Ramazan Özkan^1,2, Mustafa Serdar Genç^1,3,*, İlker Kayali^1,4,5

CMES-Computer Modeling in Engineering & Sciences, Vol.145, No.3, pp. 3349-3380, 2025, DOI:10.32604/cmes.2025.072519 - 23 December 2025

Abstract The optimization of turbine blades is crucial in improving the efficiency of wind energy systems and developing clean energy production models. This paper presented a novel approach to the structural design of small-scale turbine blades using the Artificial Bee Colony (ABC) Algorithm based on the stochastic method to optimize both mass and cost (objective functions). The study used computational fluid dynamics (CFD) and structural analysis to consider the fluid-structure interaction. The optimization algorithm defined several variables: structural constraints, the type of composite material, and the number of composite layers to form a mathematical model. The More >

U. Anwar^a, N. A. Noor^b, S. Mumtaz^c,*, I. M. Moussad¹

Chalcogenide Letters, Vol.22, No.3, pp. 261-276, 2025, DOI:10.15251/CL.2025.223.261

Abstract The combination of two-step synthesis processes is employed for the fabrication of (NiO)(_0.5)/(Fe₂O₃)(_0.5)@C@MoS₂ (NFCM) nanofibers composite through electrospinning and hydrothermal techniques. This nanofiber composite is designed for tunable dielectric materials and electromagnetic interference (EMI) shielding applications. Using impedance spectroscopy, the electrical properties of an NFCM pellet are analyzed using an equivalent circuit model (R₁1<), with a primary focus on the variation of relaxation time with frequency at different temperatures. Utilizing the Mott. variable range hopping (MVRH) model, and small polaronic hopping model, the localization length of the hoping carriers is determined to be 0.98 Å and More >

A. M. Abdel-Daiem^a, M. Ahmed^a,, E. R. Shaaban^b,

Chalcogenide Letters, Vol.22, No.2, pp. 131-142, 2025, DOI:10.15251/CL.2025.222.131

Abstract This paper investigates the impact of reduced graphene oxide (rGO) addition on the structural and optical properties of ZnS nanocomposites. The study began with the synthesis of graphene oxide (GO) through the oxidation of natural graphite powder. This process involved using potassium permanganate in a mixture of sulfuric and phosphoric acids, maintained at 50°C for 48 hours. The reaction was terminated using hydrogen peroxide, followed by purification and drying, yielding 1.5 grams of GO. The preparation of ZnS/GO nanocomposites involved dissolving zinc acetate and varying quantities of GO in water, adjusting the pH, and incorporating… More >

L. Gahramanli^a,b,c,*, M. Muradov^a, G. Eyvazova^a, A. Karimova^a, M. Jafarov^b

Chalcogenide Letters, Vol.22, No.2, pp. 109-121, 2025, DOI:10.15251/CL.2025.222.109

Abstract The study presents nanocomposite materials based on Cd_xZn_1-xS, synthesized as thin films and nanoparticles through two distinct techniques—sonochemical and SILAR synthesis techniques. The characteristics of these materials were investigated using X-ray diffraction (XRD), Ultraviolet spectroscopy (UV-Vis), Fourier-transform infrared (FTIR) spectroscopy, and Scanning Electron Microscopy (SEM). In the sonochemical approach, samples were prepared with three different stabilizers for comparative analysis to determine influence of type of the stabilizers. Meanwhile, the SILAR approach created thin layers with different components (distinctive x value-Cd_xZn_1-xS) at various grown temperatures utilizing polyvinyl alcohol (PVA) as a substrate. At the same time, nanocomposite More >

X. L. Guo^a, Y. F. Zhang^a,*, S. Y. Li^b, Q. Li^b, Q. Hao^c, X. Y. Ran^c, Y. M. Zhao^d

Chalcogenide Letters, Vol.22, No.4, pp. 313-330, 2025, DOI:10.15251/CL.2025.224.313

Abstract MoS₂ has excellent properties but low conductivity, limiting its use in supercapacitors. Carbon’s high conductivity and stability enhance MoS₂’s electrochemical performance and cycling stability. This study prepared MoS₂/C composites via a one-step hydrothermal method, exploring the effects of solvents and carbon content. Deionized water as a solvent resulted in composites with large specific surface areas and good electrochemical properties. Increasing carbon content improved electrochemical performance, peaking at a glucose content of 0.28 mmol, achieving a specific capacitance of 202.6 F/g. However, excessive carbon content led to decreased performance. More >

J. Ahmad^a, Naeem-Ur-Rehman^a,*, M. Shakil^a, M. Saleem^a, K. Mahmood^b, A. Ali^b, M. Imran^c, S. Sharif^d, Hosam O. Elansary^e, S. Mumtaz^f, A. D. Khalid^g

