Fully solution processed low voltage OFET platform for vapour sensing applications

Amine Detection Using Organic Field Effect Transistor Gas Sensors

“…This paper builds on the previous work of our group regarding OFET devices for ammonia sensing where Tate et al [20] and Rahmanudin et al [21] reported low voltage OFETs operating with V GS and V DS of −3 V. These were fabricated based on the organic semiconducting polymer (OSC) poly [2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno] [3,2-b]thiophene) (DPPT-TT) deposited in conjunction with a chemically robust high k gate dielectric material of large areal capacitance, which were capable of detecting and measuring ammonia with high sensitivity. DPP-based materials are emerging as powerful materials that are applicable to a range of organic-semiconductor applications due to excellent planarity and better electron-withdrawing ability over other ptype materials and are reviewed by Liu et al [22].…”

“…The PEN was fully bonded to a glass surface (24 mm × 24 mm × 1 mm from Agar Scientific) with a cool off tape (Plafix Intelimer from Nitta). The process for fabricating an OFET array was previously described [20,27].…”

Biogenic amine sensors using organic π-conjugated materials as active sensing components and their commercialization potential

“…171 Previous work in the Persaud group has also demonstrated the use the solution-processed electrodes from a silver nanoparticle ink in low-voltage OFETs. 168 Therefore, these highly responsive, low-voltage OFET sensors could be developed further to realize applications in smart-food packaging owing to the previously demonstrated fully solution-processed fabrication thereby allowing viable large-scale production, and due to their low driving voltages, they could be powered by batteries or solar cells.…”

“…149,166,167 Persaud et al developed an OFET for the detection of amines using a diketopyrrolopyrrole-thiophene thienothiophene polymer (DPPT-TT) as a hole transporting active layer (Fig. 13) that required a low operating voltage of À3 V. 149,168,169 Upon exposure to amines, DPPT-TT forms ionic species, leading to a decrease in current across the OFET, which functions as the sensing response. The devices were fabricated by first thermally evaporating an aluminum gate electrode on a flexible polyethylene naphthalate substrate to yield a 50 nm film, followed by spin coating a high-k dielectric poly(vinylidenefluoridetrifluoroethylene-chlorofluoroethylene) on top of the gate followed by a low-k dielectric poly(methyl methacrylate) layer, and then gold source and drain electrodes were thermally evaporated directly on the dielectric.…”