P. Sateesh^a,*, A. Raveendra^b,*, M. Ashok^c, S. S. Sivaraju^d, K. Umadevi^e, N. Rajeswaran^f

Chalcogenide Letters, Vol.20, No.11, pp. 779-787, 2023, DOI:10.15251/CL.2023.2011.779

Abstract In the present work, SnS thin films were prepared using the CBD technique at room temperature and varying annealing temperaturesfrom300 to 450 °C for photo detector applications. The prepared samples were characterized using different techniques for analyzing the structural, optical, morphological, and photo sensing properties of the samples. From XRD analysis, the diffraction pattern of all the prepared thin films shows the pristine SnS phase of the samples possessing an orthorhombic phase without the presence of any impurity phases. Among the fabricated thin films, the SnS thin film annealed at a temperature of 350 °C… More >

M. N. Abdel-Salam^a, N. Sabry^b, E. S. Yousef^c,d, E. R. Shaaban^a,*

Chalcogenide Letters, Vol.20, No.11, pp. 759-777, 2023, DOI:10.15251/CL.2023.2011.759

Abstract This study focused to prepare poly-crystalline (ZnSe)_1-xCu_x thin films, where x values vary from 0 to 0.1 %. the effect of Cu ratios dopant on structural, phases and optical properties has been investigated. As prepared thin films were deposited onto a cleaning glass substrate under high vacuum conditions (10^-7 mbr) at room temperature using the “ evaporation technique”. The analysis results according to data of the X-ray diffraction technique of all films refer to the growth polycrystalline with hexagonal wurtzite structure of Zn-Se with no presence of any further phases. The changes in numerous parameters such… More >

J. M. Al Abbas^a,*, L. Al Taan^a, M. M. Uonis^b

Chalcogenide Letters, Vol.20, No.12, pp. 883-890, 2023, DOI:10.15251/CL.2023.2012.883

Abstract In this work, cadmium selenide (CdSe) thin films were deposited successfully by spray pyrolysis at different substrate temperatures. The influence of the preparation technique on the optical, morphological, and structural properties of the different substrate temperature CdSe films were investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Visible optical transmission. The XRD analysis reveals that CdSe thin film has hexagonal (wurtzite) and (cubic) crystal structures with different particle sizes depending on the substrate temperature. The SEM image shows uniform and adherent crystals. The optical energy gap was found to be in the More >

A. M. Raduta^a,b, A. M. Panaitescu^a, A. Radu^a, L. Ion^a, V. A. Antohe^a,c, O. Toma^a, S. Iftimie^a, S. Antohe^a,d,*

Chalcogenide Letters, Vol.20, No.12, pp. 871-882, 2023, DOI:10.15251/CL.2023.2012.871

Abstract This paper proposes a comparative study between two sub-micrometric multi-layered photovoltaic cells, based on A_II–B_VI compounds, using different structures for the holes transport and collection electrode. Using the modified form of the Shockley equation, the diode factor, n, the reverse saturation current, I₀, and the series R_s and shunt R_sh resistances were evaluated and their effect on the photovoltaic cells performances were discussed. The photovoltaic performances were analysed by current-voltage characteristics at illumination in standard AM 1.5 conditions, and the specific parameters were determined. More >

G. Amirbekova^a, Zh. Tolepov^a,*, N. Guseinov^a, R. Nemkaeva^a, T. Kuanyshbekov^b, A. Ramazanova^a, D. Tlaubergenova^a

Chalcogenide Letters, Vol.20, No.12, pp. 857-861, 2023, DOI:10.15251/CL.2023.2012.857

Abstract Microcrystalline lead sulfide (PbS) films were synthesized using the chemical deposition method. The films were deposited on pre-cleaned glass substrates and polished silicon wafers. Chemicals of high purity were utilized in the process. The morphology, composition, and structure of the films were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The films exhibited a galena phase with a face-centered cubic structure belonging to the Fm-3m space group. The average grain size was determined using the WilliamsonHall method, revealing a homogenous structure. Raman spectroscopy further confirmed the structural integrity of More >

