Applications of molybdenum disulfide (MoS₂) in energy storage devices, solar cells, electrocatalysts, and sensors require good electrical conductivity. However, neither of the current ways to prepare conductive MoS₂ (lithium intercalation and hydrothermal processes) is easily amenable to scale-up. A possible alternative pathway is the modulation of the electronic properties of the semiconducting form of MoS₂ through structural defects. Here, we report the preparation of nanoscale conductive MoS₂ flakes by treating exfoliated 2H-MoS₂ with dilute aqueous hydrogen peroxide at room temperature. Sheet resistance measurements as well as Raman and photoelectron spectroscopy reveal the partial formation of hydrogen molybdenum bronze (H_xMoO₃) and substoichiometric MoO_3–y, which help tune the conductivity of the nanometer-scale thin films without impacting the sulfur-to-molybdenum ratio. We have cast the material into thin film networks to fabricate highly stable chemiresistive pH sensors. Our work introduces a straightforward and safe way of preparing a conductive form of MoS₂ and its application as a low-cost solid-state sensor.

中文翻译：

---

过氧化物诱导的用于固态传感器的纳米厚MoS ₂薄膜电导率的调谐

二硫化钼（MoS ₂）在储能设备，太阳能电池，电催化剂和传感器中的应用要求良好的导电性。但是，目前两种制备导电性MoS _2的方法（锂嵌入和水热工艺）都不容易按比例放大。可能的替代途径是通过结构缺陷调节MoS ₂半导体形式的电子特性。在这里，我们报告通过处理脱落的2H-MoS ₂制备纳米级导电MoS ₂薄片在室温下用稀的过氧化氢水溶液洗涤。薄层电阻测量以及拉曼光谱和光电子能谱揭示了氢钼青铜（H _x MoO ₃）和亚化学计量的MoO _{3– y}的部分形成，这有助于调整纳米级薄膜的电导率，而不会影响硫磺制氢。钼比。我们已将材料浇铸成薄膜网络，以制造高度稳定的化学耐性pH传感器。我们的工作介绍了一种制备导电形式的MoS ₂的简单而安全的方法，并将其用作低成本的固态传感器。