title: Leucas aspera mediated multifunctional CeO2 nanoparticles: Structural, photoluminescent, photocatalytic and antibacterial properties.
abstract: Spherical shaped cerium dioxide (CeO2) nanoparticles (NPs) were synthesized via bio mediated route using Leucas aspera (LA) leaf extract. The NPs were characterized by PXRD, SEM, UV-Visible techniques. Photoluminescence (PL), photocatalysis and antibacterial properties of NPs were studied. PXRD patterns and Rietveld analysis confirm cubic fluorite structure with space group Fm-3m. SEM results evident that morphology of the NPs was greatly influenced by the concentration of LA leaf extract in the reaction mixture. The band gap energy of the NPs was found to be in the range of 2.98-3.4 eV. The photocatalytic activity of NPs was evaluated by decolorization of Rhodamine-B (RhB) under UVA and Sun light irradiation. CeO2 NPs show intense blue emission with CIE coordinates (0.14, 0.22) and average color coordinated temperature value ∼148,953 K. Therefore the present NPs quite useful for cool LEDs. The superior photocatalytic activity was observed for CeO2 NPs with 20 ml LA under both UVA and Sunlight irradiation. The enhanced photocatalytic activity and photoluminescent properties were attributed to defect induced band gap engineered CeO2 NPs. Further, CeO2 with 20 ml LA exhibit significant antibacterial activity against Escherichia coli (EC) and Staphylococcus aureus (SA). These findings show great promise of CeO2 NPs as multifunctional material for various applications.
authors.affiliation: Department of Physics, University College of Science, Tumkur University, Tumkur 572 103, India.
authors.forename: J
authors.initials: J
authors.lastname: Malleshappa
authors.affiliation: Prof. C.N.R. Rao Centre for Advanced Materials Research, Tumkur University, Tumkur 572 103, India. Electronic address: bhushanvlc@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.affiliation: Dayananda Sagar University, Shavige Malleshwara hills Kumara swamy layout, Bangalore 560078, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.affiliation: Department of Physics, Lal Bahadur Shastry Government First Grade College, Bangalore 560 032, India.
authors.forename: Y S
authors.initials: YS
authors.lastname: Vidya
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Anantharaju
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Prashantha
authors.affiliation: B.S. Narayan Centre of Excellence for Advanced Materials, B.M.S. Institute of Technology, Yelahanka, Bangalore 560 064, India.
authors.forename: B
authors.initials: B
authors.lastname: Daruka Prasad
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Raja Naika
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur 572 103, India.
authors.forename: K
authors.initials: K
authors.lastname: Lingaraju
authors.affiliation: Research Center, Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: B S
authors.initials: BS
authors.lastname: Surendra
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry* / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects; D004927:Escherichia coli Infections / Q000188:drug therapy; D005456:Fluorescent Dyes / Q000737:chemistry; D006801:Humans; D019686:Lamiaceae / Q000737:chemistry; D008027:Light; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010782:Photolysis; D010936:Plant Extracts / Q000737:chemistry; D012235:Rhodamines / Q000737:chemistry; D013203:Staphylococcal Infections / Q000188:drug therapy; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D005456:Fluorescent Dyes; D010936:Plant Extracts; D012235:Rhodamines; D002563:Cerium; C030583:ceric oxide; C029773:rhodamine B
keywords: Antibacterial activity; CeO(2) NPs; Leucas aspera; Photocatalysis; Photoluminescence