Size-Dependence of Photoluminescence Property of ZnO Nanoparticles

Abstract

Nanometer-sized ZnO crystals with the diameter from 20 nm to 110 nm were prepared by homogenous precipitation method (HPM). The photoluminescence (PL) spectra of as-prepared nanoparticles under excitation at the wavelength of 320 nm were detected. The PL spectra were fitted with Gaussian curves, in which a good fitting consisting of six Gaussian peaks was obtained. We observed that the multi-peak centers do not change much, while the relative amplitude of Gaussian combination to the band-to-band emission decreases rapidly with the increased grain size. It shows that the broadband emission at the lower energy is associated with the surface states.

Effect of Water Content in Ethylene Glycol Solvent on the Size of ZnO Nanoparticles Prepared Using Microwave Solvothermal Synthesis

“…Young's modulus of ZnO nanowires changes considerably when the shape of their cross section changes [36]. The size of ZnO particles exerts a considerable impact above all on the equilibrium constant and the thermodynamic properties of the reaction [37], photoluminescence [38], band gap [39], UV absorption [40], and toxicity [41,42]. Particularly piezoelectric parameters may be greater by several orders of magnitude in comparison with ZnO bulk material [36].…”

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

“…The properties of nanostructures depend strongly on their size and shape [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. The size-dependent effect of ZnO NPs has been observed on the: photocatalytic activity [ 337 , 338 , 339 , 340 , 341 , 342 ], catalyst activity [ 343 ], dielectric properties [ 344 ], piezoelectric property [ 345 , 346 ], breakdown voltage varistors [ 347 ], visible emission property of quantum dots displays [ 348 ], equilibrium constant of chemical reactions [ 349 ], gas sensing properties [ 350 , 351 , 352 ], thermal diffusivity of water nanofluid [ 353 ], photoluminescence [ 354 ], UV absorption [ 355 , 356 ], biomedical potential [ 357 ], toxicity [ 312 , 328 , 357 , 358 , 359 , 360 , 361 , 362 ], bioavailability [ 363 ], and interactions with biomatrices [ 364 ]. A nano ZnO material may be characterised by piezoelectric parameters of even a few times higher values than a bulk ZnO material […”