Optical properties of ZnS: Ce nanocrystals prepared by hydrothermal method

Xin, Mei; Liao, Lijuan; Han, Fei

doi:10.1016/j.jlumin.2021.118074

Cited by 16 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plot, Vs is the UDEDM plot 57 of the prepared samples with different S/Zn Molar ratios, shown in Fig. 1 d. The Y-intercept gives the average crystallite size, and the values are 2.9 nm, 2.8 nm, 38.9 nm, 55.2 nm, and 46.2 nm for ZnS0.67, ZnS1, ZnS1.5, ZnS2 and ZnS3 respectively.…”

Section: Methodsmentioning

confidence: 99%

Defect engineering for enhanced optical and photocatalytic properties of ZnS nanoparticles synthesized by hydrothermal method

Jubeer,

Manthrammel,

Subha

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Defect engineering is a promising method for improving light harvesting in photocatalytic materials like Zinc sulphide (ZnS). By altering the S/Zn molar ratio during hydrothermal processes, Zn and S defects are successfully introduced into the ZnS crystal. The band structures can be modified by adding defects to the crystal structure of ZnS samples. During the treatment process, defects are formed on the surface. XRD and Raman studies are used for the confirmation of the crystallinity and phase formation of the samples. Using an X-ray peak pattern assessment based on the Debye Scherer model, the Williamson-Hall model, and the size strain plot, it was possible to study the influence of crystal defect on the structural characteristics of ZnS nanoparticles. The band gap (Eg) values were estimated using UV–Vis diffuse spectroscopy (UV–Vis DRS) and found that the Eg is reduced from 3.28 to 3.49 eV by altering the S/Zn molar ratio. Photoluminescence study (PL) shows these ZnS nanoparticles emit violet and blue radiations. In keeping with the results of XRD, TEM demonstrated the nanoscale of the prepared samples and exhibited a small agglomeration of homogenous nanoparticles. Scanning electron microscopy (SEM) was used to examine the surface morphology of the ZnS particles. Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) and X-ray photoelectron spectroscopy (XPS) were used to evaluate and validate the elemental composition. XPS results indicate the presence of defects on the prepared ZnS nanoparticles. For the investigation of vacancy-dependent catalytic activity under exposure to visible light, defective ZnS with different quantities of Zn and S voids are used as catalysts. The lowest S/Zn sample, ZnS0.67 and the highest S/Zn sample, ZnS3, show superior photocatalytic activity.

show abstract

Section: Methodsmentioning

confidence: 99%

Defect engineering for enhanced optical and photocatalytic properties of ZnS nanoparticles synthesized by hydrothermal method

Jubeer,

Manthrammel,

Subha

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Size-strain analysis gives less importance to the values from the high inclination reflections, which have lower precision. In this plot, the strain portrait is illustrated by the Gaussian function and the size of the crystallite by the Lorentz function is shown in equation ( 12) [23,42]:…”

Section: Size-strain Plotmentioning

confidence: 99%

Microwave‐assisted synthesis of praseodymium (Pr)‐doped ZnS QDs such as nanoparticles for optoelectronic applications

et al. 2023

View full text Add to dashboard Cite

Pr‐doped ZnS nanoparticles were synthesised using a low‐cost microwave assisted technique and investigations on their structure, morphology, optical properties, Raman resonance, dielectric properties and luminescence were conducted. Broad XRD peaks suggested the formation of low‐dimensional Pr‐doped ZnS nanoparticles with a cubic structure which was validated by TEM/HRTEM analysis. The energy gaps were identified using diffuse reflectance spectroscopy and it was found that the values varied between 3.54 and 3.61 for different samples. Vibrational experiments on Pr doped ZnS nanoparticles revealed significant Raman modes at ~ 270 and ~350 cm ‐1 associated to TO and LO modes that are shifted to lower wavenumbers, indicating phonon confinement in the synthesised products. The PL spectra of all samples demonstrate that the pure and Pr doped ZnS nanoparticles are three level laser active materials. EDX and mapping study confirms the homogeneous presence of Pr in ZnS. TEM study shows that the particles are of very small size and cubic phase. The samples have high dielectric constant values between 13 and 24 and low loss values, according to the dielectric analysis. With an increase in frequency and a change in the Pr content of ZnS, an intense peak can be seen in the PL spectra at a wavelength of 360 nm, and some other peaks observed correspond to the transition of Pr 3+. The produced NPs are appropriate for optoelectronic applications due to their short dimension, high energy gap, high dielectric constant and low loss values.

show abstract

“…Figure 3(d) confirms the presence of these two phases by the spacing with different orientations; these spacings have distances of 3.1 and 2.61 Å, which correspond to the (111) plane of the cubic phase of ZnS and the (002) plane of the hexagonal phase of ZnO, respectively. 19,20 The growth of the (111) plane of the ZnS phase and the (002) plane of the wurtzite phase of ZnO can bring the benefit of improving the photocatalytic activity of the material because these planes are considered as active and because the exposure of these planes can lead to a better performance in hydrogen production. 17…”

Section: Transmission Electron Microscopy (Tem) and Highresolution Te...mentioning

confidence: 99%

One‐step synthesis of ZnS/ZnO using HMDA as precursor and active part for high photocatalytic hydrogen production

García‐Mendoza

Rivera

Álvarez-Lemus

et al. 2022

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: The use of organic molecules to improve the performance of semiconductors (such as using ZnS in hydrogen production) has been widely studied. This work studies the formation of a photocatalyst formed by ZnS/ZnO anchored to an organic molecule (hexamethylenediamine) under different amounts of the organic material and its performance in hydrogen production is evaluated. RESULTS:The materials were synthesized by the precipitation method, forming ZnS/ZnO composite, 3HMDA and 9HMDA materials showed flower-like structure. The 6HMDA material showed a nanotube like structure and high surface area . Likewise, the anchoring of the organic material forming stacked lamellae is confirmed. Regarding hydrogen production, the most active material was 6HMDA, which showed an excellent performance, producing 3281 ∼moles after 5 h of reaction with a production rate of 12 916 ∼moles h −1 g -1 ; 6HMDA increased the effectiveness with respect to ZnS by a factor of 4.3, while the 9HMDA material increased it 1.5 times. CONCLUSION:The organic material and the ZnS/ZnO work together to improve the photocatalytic activity and stability of the material, increasing hydrogen production under UV light. These results show that it is possible to obtain an efficient material with excellent photocatalytic performance by a relatively simple synthesis method.

show abstract

Optical properties of ZnS: Ce nanocrystals prepared by hydrothermal method

Cited by 16 publications

References 36 publications

Defect engineering for enhanced optical and photocatalytic properties of ZnS nanoparticles synthesized by hydrothermal method

Defect engineering for enhanced optical and photocatalytic properties of ZnS nanoparticles synthesized by hydrothermal method

Microwave‐assisted synthesis of praseodymium (Pr)‐doped ZnS QDs such as nanoparticles for optoelectronic applications

One‐step synthesis of ZnS/ZnO using HMDA as precursor and active part for high photocatalytic hydrogen production

Contact Info

Product

Resources

About