Accepted

Articles recently accepted for publication:

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Green Synthesis, characterization, and Antibacterial Efficiency of Copper Oxide Nanoparticles using Mitragyna speciosa (Korth.) Havil Leaf Extract

Voranuch Thongpool, Sarawut Jaiyen, Akapong Phunpueok, Nuchita Sukprasit and Atipong Bootchanont

Copper oxide nanoparticles (CuO NPs) possess versatile properties that make them valuable in various applications, including electronics, catalysis, sensing, and biomedical fields. However, conventional synthesis routes often require high energy input, hazardous chemicals, and generate environmentally problematic byproducts. In this work, CuO NPs were synthesized through an eco-friendly green method using Mitragyna speciosa (Korth.) Havil leaf extract, whose phytochemicals function as natural reducing and stabilizing agents. The nanoparticles were characterized using UV–visible spectroscopy, FESEM–EDS, and XRD. The optical spectrum exhibited an absorption maximum at ~480 nm, and the corrected Tauc analysis yielded an indirect band gap of 1.57 eV. XRD analysis confirmed the formation of monoclinic CuO with crystallite sizes of 82-98 nm (Scherrer and Williamson–Hall methods), consistent with FESEM particle sizes of 50–80 nm. Antibacterial tests revealed activity against both Escherichia coli and Staphylococcus aureus, with minimum inhibitory concentrations (MICs) of 3.98 × 104 μg/mL and 1.00 × 105 μg/mL, respectively. These results demonstrate that M. speciosa-mediated synthesis offers a viable, cost-effective, and sustainable approach for producing functional CuO nanoparticles, thereby supporting their potential in future environmental and biomedical applications.

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Exploring Zinc Oxide/Cerium Oxide/Indium Tin Oxide Nano Structures as LEDs: An Optical and Structural Investigation

Zehraa Najim Abdul-ameer

Multilayer optoelectronics devices play a crucial role due to their ability to combine the novel properties of dissimilar materials for superior performance leading to enhanced or novel functionalities .This study focuses on designing, fabricating and characterizing a novel nano multilayer structure of Zinc Oxide /Cerium Oxide/ITO in a simple chemical method. X-ray diffraction (XRD) and scanning electron Microscopy (SEM), UV-visible, and photoluminescence were investigated. Optical properties revealed two wide band gap of 3.15 eV for prepared multilayer structure. The multilayer device exhibit broad Photoluminescence peak at 340 eV .Results show significant improvements in charge carrier, optical absorption and quantum efficiency. Addition of Cerium layer enhance conductivity and photocurrent of nano structure by facilitating electron-hole pair separation under photo excitation. These findings highlight the importance of the prepared nano structure multilayer in various optoelectronic technologies such as photodetectors, sensors and light  emitting diodes.