Conducting polymer percolation gas sensor on a flexible substrate

Abstract

Electrochemically bridging the gap between metallic IDE fingers at the percolation threshold for highly sensitive chemiresistors on PET flexible substrates.

An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring

“…The use of conductive polymers (CP) and its derivatives such as poly (3,4-ethylenedio xythiophene) (PEDOT), polypyrrole (PPy), polyaniline (PANI), and polythiphene as the active layer in gas sensors dates back to the early 1980s [41] and has found significant use in several applications [38,[41][42][43]. When a redox-active gas interacts with the CP, it undergoes doping/de-doping, resulting in redox reactions.…”

ANFO vapour detection with conducting polymer percolation network sensors and GC/MS

“…25 Using chronoamperometry, the potential between the working electrode and the reference electrode was kept at 1.0 V for 50 s, typically resulting in sensors with a starting resistance between 3 kΩ and 25 kΩ, which we know from previous work with Au IDEs on flexible PET substrates corresponds to the percolation region for PPy percolation networks. 17 After PPy growth the sensors were p-doped using chronoamperometry, by holding them at 1.0 V in a monomerless 0.1 M LiClO 4 solution in acetonitrile for 60 s.…”

“…Previous work, using polypyrrole (PPy) percolation networks between interdigitated Au electrodes with a 100 μm separation on a flexible PET substrate for NH 3 detection, has shown that with this approach the sensitivity is significantly improved. 17 Sensors based on a percolation network of CPs operate in the steep part of the percolation curve, where a small number of interactions between the analyte gas and the CP lead to a large resistance change, resulting in a high sensitivity. Additionally, compared to the sensors described in ref.…”

Electrohydrodynamic jet printed conducting polymer for enhanced chemiresistive gas sensors

“…Examples of such devices have been produced. 2,12,13 Existing preparation techniques for depositing conducting polymers are based on inkjet printing 14,15 , spin-coating, drop-casting 16 , electrospinning 17 , Langmuir-Blodgett films 18 and electrochemical polymerization [19][20][21][22] . Most of these techniques require a significant amount of polymer to bridge the electrodes in a chemiresistor type gas sensor and do not allow discrete conducting polymer bridges.…”