Kumar, Jitender Kumar, Rajesh Singh, Mukhtiyar Kumar, Shalendra Kumar, Ravi Won, Sung Ok Brajpuriya, Ranjeet Dwivedi, Sourabh Sharma, Ram K. Vij, Ankush 2024-01-19T14:02:41Z 2024-01-19T14:02:41Z 2022-01-25 2021-08 0947-8396 https://pubs.kist.re.kr/handle/201004/116612 We report here the structural, reflectance, photoluminescence and thermoluminescence study of t-Mg2B2O5 nanostructures synthesized using optimized combustion method relatively at much lower temperature. The rietveld refinement of X-ray diffraction data confirms single-phase triclinic crystal structure of Mg2B2O5 nanoparticles. The direct band gap determined using diffuse reflectance spectra (DRS) was 5.23 eV, which is contrary to earlier reports quoting Mg2B2O5 as indirect band gap material. To elucidate the nature of band gap in Mg2B2O5, we performed first principle calculations based on full potential linearized augmented plane-wave (FPLAPW) method, predicting the direct band gap of 5.10 eV in t-Mg2B2O5 which is in good agreement with our experimental results. The t-Mg2B2O5 nanoparticles were found to exhibit yellow-reddish photoluminescence peaking at 588 nm, attributed to various defects states. The combustion synthesized Mg2B2O5 nanocrystals exhibited ultraviolet (254 nm) responsive thermoluminescence (TL). TL glow curve of Mg2B2O5 comprises of one dominant peak around 417-428 K and less intense shoulder around 573-589 K which arouse possibility of various trapping sites or defects present in the sample. The TL analysis using general order Kitti's equations was performed to estimate the activation energies of trapping states. Owing to already well-known mechanical and thermal properties, the direct wide band gap nature and UV responsive thermoluminescence of combustion synthesized t-Mg2B2O5 nanostructures can pave way for its use in luminescence-based applications and UV dosimetry. As an additional application of Mg2B2O5, anti-biofilms activity of Mg2B2O5 nanoparticles using pseudomonas aeruginosa bacterial cells was also performed which revealed 91 +/- 2.7% inhibition of biofilms formed by P. aeruginosa, respectively, at 100 mu g/ml after 24 h of treatment. English SPRINGER HEIDELBERG Structural, diffuse reflectance and luminescence study of t-Mg2B2O5 nanostructures Article 10.1007/s00339-021-04761-w 1 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.127, no.8 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 127 8 N scie scopus 000691442900001 2-s2.0-85111336931 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article SOLID-SOLUTIONS MAGNESIUM PHOTOLUMINESCENCE t-Mg2B2O5 Nanostructures Photoluminescence Diffuse reflectance Thermoluminescence UV dosimetry