Swift tuning from spherical molybdenum microspheres to hierarchical molybdenum disulfide nanostructures by switching from solvothermal to hydrothermal synthesis route

Abstract

Herein, we report the synthesis of metallic molybdenum microspheres and hierarchical MoS2 nanostructures by facile template-free solvothermal and hydrothermal approach, respectively. The morphological transition of the Mo microspheres to hierarchical MoS2 nanoflower architectures is observed to be accomplished with change in solvent from ethylenediamine to water. The resultant marigold flower-like MoS2 nanostructures are few layers thick with poor crystallinity while spherical ball-like molybdenum microspheres exhibit better crystalline nature. This is the first report pertaining to the synthesis of Mo microspheres and MoS2 nanoflowers without using any surfactant, template or substrate in hydro/solvothermal regime. It is opined that such nanoarchitectures of MoS2 are useful candidates for energy related applications such as hydrogen evolution reaction, Li ion battery and pseudocapacitors. Inquisitively, metallic Mo can potentially act as catalyst as well as fairly economical Surface Enhanced Raman Spectroscopy (SERS) substrate in biosensor applications.

The efficient and green synthesis of biodiesel from crude oil without degumming catalyzed by sodium carbonate supported MoS2

“…Thus, the great crystallinity of MoS 2 was obtained by the hydrothermal method. 23 Aer the loading of sodium carbonate, peaks attributed to MoS 2 did not signicantly shi, and no peak attributed to sodium carbonate was observed, indicating the stable crystal structure of MoS 2 . The overall diffraction peaks were slightly broadened with the loading of sodium carbonates, implying the uniform dispersion of sodium carbonate on the surface of MoS 2 .…”

Molybdenum Oxide Electrochromic Materials and Devices

“…水/溶剂热法在物理、化学、生物、材料等多 个领域均有应用，其设备原理图与水/溶剂热制备 的一般步骤 [40] 如图 3 所示。水/溶剂热法是指在密 闭的压力容器中，以水/非水溶剂的溶液通过加热 使得反应物之间发生有关的化学反应，从而生成 特定产物的方法 [41] 。通过调节水/溶剂热反应温度、 反应时间、反应物的比例等条件可以达到控制薄 膜厚度和均匀性的目的。水/溶剂热法常用于制备 过渡金属氧化物(TMO) [42][43] ，其优势是操作简单， 合成的产物尺寸可控、分散性好、成膜均匀。同 时， 水/溶剂热是在无外界干扰的密闭容器中进行， 制备出的产物纯度高，避免了环境的污染。 图 3 水/溶剂热法应用领域(a),水/溶剂热法设备原理图(b)和水/溶剂热制备的一般步骤(c) [40] Fig. 3 Application field of water/solvothermal method (a), schematic diagram of water/solvothermal method equipment (b), and general steps of water/solvothermal preparation (c) [40] 姚斌等 [44] 使用水热法合成了超长 MoO3 纳米 带，具有良好的电化学性能。魏阳课题组 [45] 通过 水热法制备出纳米棒和纳米颗粒两种不同形貌的…”