B4.2 Percolation Networks of Polypyrrole for Vapour Sensing of Improvised Explosive Devices
- SMSI 2020
(did not take place because of Covid-19 virus pandemic)
- SMSI 2020 - Sensors and Instrumentation
- B4 Gas Sensors for Safety and Security
- M. Lefferts, B. Armitage, K. Murugappan, M. Castell - University of Oxford, Oxford (United Kingdom)
- 119 - 120
Using chemiresistive vapour sensors based on a percolation network of polypyrrole (PPy) significantly increases the sensitivity compared to more traditional PPy thin film based sensors. At the optimum, close to the percolation threshold, an LOD of 18 ±2 ppb ammonia was achieved. The sensors are also highly sensitive to vapour emitted by the ammonium nitrate/fuel oil (ANFO) mixture, which is common-ly used in improvised explosive devices (IEDs).