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PANI-PAAMPSA patterning schemes. Hydrophobic patterns can be generated by (a) microcontact printing OTS or (b) the selective removal of hydrophobic molecules from a uniformly coated substrate. An aqueous PANI-PAAMPSA is then directly spun cast on the treated substrate. PANI-PAAMSPA selectively adsorbs in the hydrophilic regions to create a conductive pattern.
(Color online) (a) A scanning electronic micrograph revealing hydrophilic (dark) and hydrophobic (bright) regions after microcontact printing OTS on a silicon substrate. (b) An optical micrograph after spin casting PANI-PAAMPSA solution. PANI-PAAMPSA (dark) selectively adsorbs in the hydrophilic regions. (c) An optical micrograph revealing 5 μm PANI-PAAMPSA dots uniformly patterned on a silicon dioxide substrate. (d) The resistance of PANI-PAAMPSA measured along a continuous patterned wire (corresponding optical micrograph in inset); the inverse slope yields an average conductivity of 0.2 S/cm.
characteristics of bottom-contact pentacene TFTs with PANI-PAAMPSA electrodes: PANI-PAAMPSA electrodes were patterned (a) by stamp-and-spin cast and (b) using the scheme outlined in Fig. 1(b) where the dielectric surface was first treated with HMDS . We increase the gate voltage from 0 to −40 V in increments of −10 V.
characteristics of bottom-contact pentacene TFTs with PANI-PAAMPSA (solid squares) and gold electrodes (open circles) in the linear regime. These devices have similar dimensions and exhibit comparable mobilities. The gate voltage was increased from −10 to −50 V in increments of −10 V. Hooking is only observed in reference devices with gold electrodes.
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