Non-linear thermo-optical properties of WS2 and Au/WS2 Schottky-type nano/hetero-junctions

被引：7

作者：

Mahmudi, Zhila ^{[1
]}

Mortazavi, Seyedeh Zahra ^{[1
]}

Reyhani, Ali ^{[1
]}

Taherkhani, Anahita ^{[1
]}

Parvin, Parviz ^{[2
]}

机构：

[1] Imam Khomeini Int Univ, Fac Sci, Phys Dept, POB 34149-16818, Qazvin, Iran

[2] Amirkabir Univ Technol, Phys Dept, POB 15875-4413, Tehran, Iran

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2022年 / 283卷

关键词：

Au/WS2 Schottky-type nano; hetero-junctions; Z-scan technique; Thermo-optical nonlinear properties; TRANSITION-METAL DICHALCOGENIDES; SILVER NANOPARTICLES; ABSORPTION; MONOLAYER; LAYER; IRRADIATION; EVOLUTION; GRAPHENE;

D O I：

10.1016/j.mseb.2022.115814

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tungsten disulfide (WS2) nanoflakes are synthesized by thermal chemical vapor deposition on a Si/SiO2 sub-strate. Subsequently, WS2 is anchored by Au nanostructures to form Au/WS2 Schottky-type nano/hetero-junc-tions (Au/WS2 NHs), in various gold molar ratios of 1% and 10%, using DC magnetron sputtering. The crystalline structure, surface morphology and optical properties of the samples are investigated by X-ray diffraction, field emission scanning electron microscopy, UV-visible and Raman spectroscopy, respectively. UV-visible spectra reveal the reduction of absorption rate in terms of Au abundance. According to Raman spectra, there is a notable red shifting for A(1g) and E-2g(1) peaks and the elevation of A(1g) to E-2g(1) intensity ratio after Au anchoring. In addition, the Z-scan technique measures the corresponding nonlinear thermo-optical properties indicating a change over from self-focusing to self-defocusing modes in favor of Au/WS2 nanoflakes.

引用

页数：10

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