In this paper, we report for the first time, the synthesis of a semiconducting biofilm. Photosynthetic bacterial biofilm has been used to weave together MoS2 nanosheets into an adherent film grown on interdigitated electrodes. Liquid-phase exfoliation of bulk MoS2 powder was used to obtain MoS2 nanosheets. A synchronous-fluorescence scan revealed the presence of two emission maxima at 682nm and 715nm for the MoS2 suspension. Such maxima with bandgap energy 1.82 and 1.73 eV corresponded to the single and double layer of MoS2. The presence of such single and multi-layered structures was confirmed by Raman spectroscopy, FTIR studies, and electron microscopy. The current-voltage (I-V) studies of such a bio-nano hybrid revealed the emergence of the gated nature of the current flow. This Schottky diode like behavior, reported earlier for Graphene-biofilm junctions, is also observed in this case. Gating voltage depended on the composition of the biofilm. The semiconductor biofilms, when studied using electrochemical impedance spectroscopy, revealed characteristic Nyquist and Bode plots, suggesting special circuit-equivalence for each film. While Mos2 was marked with stability with respect to variations in RMS voltage and bias voltage, the graphene biofilm was unique by the absence of any Warburg element.

中文翻译：

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基于石墨烯-MoS2模板和组分依赖性门控行为的半导体细菌生物膜

在本文中，我们首次报道了半导体生物膜的合成。光合细菌生物膜已被用于将MoS2纳米片编织成在指状电极上生长的粘附膜。MoS2块状粉末的液相剥离用于获得MoS2纳米片。同步荧光扫描显示，MoS2悬浮液在682nm和715nm处存在两个发射最大值。带隙能为1.82和1.73 eV的这种最大值对应于MoS2的单层和双层。这种单层和多层结构的存在通过拉曼光谱，FTIR研究和电子显微镜确认。对这种生物-纳米杂化体的电流-电压（IV）研究揭示了电流门控性质的出现。这种肖特基二极管的行为，在这种情况下，也观察到了先前针对石墨烯-生物膜连接的报道。门控电压取决于生物膜的组成。半导体生物膜在使用电化学阻抗谱进行研究时，揭示了特征性的奈奎斯特图和波特图，表明每种膜都有特殊的电路等效性。尽管Mos2在RMS电压和偏置电压方面具有稳定性，但由于没有任何Warburg元素，因此石墨烯生物膜具有独特性。