Chalcogenide Letters, Vol.22, No.4, pp. 277-292, 2025, DOI:10.15251/CL.2025.224.277

Abstract This study highlights the superior electrochemical performance of Co₃O₄/Co₃S₄ composite nanoparticles for supercapacitors, compared to individual Co₃O₄ and Co₃S₄, synthesized using sol-gel, co-precipitation, and mechanical alloying methods. The composite combines pseudocapacitance and electric double-layer capacitance, as evidenced by cyclic voltammetry. It exhibits a specific capacitance of 722.9 F/g at 0.5 A/g and an energy density of 73.8 Wh/kg at 405 W/kg. Electrochemical impedance spectroscopy reveals low charge transfer resistance and excellent cycling stability is achieved, with 98.5% capacitance retention after 1500 cycles. These results confirm the composite's potential for high-performance energy storage applications. More >

C. B. Cui^a,b, G. C. Yang^b, Z. Zhang^a,, X. J. Wang^c,

Chalcogenide Letters, Vol.22, No.6, pp. 507-520, 2025, DOI:10.15251/CL.2025.226.507

Abstract This research introduces an innovative aptasensor for detecting alpha-fetoprotein with exceptional sensitivity and specificity, employing a novel MoS₂/Fe₃O₄ composite fabricated through an advanced in-situ growth methodology. The composite exhibited a hierarchical flower-like structure with uniformly distributed Fe3O4 nanoparticles, confirmed by SEM, XRD, and Raman spectroscopy. The MoS₂/Fe₃O₄ composite demonstrated a 66% increase in surface area (7.16 m^²/g) compared to pristine MoS2, enhancing aptamer immobilization and electron transfer efficiency. Electrochemical characterization revealed a significant increase in interfacial resistance upon AFP binding, with a detection limit of 0.3 pg/mL and a dual linear range of 0.001–0.1 ng/mL and 0.1–100 More >

A. X. Yang^a, L. F. Huang^b,*, Y. Y. Liu^c

Chalcogenide Letters, Vol.22, No.7, pp. 649-663, 2025, DOI:10.15251/CL.2025.227.649

Abstract An innovative flexible electronic device was developed by integrating functionalized carbon nanotubes, bismuth sulfide nanostructures, and a polyvinylidene fluoride matrix to create a highly water‐resistant strain detection platform. The fabricated film exhibited a remarkable static water contact angle of 141°, with only a 3–4° reduction after 48 hours of immersion, confirming its excellent hydrophobic performance. Mechanical testing revealed a tensile strength of 43.2 MPa and maintained over 96% of its original strength following 1000 bending cycles, thereby demonstrating outstanding durability under repetitive deformation. Electrical characterization showed an initial conductivity of 12.3 S/m and a baseline resistance near… More >

F. F. Tong^a,*, J. L. Han^b

Chalcogenide Letters, Vol.22, No.8, pp. 719-733, 2025, DOI:10.15251/CL.2025.228.719

Abstract In this study, hierarchical ZnS–CNT hybrids were synthesized via a solvothermal reaction at 180 °C for 48 h, producing ∼200 nm ZnS spheres uniformly anchored onto oxidized multiwalled carbon nanotubes. Structural analyses by XRD confirmed the cubic sphalerite phase, while SEM and TEM revealed a “pearl-necklace” morphology and effective nanoparticle dispersion. XPS spectra verified Zn²⁺ and oxygen-containing surface groups on the composite. Nitrogen adsorption–desorption measurements showed that incorporating CNTs transformed the material’s isotherm from type III to type IV, increasing the BET surface area from 68 to 155 m² /g and introducing mesoporosity. When drop-cast onto More >

Q. Fei^1,*, B. Jin², B. C. Jiang³, J. S. Huang⁴, L. Li⁵

Chalcogenide Letters, Vol.22, No.8, pp. 693-705, 2025, DOI:10.15251/CL.2025.228.693

Abstract An innovative hybrid nanostructure composed of diketopyrrolopyrrole (DPP) oligomers and cadmium sulfide (CdS) nanoparticles was developed to enhance the efficiency of organic– inorganic photovoltaic devices. The DPP-CdS hybrids were synthesized via a solution-phase mixing method, resulting in uniform nanoparticle dispersion along polymer fibrils and strong interfacial coupling. Structural characterization confirmed the coexistence of crystalline CdS domains and partially ordered DPP phases, while spectroscopic analyses indicated notable redshifts and band broadening, evidencing electronic interactions at the interface. The hybrid material displayed significantly broadened light absorption across the 400–700 nm range and an optimized optical bandgap of… More >