厚度可调的MoS2量子点薄层的直接合成：光学，结构和电学性质及其在析氢中的应用,Nano Energy

当前位置： X-MOL 学术 › Nano Energy › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

厚度可调的MoS2量子点薄层的直接合成：光学，结构和电学性质及其在析氢中的应用
Nano Energy ( IF 16.8 ) Pub Date : 2017-03-25 08:59:42
Dhanasekaran Vikraman, Kamran Akbar, Sajjad Hussain, Geonwook Yoo, Ji-Yun Jang, Seung-Hyun Chun, Jongwan Jung, Hui Joon Park

我们报告了双层或几层结晶二硫化钼（MoS ₂）薄层的层厚度可调直接合成生长方法。首次针对基于量子点（QD）的MoS ₂层使用（NH ₄）₆ Mo ₇ O ₂₄和硫脲（CH ₄ N ₂S）作为前体。使用该方法，可以保持大面积薄层的均匀性，并且在制造各种原子薄层结构时，对各种基板的适用性可以提供很大的机会。系统地研究了MoS ₂ QD层的结构和光学性质。拉曼光谱，原子力显微镜和透射电镜分析证实了连续的和结晶的双层，三层和很少层的MoS _2的形成。它们的电性能通过底栅FET进行评估，获得的场效应迁移率值为〜1.06cm ² V ^-1 s ^-1，电流开/关比约为10 ⁵。特别是MoS ₂制成由晶粒的QD结构组成的薄膜显示出新颖的电催化性能。事实证明，Au / Si上的MoS ₂ QDs是用于氢气析出反应的优良电催化剂，具有Tafel斜率（94mVdecade ^-1），交换电流密度（1.91×10 ^-1 mAcm ^-2）和20h的长期耐久性。我们的方法为功能性MoS ₂层的设计和合成开辟了新途径，以进行能量收集。

"点击查看英文标题和摘要"

Direct synthesis of thickness-tunable MoS2 quantum dot thin layers: Optical, structural and electrical properties and their application to hydrogen evolution

We report a layer thickness-tunable direct synthesis growth method for bi- to few-layer crystalline molybdenum disulfide (MoS₂) thin layers. For the first time, a facile, cost effective, and mass-scalable direct synthesis approach, based on a chemical bath deposition, is designed for quantum dot(QD)-based MoS₂ layers using (NH₄)₆Mo₇O₂₄ and thiourea (CH₄N₂S) as precursors. Using this process, the uniformity of large area thin layer can be retained, and the applicability to various substrates can provide great opportunities in the fabrication of various atomically thin layered structures. The structural and optical properties of the MoS₂ QD layers are systematically investigated. Raman, AFM and TEM analyses confirm the formation of continuous and crystalline bi-, tri- and few-layered MoS₂. Their electrical properties are evaluated by bottom-gate FETs, and a field-effect mobility value of ~1.06cm² V⁻¹ s⁻¹ and a current on/off ratio in the order of ~ 10⁵ are obtained. Particularly, MoS₂ prepared as a thin film consisting QD structures of grains shows novel electrocatalytic property. MoS₂ QDs on Au/Si are proven to be excellent electrocatalysts for hydrogen evolution reaction, featured by Tafel slope (94mVdecade⁻¹), exchange current density (1.91×10^-1 mAcm⁻²) and long-term durability for 20h. Our approach opens new avenues for the design and synthesis of functional MoS₂ layers for energy harvesting.

更新日期：2017-03-26

点击分享

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南