A. Thamer^a, S. Mohamed^b,*

Chalcogenide Letters, Vol.20, No.12, pp. 847-856, 2023, DOI:10.15251/CL.2023.2012.847

Abstract Using Sol-gel technology, nanocomposite CdS: ZnO thin films with an equal molar ratio of 0.5 M on a glass substrate for water decontamination purposes. The ZnO doping ratios were (0, 1, 3, 5) vol. The ultrastructural, morphological, and optical properties of the prepared thin films were studied using X-ray diffraction (XRD), atomic force microscopy (AFM), and UV-vis spectra. The results indicated that the prepared nanostructured CdS: ZnO thin films contain uniformly spaced crystalline grains of both CdS and ZnO. The ZnO-doped selection ratio and uniform grain distribution produced outstanding photocatalytic and photocatalytic performance. With a More >

SOBHA KOTA^*, RATNAKUMARI ANANTHA, VAYUNANDANA RAO GOVADA, PRADEEP DUMPALA

Journal of Polymer Materials, Vol.40, No.3-4, pp. 285-303, 2023, DOI:10.32381/JPM.2023.40.3-4.10

Abstract The exoskeleton of marine shrimp contains a natural, biocompatible polymer chitin, which is dumped as a waste. The study proposes the sustainable single-pot-extraction of chitosan from the waste and its use in the fabrication of wound-dressings, and thus leverage its piezoelectric, antioxidant, hypoglycaemic and medicinal properties in wound-healing. The Fourier transform infrared spectrum revealed that marine chitosan contains functional groups with N-O, O-H, and CO stretching. Scanning electron micrographs demonstrated the spherical and mesoporous structures of the extracted chitosan. X-ray diffraction analysis showed a semi-crystalline phase of chitosan particles with a mean size of 28.9… More >

Jiefeng Wang¹, Eddie Yin Kwee Ng^2,*, Jianwu Li¹, Yanhao Cao¹, Yanan Huang¹, Liang Li^1,2,3,*

Frontiers in Heat and Mass Transfer, Vol.21, pp. 1-31, 2023, DOI:10.32604/fhmt.2023.045510 - 30 November 2023

Abstract The flow structure of the vortex cooling is asymmetrical compared to the traditional gas turbine leading edge cooling, such as the impingement cooling and the axial flow cooling. This asymmetrical property will affect the cooling performance in the blade leading edge, whereas such effects are not found in most of the studies on vortex cooling due to the neglect of the mainstream flow in the airfoil channel. This study involves the mainstream flow field and the rotational effects based on the profile of the GE E³ blade to reveal the mechanism of the asymmetrical flow structure… More > Graphic Abstract

Zhaohe Dai^1,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09223

Abstract The flexible and clinging nature of ultra-thin films require the understanding of their elastic and adhesive properties in a wide range of circumstances from fabrications to applications. Simultaneously measuring both properties, however, is extremely difficult as the film thickness diminishes to nanoscales. In this talk, I will show our recent work that addresses such difficulties through peeling by vertically pulling thin films off from the substrates (we thus refer to it as “pull-to-peel”). Particularly, we perform in-situ pull-to-peel of graphene and MoS2 films in a scanning electron microscope and achieve simultaneous determination of their Young’s More >

Hongxing Shang^1,*, Xu Liang¹, Shengping Shen¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.25, No.1, pp. 1-1, 2023, DOI:10.32604/icces.2023.09816

Abstract Flexoelectricity is the coupling effect of polarization and strain gradients, which tends to be more pronounced in thin films owing to size dependency. When subjected to in-plane compression, a filmsubstrate system will form complex wrinkle morphologies along with large-area and tunable strain gradients. The wrinkle-induced strain gradients can locally break the inversion symmetry of dielectrics and thus introduce flexoelectric polarization. Here, an electromechanical coupling model is developed to theoretically deal with flexoelectric polar patterns in wrinkled thin films. By analyzing the energy competition of elastic potential and electrostatic energy, the amplitude, wavelength, and critical strain… More >