http://nopr.niscpr.res.in/handle/123456789/62428 <b>Special Issue: "Solid State Nuclear Track Detectors and their Applications"</b> 2026-10-11T07:02:00Z http://nopr.niscpr.res.in/handle/123456789/62449 Title: Tailoring the Properties of Nanocrystalline Tin(II) Selenide Films through Precursor Concentration Modulation Authors: Shikha, Deep; Mehta, Vimal; Kumar, Mahesh; Chauhan, R P Abstract: An X-ray diffractometer for structural, a UV-VIS Spectrophotometer for optical, and a unique aluminium sample holder intended to examine the electrical properties of the synthesized SnSe thin films on non-conductive glass substrates in an alkaline medium were used. Light shining through a transparent glass window illuminated the samples to examine their electrical (photoconductivity) properties. The XRD results show that all of the films are orthorhombic crystals. The concentration of the precursor affects microstructural characteristics such as micro strain, crystallite size, and dislocation density. SnSe thin films' optical bandgap is measured using absorbance measurements. Semiconducting properties are confirmed by measuring the electrical conductivity, which reaches its highest value at the optimal precursor concentration. The as-grown SnSe films exhibit tunable photo response properties, which boost the practical application of the films in photovoltaic and solar cells. Page(s): 365-368 2023-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62448 Title: Design and Optimization of MEMS based AlN sensor for Acoustic Application Authors: Sawane, Mohini; Prasad, Mahanth; Kumar, Rajesh Abstract: The market for MEMS sensors based on Aluminum Nitride (AlN) is developing because of AlN material's capacity to produce CMOS-compatible, highly reliable, and self-powered devices. Utilizing the COMSOL software tool, the sensors parameters are designed and optimized in accordance with the dimension and thickness of AlN thin film layer. The proposed design technique is applicable to any piezoelectric diaphragm-based acoustic sensors, regardless of the cavity and hole structures in the silicon or SOI (silicon on insulator) based substrate. The diaphragm consists fixed 25 μm Si layer and variable (0.5 μm to 2.5 μm) Al/AlN/Al layer. The AlN layer is sandwiched between top and bottom Aluminum electrodes of thickness 0.3 μm. The diaphragm area is varying from 1.75 mm x 1.75 mm to 3.5 mm x 3.5 mm. Prior to engaging in expensive fabrication methods, this work optimizes the AlN layer with regard to resonance frequency, deflection at the diaphragm's center, and sensor response. The simulated results demonstrate the trade-off between the diaphragm deflection at the center and a workable frequency range in accordance with the design parameters that were specified. For a frequency range of 0.5 kHz to 18 kHz, the device's optimal design has a simulated sensitivity of 2.5 μV/Pa and at resonance the sensitivity is 200 μV/Pa. Page(s): 369-375 2023-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62447 Title: OSL Characteristics of Cu Activated NaLi2PO4 Phosphor Authors: Bai, Bhuli; Sahare, P D Abstract: Cu-activated NaLi2PO4 phosphor material was successfully synthesized through solid state diffusion method. It was mainly doped with Cu2Cl2 and CuCl2 salts for impurities in the form of Cu+ and Cu2+ respectively. Powder X-ray Diffraction (PXRD) was carried out for the confirmation of single phase of synthesized phosphor material. Dosimetric properties of the material were investigated using the Optically Stimulated (OSL) techniques. We have found maximum sensitivity of Cu2+: NaLi2PO4 samples at concentration 1000ppm (0.1 mol%) in OSL with annealing temperatures 1073K. Whereas for Cu+: NaLi2PO4 samples, 873K was considered as the optimization annealing temperature with impurity concentrations 0.08mol%. The phosphor material exhibits good dosimetric characteristics. It was found that NaLi2PO4:Cu2+ is little less (3 times) and NaLi2PO4: Cu+ is 4.2 times less sensitive than that of STD. Al2O3:C (Landauer Inc., USA) respectively. For further OSL studies only NaLi2PO4:Cu2+ used. Low TL fading, for NaLi2PO4:Cu2+, only 10.74% fading takes place in 10days after that it negligibly fade. Also, wide OSL dose response (10-15kGy), easy optically bleaching for reusability and easy to handle are some of the other significant qualities observed in our samples. Simple method of preparation and tissue equivalence (Zeff~10.8) adds on the advantages of NaLi2PO4: Cu phosphor. This type of phosphor is also suitable for high energy radiation dosimetry used in OSL techniques. Page(s): 376-382 2023-08-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/62446 Title: Synthesis of MoS2@TiO2 Nanosheets by Liquid Exfoliation Method for Wastewater Treatment Authors: Shweta; Singh, Pooja; Singh, Vinamrita; Kumar, Kaushal; Lal, Sohan; Kumar, Arun Abstract: Molybdenum Disulphide (MoS2) based materials in pure form or composites are known for their photocatalytic activity including wastewater treatment and purification. In the present study, pristine MoS2nanosheets and MoS2@TiO2 composite nanosheets are synthesized via grinding-assisted sonication process with N-Methylpyrrolidone (NMP) as solvent. TiO2 being environment friendly with high photochemical stability, provides a suitable reinforcement material for photocatalytic applications. The prepared dispersions are characterized by UV-Vis, Raman and FTIR spectroscopy for structural and optical properties. These nanosheets are tested for methylene blue dye degradation in dark and in the presence of sunlight at intervals of 30 minutes. The MoS2@TiO2nanosheets show enhanced degradation efficiency in comparison to the pristine MoS2nanosheets. These composite nanosheets are potential materials in tackling dye pollutants for application in wastewater treatment plants and purification. Page(s): 383-389 2023-08-01T00:00:00Z