Phase Transformation From Amorphous to Crystalline in MoS2 Nanosheets Prepared via Desulfurization of MoS3: Investigation of Optical and Structural Properties

Applied Research Pub Date : 2025-07-13 DOI:10.1002/appl.70026

Rahim Lotfi Orimi, Ensieh Esfandyari

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Abstract

This study reports the synthesis of amorphous and polycrystalline molybdenum disulfide (MoS₂) nanostructures. Amorphous MoS₂ nanoparticles were synthesized by desulfurizing MoS₃ under hydrazine vapor at 360°C. Polycrystalline nanosheets were obtained by annealing at 800°C. For comparison, crystalline MoS₂ nanoparticles were also synthesized via a hydrothermal method. The structural and optical properties were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), photoluminescence (PL), and UV-visible spectroscopy. UV-visible analysis revealed a decrease in the bandgap energy from approximately 2.4 to 2.0 eV, attributed to the change in synthesis method. Annealing significantly influenced the crystallographic and optical properties of MoS₂. The initial desulfurized MoS₃ sample exhibited an amorphous structure, while both the annealed and hydrothermally prepared samples showed a polycrystalline structure.

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二硫化钼脱硫制备的二硫化钼纳米片从非晶到晶的相变：光学和结构性质研究

本文报道了非晶和多晶二硫化钼（MoS2）纳米结构的合成。采用水合肼蒸汽在360℃下对MoS3进行脱硫的方法合成了非晶态MoS2纳米颗粒。在800℃下退火得到多晶纳米片。为了比较，还通过水热法合成了结晶型二硫化钼纳米颗粒。利用x射线衍射（XRD）、场发射扫描电镜（FESEM）、能量色散x射线能谱（EDX）、光致发光（PL）和紫外可见光谱对其结构和光学性质进行了表征。紫外-可见分析显示，由于合成方法的改变，带隙能量从大约2.4 eV下降到2.0 eV。退火对二硫化钼的晶体学和光学性能有显著影响。初始脱硫的MoS3样品为非晶结构，而退火和水热制备的样品均为多晶结构。

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来源期刊

Applied Research

CiteScore

0.70

自引率

0.00%

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