Abstract：
This study introduces a facile method for the substrate-independent deposition of pheomelanin-like films, revealing unique and promising electrical characteristics. The conventional darkening of a dopamine solution at a basic pH was significantly delayed by the addition of l-cysteine, resulting in a distinctive temporal pattern: an initial quiescent period without apparent color change followed by an abrupt and explosive burst. Surprisingly, within the quiescent period, the deposition of ultrathin and smooth pheomelanin-like films was observed, in addition to rough and thick films formed after the burst. Regardless of thickness or texture, these films exhibited common chemical properties, including moisture-capturing capability and dark- and bright-state conductivities. Particularly noteworthy were consistent photocurrent responses under bias voltage across various pheomelanin-like films, which were not observed in polydopamine films, highlighting the influential role of l-cysteine addition. These findings present a novel avenue for the potential application of pheomelanin-like films in bioelectronics, emphasizing their distinct electrical characteristics and prompting further exploration into their intricate conductive mechanisms. The study contributes to advancing our understanding of melanin-based materials and their potential in diverse scientific and technological domains.
摘要：
这项研究介绍了一种简便的方法，用于不依赖于基底的类pheomelanin薄膜的沉积，揭示独特和有前途的电气特性。碱性pH下多巴胺溶液的常规变黑被添加1-半胱氨酸显着延迟，导致独特的时间模式：最初的静止期没有明显的颜色变化，然后是突然的爆炸性爆发。令人惊讶的是,在静止期,观察到超薄和光滑的类pheomelanin薄膜的沉积，除了破裂后形成的粗糙和厚膜。无论厚度或质地，这些薄膜表现出共同的化学性质，包括水分捕获能力和暗态和亮态电导率。特别值得注意的是，在各种菲莫莫拉宁类薄膜的偏置电压下，一致的光电流响应，在聚多巴胺膜中没有观察到，强调添加l-半胱氨酸的影响作用。这些发现提供了一种新的途径，用于生物电子学的菲莫莫拉宁样薄膜的潜在应用，强调其独特的电气特性，并促使进一步探索其复杂的导电机制。这项研究有助于提高我们对黑色素基材料及其在不同科学和技术领域的潜力的理解。
