Shewanella oneidensis MR-1 is a dissimilatory metal-reducing bacterium capable of reducing various metal and sulfur compounds and precipitating them in nanoparticulate form. Here, we report the synthesis of molybdenum disulfide nanomaterials at the site of S. oneidensis biofilms grown in the presence of molybdenum trioxide and sodium thiosulfate. Samples from the growth medium were imaged using scanning electron microscopy and characterized using transmission electron microscopy, energy-dispersive x-ray spectroscopy, absorbance spectroscopy, and x-ray diffraction. These methods revealed the presence of molybdenum disulfide nanoparticle aggregates 50–300 nm in diameter with both hexagonal and rhombohedral polytypes. As a biosynthesis method for molybdenum sulfide, the use of S. oneidensis offers the advantage of significantly reduced heat and chemical solvent input compared to conventional methods of synthesizing molybdenum disulfide nanoparticles.

中文翻译：

---

Shewanella oneidensis MR-1 生物膜中二硫化钼纳米颗粒的合成和表征。

Shewanella oneidensis MR-1 是一种异化金属还原细菌，能够还原各种金属和硫化合物并将它们以纳米颗粒形式沉淀。在这里，我们报告了在三氧化钼和硫代硫酸钠存在下生长的S. oneidensis生物膜部位合成二硫化钼纳米材料。来自生长培养基的样品使用扫描电子显微镜成像，并使用透射电子显微镜、能量色散 X 射线光谱、吸收光谱和 X 射线衍射表征。这些方法揭示了二硫化钼纳米颗粒聚集体的存在，直径为 50-300 nm，具有六边形和菱形多型。作为硫化钼的生物合成方法，使用与合成二硫化钼纳米粒子的传统方法相比，S. oneidensis具有显着减少热量和化学溶剂输入的优势。