Plasmon-Enhanced Photocurrent of Photosynthetic Pigment Proteins on Nanoporous Silver
Plasmon-Enhanced Photocurrent of Photosynthetic Pigment Proteins on Nanoporous Silver
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DOI：
10.1002/adfm.201504020
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发表时间：
2016-01-13
影响因子：
19
通讯作者：
Frese, Raoul N.
中科院分区：
文献类型：
--
作者：
Friebe, Vincent M.;Delgado, Juan D.;Frese, Raoul N.
在制造新型太阳能材料的过程中，光合色素蛋白的高量子效率和长电荷分离状态正被利用，通过将它们直接结合到生物电子设备中。在这项工作中，由细菌反应中心光收获1 （RC-LH1）复合物组成的生物杂化光电阴极自组装在纳米结构银衬底上，在1个太阳照射下产生166 a cm（-2）的峰值光电流，在4个太阳照射下最大光电流为416 a cm(-2)，这是迄今为止在裸金属电极上报道的最高光电流。在粗糙的银衬底上观察到每个RC-LH1配合物的光吸收有2.5倍的等离子体增强。这种等离子体相互作用是用共聚焦荧光显微镜评估的，揭示了荧光产量的增加，以及RC-LH1复合物的辐射率，等离子体增强荧光的特征。银底物的纳米结构也提高了蛋白质在连续照明下的稳定性，相对于非结构体银控制几乎提高了一个数量级。由于其易于构建，增加蛋白质负载能力，稳定性和更有效地利用光，这种混合材料是进一步开发等离子体增强生物传感器和生物光伏器件的绝佳候选者。
In a quest to fabricate novel solar energy materials, the high quantum efficiency and long charge separated states of photosynthetic pigment-proteins are being exploited through their direct incorporation in bioelectronic devices. In this work, a biohybrid photocathode comprised of bacterial reaction center-light harvesting 1 (RC-LH1) complexes self-assembled on a nanostructured silver substrate yields a peak photocurrent of 166 A cm(-2) under 1 sun illumination, and a maximum of 416 A cm(-2) under 4 suns, the highest reported to date on a bare metal electrode. A 2.5-fold plasmonic enhancement of light absorption per RC-LH1 complex is observed on the rough silver substrate. This plasmonic interaction is assessed using confocal fluorescence microscopy, revealing an increase of fluorescence yield, and radiative rate of the RC-LH1 complexes, signatures of plasmon-enhanced fluorescence. Nanostructuring of the silver substrate also enhanced the stability of the protein under continuous illumination by almost an order of magnitude relative to a nonstructured bulk silver control. Due to its ease of construction, increased protein loading capacity, stability, and more efficient use of light, this hybrid material is an excellent candidate for further development of plasmon-enhanced biosensors and biophotovoltaic devices.