Abstract
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In this study, we transformed the magnetic characteristics of silver nanoparticles from non-magnetic to magnetic by encapsulating them within a boron nitride matrix. The boron nitride matrix separates the silver nanoparticles from one another, thereby facilitating the parallel alignment of their magnetic moments. The chemical method employed to synthesize silver nanoparticles within the boron nitride matrix (Ag-BN) was freeze-drying. X-ray diffraction (XRD) analysis revealed that the average crystallite size of the Ag-BN nanoparticles was 6.41 nm, which is comparable to the particle size determined by transmission electron microscopy (TEM), approximately 11 nm. Furthermore, the Ag-BN nanoparticles exhibited ferromagnetic characteristics at K 10,20 K. In addition, photoluminescence emission was observed at 430 nm (2.8 eV), corresponding to the visible and blue-light regions of the electromagnetic spectrum. Our investigation of Ag-BN nanoparticles revealed an unexpected magnetic response in silver nanoparticles. Ferromagnetic (FM) ordering is generally associated with transition-metal systems and is commonly attributed to the presence of partially filled d-electron shells. Therefore, the physical mechanism responsible for the observed magnetization in the Ag-BN system remains unclear. To investigate the origin of this magnetic behavior, we employ first-principles spin-polarized density functional theory (DFT) calculations to examine the electronic and magnetic properties of Ag nanoclusters. The enhanced magnetic properties of silver nanoparticles within the boron nitride matrix may provide opportunities for their application in several technologically and scientifically important fields, including magnetic data storage, medical imaging, targeted drug delivery, cancer treatment, and water purification.
Keywords: Silver; Boron Nitride; Freeze-Drying; Magnetic Properties; Nanoparticles.
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