Melanin, a biologically occurring pigment featuring broadband optical absorption, ion‐binding affinity including antioxidative and radical‐scavenging properties, and hydration‐dependent electrical conductivity is an ideal natural semiconducting material for interfacing electronics with biological systems. Here, a skin‐mimicking optoelectronic device with a melanin nanoparticle (MNP) dispersion in a protein hydrogel–elastomer hybrid (a mimic of epidermis/dermis layers with melanin) and its application as a dopamine sensor and a UV index meter are reported. MNPs dispersed in water are placed in the elastomer reservoir with integrated silver nanowire electrodes and a transparent silk hydrogel window cover; they exhibit n‐type semiconducting behavior with increased conductivities compared with those of dehydrated MNPs. Enhanced generation of free radicals by light illumination results in an increase of the electrical conductivity. In addition, the artificial optoelectronic skin interacts with its environment through the silk hydrogel window. Applications of the device, including its use as a dopamine sensor and a UV index meter to detect dopamine and UV light passing through the window, are demonstrated. The sensitivity of the dopamine sensor is enhanced by the light illumination.

中文翻译：

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蛋白质水凝胶-弹性体混合物中具有水合黑色素纳米粒子的皮肤启发式，交互式，柔性光电设备。

黑色素是一种生物发生的颜料，具有宽带光吸收，包括抗氧化和自由基清除性能的离子结合亲和力以及与水合有关的导电性，是用于电子与生物系统连接的理想天然半导体材料。在这里，报道了一种模仿皮肤的光电设备，该设备在蛋白质水凝胶-弹性体杂合物中模拟了黑色素纳米颗粒（MNP）分散体（用黑色素模拟表皮/真皮层），并将其用作多巴胺传感器和紫外线指数仪。将分散在水中的MNP放入带有集成银纳米线电极和透明丝水凝胶窗盖的弹性体储槽中；他们表现出ñ与脱水的MNP相比，具有更高电导率的新型半导体行为。通过光照增强自由基的产生导致电导率的增加。另外，人造光电皮肤通过水凝胶丝窗与周围环境相互作用。演示了该设备的应用，包括用作多巴胺传感器和用于检测通过窗户的多巴胺和紫外线的紫外线指数仪。光照射增强了多巴胺传感器的灵敏度。