Trong bài báo này, ảnh hưởng của kích thước hạt lên tính chất từ (từ độ MS, dị hướng hiệu dụng Keff) và quang (độ rộng vùng cấm) các nano Fe3O4 (FO) được khảo sát. Các FO tổng hợp bằng phương pháp đồng kết tủa với nhiệt phản ứng khác nhau 50°C, 60°C, 70°C 80°C, tương lần lượt là 8,7 nm, 10,1 10,4 nm 11,9 nm. khi MS tăng 51,65 emu/g xuống 64,56 thì giá trị chúng giảm 18,26 kJ/m3 đến 12,49 theo c...

Dielectric-metal-dielectric (DMD) films exhibit high optical transmittance and conductivity. In recent years, the application of these DMD materials to antennas has been actively investigated. However, radiation efficiency is less than 70%, so their performance as remains a challenge. This study investigated electrical properties indium tin oxide (ITO)/Ag/ITO, basic structural monopole antenna ...

We design an ultra-compact active hybrid plasmonic ring resonator for lasing applications at deep sub-wavelength scale. The combined contributions of hybrid plasmonic mode, circular-shaped cross section of nanowire, and ring resonator structure with round-trip whispering-gallery cavity, benefit reduced metallic absorption loss, tight mode confinement, enhanced cavity feedback, achieving high qu...

The effects of a pulsed low frequency electromagnetic field were investigated on photoluminescence of well characterized water and prepared under controlled conditions (container, atmospheric, electromagnetic, and acoustic environments). When reference water samples were excited at 260 nm, two wide emission bands centered at 345 nm (3.6 eV) and 425 nm (2.9 eV) were observed. By contrast under 3...

We have used Lithium Aluminum Hydroxide reducing method of silver nitrate to prepare heterogeneous silver-silica nanocomposite particles with thiol and amino groups serving to bind the Ag nanoparticles to the surfaces of the SiO2 nanoparticles. We examined products of these reductions using FTIR, SEM, XRD and UV-vis. spectroscopy. The SiO2 nanoparticles had diameters rangi...

We have used Lithium Aluminum Hydroxide reducing method of silver nitrate to prepare heterogeneous silver-silica nanocomposite particles with thiol and amino groups serving to bind the Ag nanoparticles to the surfaces of the SiO2 nanoparticles. We examined products of these reductions using FTIR, SEM, XRD and UV-vis. spectroscopy. The SiO2 nanoparticles had diameters rangi...