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Volume 46 All articles Published: 28 February 2023 Article ID 0040
Phase manipulation of two-dimensional MoS$_2$ nanostructures
M OBAIDA S A HASSAN M N SWELAM I MOUSSA NAHED H TELEB H H AFIFY
Simple hydrothermal process was used to successfully produce two-dimensional (2D) MoS2 powder flower-like nanosheets. The structure of the end product 2D-MoS$_2$ is altered by changing the preparation conditions of reaction time and pH value with a constant autoclave temperature. Via annealing at 500°C, all samples transfer into 2H-MoS$_2$ instead of 1T-MoS$_2$. X-ray diffraction patterns showed that the peaks along (002) planes shifted dramatically from 14.2°to 9.4°. Field emission scanning electron microscopy and high-resolution transmission electron microscopy images revealed that the prepared samples have a flower-like structure composed of spheres of nanosheets with a good polycrystalline structure. The energy gap for pristine and annealed samples is calculated from diffuse reflectance measurements and found to be 1.3 and 0.68 eV, respectively. Differential scanning calorimeter curves showed an impressive exothermic peak at 318°C, suggesting a structural to the stable 2H-MoS$_2$ phase. The Brunauer–Emmett–Teller technique showed rapid decreases in the samples surface area at nearly 48 m$^2$ g$^{–1}$ with the structural transformation.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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