材料科学
纳米技术
单层
拉曼光谱
制作
涂层
化学工程
光学
医学
物理
替代医学
工程类
病理
作者
Shilong Yu,Huihui Ye,Siyuan Wang,Hailun Tang,Pinyi Wang,Chengjie Pei,Yang Yang,Xiao Huang,Hai Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2024-08-05
卷期号:7 (16): 18801-18810
标识
DOI:10.1021/acsanm.4c02307
摘要
Due to their unique spiral structure and unexpected properties, transition metal dichalcogenide (TMDC) nanoscrolls have been widely explored in the fields of optoelectronic devices, hydrogen evolution catalysis, and gas sensing. Unfortunately, the large-scale fabrication of a closely packed and clean TMDC nanoscroll is still a challenge, which hinders the potential application of TMDC nanoscrolls in optoelectronics. In this work, we report a centrifugal force-assisted method to prepare TMDC nanoscrolls with lengths ranging from tens to hundreds of micrometers by spin-coating poly(ethylene glycol) (PEG) on monolayer TMDC nanosheets, which were grown by chemical vapor deposition. The as-prepared TMDC nanoscrolls were well-characterized by optical microscopy, atomic force microscopy, ultralow-frequency (ULF) Raman spectroscopy, and transmission electron microscopy. The interlayer spacing of the nanoscrolls was found to be as small as 0.53 nm, indicating a closely packed and clean structure. The strong coupling between adjacent layers of the nanoscroll was further confirmed by the appearance of multiple layer-breathing mode peaks in the ULF Raman spectrum. Moreover, the nanoscroll prepared by spin-coating PEG showed much better optoelectronic performance, such as carrier mobility, photoresponsivity, photosensitivity, and external quantum efficiency, than the MoS2 nanoscroll prepared by an ethanol droplet and a monolayer MoS2 nanosheet. We not only provide a facile method for the large-scale preparation of TMDC nanoscrolls with a closely packed and clean structure but also demonstrate the promising potential of TMDC nanoscrolls in optoelectronic devices.
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