Inspired by the powerful photosensitizing properties of the red hair pigments pheomelanins, a photoresponsive cysteine-contg. variant of the adhesive biopolymer polydopamine (pDA) is developed via oxidative copolymn. of dopamine (DA) and 5-S-cysteinyldopamine (CDA) in variable ratios. Chem. and spectral anal. indicate the presence of benzothiazole/benzothiazine units akin to those of pheomelanins. p(DA/CDA) copolymers display -impedance properties similar to those of biol. materials and a marked photoimpedance response to light stimuli. The use of the p(DA/CDA) copolymer to implement a soln.-processed hybrid photocapacitive/resistive metal-insulator-semiconductor (MIS) device disclosed herein is the first example of technol. exploitation of photoactive, red-hair-inspired biomaterials as soft enhancement layer for silicon in an optoelectronic device. The bio-inspired materials described herein may provide the active component of new hybrid photocapacitive sensors with a chem. tunable response to visible light
A Photoresponsive Red-Hair-Inspired Polydopamine-Based Copolymer for Hybrid Photocapacitive Sensors
D'ISCHIA, MARCO
2014
Abstract
Inspired by the powerful photosensitizing properties of the red hair pigments pheomelanins, a photoresponsive cysteine-contg. variant of the adhesive biopolymer polydopamine (pDA) is developed via oxidative copolymn. of dopamine (DA) and 5-S-cysteinyldopamine (CDA) in variable ratios. Chem. and spectral anal. indicate the presence of benzothiazole/benzothiazine units akin to those of pheomelanins. p(DA/CDA) copolymers display -impedance properties similar to those of biol. materials and a marked photoimpedance response to light stimuli. The use of the p(DA/CDA) copolymer to implement a soln.-processed hybrid photocapacitive/resistive metal-insulator-semiconductor (MIS) device disclosed herein is the first example of technol. exploitation of photoactive, red-hair-inspired biomaterials as soft enhancement layer for silicon in an optoelectronic device. The bio-inspired materials described herein may provide the active component of new hybrid photocapacitive sensors with a chem. tunable response to visible lightI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
