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 >

S. W. Jo^†, I. H. Kim^†, Y. J. Jeong^*

Chalcogenide Letters, Vol.22, No.3, pp. 189-196, 2025, DOI:10.15251/CL.2025.223.189

Abstract Copper selenide has emerged as a promising thermoelectric material due to its unique structural properties and tunable electronic band structure. However, its practical application is hindered by its relatively high thermal conductivity. In this study, we report on the turning of thermal conductivity and thermoelectric energy conversion by preparing a hybrid composite material including nano- and micro-sized Cu₂Se. By employing a hydrothermal synthesis method with cetyltrimethylammonium bromide (CTAB) as a surfactant, we successfully synthesized nano-sized Cu_₂Se particles with uniform size distribution. The incorporation of these nano-sized particles with micro-sized Cu₂Se resulted in a significant reduction in 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 >

U. Anwar^a,, M. Rafi^b, N. A. Noor^c, S. Mumtaz^d,, Hosam O. Elansary^e

Chalcogenide Letters, Vol.22, No.4, pp. 293-311, 2025, DOI:10.15251/CL.2025.224.293

Abstract This study presents a multifunctional NiFe₂O₄@MoS₂ nanomaterial synthesized by co-precipitation and hydrothermal methods. The highly magnified Field emission scanning electron microscopic (FESEM) images expose an excellent interconnected network of MoS₂ petals and NiFe₂O₄ cores. NiFe₂O₄@MoS₂ nanomaterial's crystalline arrangement and phase purity are explored using X-ray diffraction (XRD) analysis. A comprehensive analysis of the NiFe₂O₄@MoS₂ nanomaterial, focusing on its dynamic electrical properties across a temperature zone of 183 K to 373 K. The temperature-dependent impedance and modulus plots versus frequency reveal insights into the material’s conduction and relaxation. Electrical characteristics verify the contribution of electroactive regions, such as grains… More >

T. L. Yang^a, P. Y. Lin^b, Y. S. Fu^c, C. Y. Luo^c, K. C. Hsu^a,*

Chalcogenide Letters, Vol.22, No.7, pp. 625-636, 2025, DOI:10.15251/CL.2025.227.625

Abstract In this study, high-crystallinity zinc sulfide (ZnS) at the nanoscale was synthesized using a combination of electrospinning and hydrothermal techniques. Initially, polyvinyl butyral (PVB)/ZnS composite nanofibers were fabricated via electrospinning. Subsequently, a hydrothermal reaction was employed to induce a dissolution-recrystallization mechanism, enabling the gradual formation of highly crystalline ZnS nanoparticles. The structural, morphological, and compositional characteristics of the ZnS nanoparticles were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Finally, the photocatalytic activity of three different ZnS materials—synthesized via electrospinning, hydrothermal treatment, and hydrothermal-assisted electrospinning—were More >

A. B. Rzayeva^1,2,*, F. E. Abbdullayeva¹, S. C. Imanova¹, S. H. Aliyeva^1,2, S. N. Yasinova^1,2

Chalcogenide Letters, Vol.22, No.11, pp. 965-970, 2025, DOI:10.15251/CL.2025.2211.965

Abstract Lead indium selenide (PbIn2Se₄) is a promising chalcogenide semiconductor for optoelectronic and energy applications. We report a hydrothermal synthesis route using ethylene glycol under moderate conditions (433– 453 K, 7–12 h), yielding up to 85–87%. The product crystallized into a cotton-like morphology composed of nanoand microparticles. Structural and compositional integrity were confirmed by chemical analysis, thermogravimetric analysis, and transmission electron microscopy. These results demonstrate that hydrothermal synthesis provides an efficient and controllable pathway to high-purity PbIn2Se₄, opening opportunities for its use in advanced functional devices. More >

Surelys Ramos-Bell¹, Edson Rayón-Díaz¹, Juan A. Herrera-González², Estefanía Martínez-Batista¹, Rita M. Velázquez-Estrada¹, Porfirio Gutiérrez–Martínez^1,*

Phyton-International Journal of Experimental Botany, Vol.94, No.10, pp. 3145-3156, 2025, DOI:10.32604/phyton.2025.071543 - 29 October 2025

Abstract A significant portion of losses in the fruit and vegetable sector are caused by the necrotrophic fungus Botrytis cinerea, due to its high prevalence in over 1000 crop species. Identifying a technology capable of exclusively inhibiting its growth and development remains challenging; therefore, various treatments have been proposed to act synergistically in preventing the spread of this pathogen. The objective of this study was to evaluate an ultrasound-assisted treatment combined with chitosan to control the development of B. cinerea. In vitro analyses showed that combining temperature, ultrasound, and chitosan inhibited the fungal radial growth by 80%, reduced sporulation, More >

Basima Salman Khalaf^*, Abeer H. Falih, Basim Freegah

Frontiers in Heat and Mass Transfer, Vol.23, No.3, pp. 943-956, 2025, DOI:10.32604/fhmt.2025.065366 - 30 June 2025

Abstract The main purpose of this research is to optimize the hydrothermal performance of a dimpled tube by augmenting the surface area for heat transmission and thermal layer cracking. To achieve that, the impact of different dimple diameters and their distribution along the dimpled tube was investigated numerically using the ANSYS Fluent 2022 R1 software by considering two models, A and B. Both models consist of three regions; the first, second, and third have dimple diameters of 3, 2, & 1 mm, respectively. Model A included an in-line dimple arrangement, while model B involved a staggered… More >

Prans Brazdausks^*, Maris Puke, Guntis Sosins

Journal of Renewable Materials, Vol.13, No.4, pp. 719-730, 2025, DOI:10.32604/jrm.2025.057944 - 21 April 2025

Abstract Oat husks, a byproduct of oat milling operations with limited economic value, present a promising feedstock for biorefinery processes due to their chemical composition. This study investigates the conversion of C5 carbohydrates in oat husks into furfural through hydrothermal pretreatment using various phosphate-based catalysts, including H₃PO₄, NH₄H₂PO₄, NaH₂PO₄, KH₂PO₄, K₂HPO₄ and K₃PO₄ as catalyst. The catalysts’ effectiveness in promoting furfural production was evaluated under identical hydrothermal conditions (treatment time for 60 min at a constant temperature of 170°C and a catalyst amount). Continuous water steam was used to strip furfural from the reaction zone and minimize its degradation.… More > Graphic Abstract

M. Boonkam, P. Tamdee, P. Tongying^*

Chalcogenide Letters, Vol.21, No.4, pp. 335-342, 2024, DOI:10.15251/CL.2024.214.335

Abstract This work presents a facile hydrothermal synthesis method for fabricating a multifunctional composite of copper zinc tin sulfide (CZTS) nanoparticles coated onto sepiolite fibers. Morphological analysis confirms the firm attachment of approximately 10 nm CZTS nanoparticles onto the sepiolite surface. Elemental analysis verifies the presence of constituent elements from both CZTS and sepiolite, with a slight deficiency in Cu and an abundance of Zn observed. The compositional formula of CZTS in the composite is estimated as Cu_1.93Zn_1.05Sn_0.98S_4.04. Notably, the material exhibits a narrow band gap of 1.5 eV, enabling effective utilization of the entire visible light More >