期刊
ADVANCED FUNCTIONAL MATERIALS
卷 24, 期 45, 页码 7161-7172出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201401377
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- Italian MIUR (PRIN)
Inspired by the powerful photosensitizing properties of the red hair pigments pheomelanins, a photoresponsive cysteine-containing variant of the adhesive biopolymer polydopamine (pDA) is developed via oxidative copolymerization of dopamine (DA) and 5-S-cysteinyldopamine (CDA) in variable ratios. Chemical and spectral analysis indicate the presence of benzothiazole/benzothiazine units akin to those of pheomelanins. p(DA/CDA) copolymers display impedance properties similar to those of biological materials and a marked photoimpedance response to light stimuli. The use of the p(DA/CDA) copolymer to implement a solution-processed hybrid photocapacitive/resistive metal-insulator-semiconductor (MIS) device disclosed herein is the first example of technological 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 chemically tunable response to visible light.
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