Communications in Physics

Composites of conducting polymers and nanoparticles for thin-film-multilayers OLEDs, OSCs and gas sensors

Nguyen Nang Dinh — Sat, 01 Mar 2025 00:00:00 +0700

In this work is a general view on nanostructured polymeric composite materials used for preparation and characterization of a group of organic optoelectronic devices, such as Organic Light-Emitting Diodes (OLEDs), Solar Cells (OSCs) and Gas Sensors (OGSs). From recent references, this work gives informations on structural, morphological, electrical and optical properties as well as perfomance behaviour of the nanocomposite devies. The analyzed data have demonstrated that nanostructured composite materials consisting of conducting polymers (CP) and nanoparticles have significantly contributed to enhance both the performance parameters and working time of devices. The presence of inorganic nanoparticles in polymers has strongly influenced all physical properties of the polymers. In this work we concentrated to analyze the most interesting properties of the OLEDs, OSCs and OGSs, such as electro-luminescence, photo-electrical conversion, and gas sensing. This review work also shows in general, the discovery source of the CPs, some typical CPs and their composites used for the fabrication of nanocomposite devices which aim at different practical purposes.

Dispersion management in organic liquid-cladding photonic crystal fiber based on GeSe2–As2Se3–PbSe chalcogenide

Van Hieu Le — Tue, 01 Apr 2025 00:00:00 +0700

We present a numerical study of the influence of the liquids on fiber properties. The PCF was proposed based on the GeSe₂–As₂Se₃–PbSe chalcogenide, infiltrated with six organic liquids in air holes in the cladding. The guiding properties in terms of dispersion characteristics, mode area, nonlinear coefficient, and confinement loss of the fundamental mode were numerically investigated. The result is that it is possible to shift the wavelength of the zero dispersion by about 20 nm to longer wavelengths and to reduce the slope of the dispersion curve of the fiber by the liquid filling. The results obtained also show that the PCF has a larger mode area (lower nonlinear coefficient) when infiltrated with liquids with a higher refractive index. At the same time, the presence of liquid in the cladding is responsible for the increase in confinement loss. In particular, the fiber has a lower confinement loss when infiltrated with liquids with a higher refractive index.

Impact of CHF Correlations on DNBR of the TRIGA Mark II Research Reactor under different operational modes and burn-up conditions

Md Altaf Hossen — Fri, 07 Mar 2025 00:00:00 +0700

Departure from Nucleate Boiling Ratio (DNBR) is a crucial thermal hydraulics safety parameter for nuclear reactors. Hence selecting appropriate DNBR correlation is vital for design, licence and operation. The Bernath, Misrak, and Tong correlations have been utilized in PARET/ANL code in this study to calculate DNBR in TRIGA Mark II research reactor during both steady state and transient conditions, spanning from the beginning of cycle (BOC) to 1000 MWD of operation life. The findings reveal that the Bernath correlation consistently yields the lowest values across all operational phases compared to the Misrak and Tong correlations. Remarkably, the results obtained from the Bernath correlation align with the recommendations put forth by the General Atomics (GA) and Safety Analysis Report. Consequently, it is deemed suitable for application throughout all modes of reactor operation.