Molybdenum disulfide (MoS) has received considerable attention due to its promising biomedical technologies, foldable displays and optoelectronic properties. In this work, the vacuum synthetic technology was employed to grow four-layer MoS from sulfur powder and molybdenum trioxide (MoO), after holding in a threaded crucible for 30 min at 1273 K. One characteristic of this process is to increase the pressure of sulfur by using the threaded crucible. The composition and morphology of the products depend upon the synthetic temperature. The vacuum-prepared MoS was used as a precursor for mono- or few-layers materials by ultrasonic treatment in isopropanol solution (IPA). The structure, morphology, composition, band gap and photoluminescence (PL) of MoS with mono- and few-layers were investigated in detail. This work has a great impact on the tunable layers and bandgap of MoS.

中文翻译：

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层状二硫化钼真空合成及结构调控的新方法

二硫化钼（MoS）因其具有前景的生物医学技术、可折叠显示器和光电特性而受到广泛关注。在这项工作中，采用真空合成技术，在螺纹坩埚中于 1273 K 下保持 30 分钟后，以硫粉和三氧化钼 (MoO) 为原料，生长出四层 MoS。该过程的一个特点是增加使用螺纹坩埚来制硫。产物的组成和形态取决于合成温度。通过在异丙醇溶液（IPA）中进行超声波处理，真空制备的MoS可用作单层或多层材料的前驱体。对单层和少层MoS的结构、形貌、组成、带隙和光致发光（PL）进行了详细研究。这项工作对MoS2的可调谐层数和带隙有很大影响。