammonia (NH3) detection using tris(pentafluorophenyl)borane (TPFB). This breakthrough achieved unprecedented sensitivity and memory effects in semiconductor-based gas sensors.
Area of Science:
- Materials Science
- Chemical Sensors
- Organic Electronics
Background:
- Organic field-effect transistors (OFETs) are promising for gas sensing applications.
- Improving the sensitivity and selectivity of OFET-based sensors remains a key challenge.
- Ammonia (NH3) detection is critical for environmental monitoring and industrial safety.
Purpose of the Study:
- To enhance the ammonia (NH3) response of organic field-effect transistors (OFETs).
- To investigate the role of tris(pentafluorophenyl)borane (TPFB) as a receptor additive.
- To evaluate the sensitivity, selectivity, and memory characteristics of the modified OFETs.
Main Methods:
- Incorporation of tris(pentafluorophenyl)borane (TPFB) into OFET semiconductor layers.
- Testing OFET response to varying concentrations of ammonia (NH3).
- Comparative analysis with OFETs using triphenylmethane (TPM) or triphenylborane (TFB) additives.
- Assessment of selectivity against common organic vapors and long-term storage stability.
- Evaluation of exposure memory by storing exposed devices at low temperatures (-30 °C).
Main Results:
- OFETs with TPFB additive achieved a detection limit of 350 ppb for NH3, the highest reported for semiconductor films.
- A concentration of 450 ppb v/v NH3 was reliably detected.
- TPM and TFB additives did not yield significant improvements in sensitivity.
- The TPFB-modified OFETs exhibited good selectivity towards common organic vapors.
- The devices demonstrated considerable stability during storage.
- Excellent memory of exposure was achieved by storing devices at -30 °C, a novel capability for OFETs.
Conclusions:
- Tris(pentafluorophenyl)borane (TPFB) significantly enhances the sensitivity of organic field-effect transistors (OFETs) for ammonia (NH3) detection.
- These TPFB-functionalized OFETs represent a new benchmark in semiconductor-based gas sensing performance.
- The demonstrated storage memory capability opens new avenues for advanced sensor applications.
