The group of 2D materials contains almost all the elements of the periodic table. In contrast to the graphene sheet, they are abundant, this creates a variety of electronic properties including metals, semimetals, insulators and semiconductors. Band gaps of these materials are direct or indirect by ranging from ultraviolet to infrared, for this reason, have received much attention for nanoelectronics, optoelectronics and flexible devices.
In this study, by a simple hydrothermal method, which is a bottom-up approach, molybdenum diselenide two-dimensional layers were synthesized. The samples were analyzed by X-ray diffraction spectroscopy, and the compound molybdenum diselenide was confirmed for the samples synthesized, and also with UV-visible spectroscopy (UV-Vis) to study the absorption spectrum and Fluorescence Spectroscopy of Fluorescence (PL) to investigate the properties of fluorescent, the nanoparticles were studied, and found that, by changing the concentration and time of hydrothermal process, the intensity of emission changes. Scanning electron micrographs indicate the size of 100 nanometers for particles synthesized. پرونده مقاله

In this study, carbon nano-micro spheres with tightly controllable size, regular
and perfect shape, high yields and narrow size distribution were prepared simply from
glucose and DI water as precursors using a hydrothermal method. By setting the initial
concentration of glucose solution and changing the hydrothermal process time at a
constant temperature of 160 °C, carbon spheres with various sizes were synthesized in a
sealed autoclave. The relationship between the average carbon sphere size and
hydrothermal process time has been discussed. By increasing the hydrothermal process time
at a constant temperature (160 ° C) and a constant concentration of glucose solution (0.75 molar),
carbon nano-micro spheres were obtained. The diameters of carbon nano-micro spheres
synthesized in this study ranged from 90 nm to 4.5 μm. The obtained carbon nano-micro
spheres were analyzed by different techniques including scanning electron microscopy
(SEM), X-ray diffraction patterns (XRD), energy dispersive spectrometry (EDS) and
Raman analysis. In addition, the existence of surface functional groups on carbon
nano/micro spheres was characterized by Fourier transform infrared (FTIR)
measurements.

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