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首页> 外文期刊>Nanotechnology >Gold nanoparticle-embedded silk protein-ZnO nanorod hybrids for flexible bio-photonic devices
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Gold nanoparticle-embedded silk protein-ZnO nanorod hybrids for flexible bio-photonic devices

机译：用于柔性生物光子器件的金纳米粒子嵌入式丝蛋白-ZNO纳米棒杂交机

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Silk protein has been used as a biopolymer substrate for flexible photonic devices. Here, we demonstrate ZnO nanorod array hybrid photodetectors on Au nanoparticle-embedded silk protein for flexible optoelectronics. Hybrid samples exhibit optical absorption at the band edge of ZnO as well as plasmonic energy due to Au nanoparticles, making them attractive for selective UV and visible wavelength detection. The device prepared on Au-silk protein shows a much lower dark current and a higher photo to dark-current ratio of similar to 10(5) as compared to the control sample without Au nanoparticles. The hybrid device also exhibits a higher specific detectivity due to higher responsivity arising from the photo-generated hole trapping by Au nanoparticles. Sharp pulses in the transient photocurrent have been observed in devices prepared on glass and Au-silk protein substrates due to the light induced pyroelectric effect of ZnO, enabling the demonstration of self-powered photodetectors at zero bias. Flexible hybrid detectors have been demonstrated on Au-silk/polyethylene terephthalate substrates, exhibiting characteristics similar to those fabricated on rigid glass substrates. A study of the performance of photodetectors with different bending angles indicates very good mechanical stability of silk protein based flexible devices. This novel concept of ZnO nanorod array photodetectors on a natural silk protein platform provides an opportunity to realize integrated flexible and selfpowered bio-photonic devices for medical applications in near future.
机译：丝蛋白已被用作用于柔性光子器件的生物聚合物底物。这里，我们证明了柔性光电上Au纳米颗粒包埋的丝蛋白的ZnO纳米棒阵列杂交光电检测器。混合样品显示在ZnO的带边缘的光学吸收以及等离激元能量由于金纳米粒子，这使它们用于选择性UV和可见波长检测吸引力。在设备上的Au-丝蛋白示出了低得多的暗电流和较高的照片，以类似的暗电流比为10（5）相比于没有的Au纳米颗粒的对照样品制备。混合设备还表现出更高的比探测由于从由金纳米粒子的光产生的空穴俘获引起的更高的响应度。在设备中被观察到的光电流瞬态具有尖锐的脉冲在玻璃和Au-丝蛋白质底物来制备，由于ZnO的光诱导的热电效应，使自供电光电探测器的示范在零个偏压。柔性混合探测器已被证明在Au-丝/聚对苯二甲酸乙酯基片，表现出类似那些在刚性玻璃衬底上制造的特征。具有不同弯曲角度的光电检测器的性能的研究表明丝蛋白基于柔性器件的非常良好的机械稳定性。 ZnO纳米棒阵列探测器对天然丝蛋白平台，这种新颖的概念提供了实现在不久的将来，医疗应用集成灵活selfpowered生物光子器件的机会。

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