Low-temperature synthesis and characterization of ZnO quantum dots

Yang, Lili; Yang, Jing; Liu, Xiaoyan; Zhang, Yongjun; Wang, Yaxin; Fan, Hougang; Wang, Dandan; Lang, Jihui

doi:10.1016/j.jallcom.2007.12.006

Cited by 37 publications

(17 citation statements)

References 29 publications

(38 reference statements)

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“…Several methods have been reported in the literature for synthesis of ZnO nanoparticles, categorized into either chemical or physical methods, such as nanolithography, physical vapour deposition (PVD), chemical vapour deposition, spray conversion processing, sol-gel process, and precipitation method [10][11][12][13][14][15][16][17]. Among the various methods, precipitation is one of the most important methods to prepare the nanoparticles; the method reduces the temperature of the reaction where homogenous mixtures of the reagents precipitate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterizations of Zinc Oxide Nanoparticles for Antibacterial Applications

Getie¹,

Belay²,

Ar³

et al. 2017

J Nanomed Nanotechnol

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In this study various shapes and sizes of the wurtzite structure of ZnO nanoparticles were synthesised via a wet chemical method for antibacterial applications. The synthesised ZnO NPs were also modified using biologically active compound, caffeine. The ZnO nanoparticles were investigated by XRD, SEM, FTIR, UV-Vis and Fluorescence spectroscopy. The average crystallite size of the ZnO NPs using XRD was within the ranges of 28.09-31.86 nm. The shape of ZnO NPs synthesised from Zn (NO 3 ) 2 .6H 2 O, ZnCl 2 and Zn (CH 3 COO) 2 .2H 2 O grain, spherical and rod-like respectively. The variations in size and shape of ZnO NPs are due to the difference in precursors and calcinations temperature. The absorption peak of the ZnO NPs was observed at 278 nm, 374 nm and 378 nm for ZnCl 2 , Zn (NO 3 ) 2 .6H 2 O and Zn (CH 3 COO) 2 .2H 2 O respectively. The FTIR peaks due to vibrational phonons of ZnO NPs also confirm the successful production of ZnO nanoparticles. The emission spectra of ZnO NPs were observed in ultraviolet due to the electronic transition from conduction band edge to valence band, and visible emission band due to defects that are related to deep level emissions. The synthesised ZnO NPs were applied for antibacterial activity against S. aureus and E. coli bacteria using agar disc diffusion method. All the three ZnO Nps performed better antibacterial activity than the standard antibiotics and also S. aureus was shown to be more sensitive to ZnO NPs than E. coli.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterizations of Zinc Oxide Nanoparticles for Antibacterial Applications

Getie¹,

Belay²,

Ar³

et al. 2017

J Nanomed Nanotechnol

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show abstract

“…They develop emission when excited with a UV light. The wavelength of emission depends on the size of the nanoparticles [1,2]. Their semiconducting properties originate from their excitons confined in all three spatial dimensions [3].…”

Section: Introductionmentioning

confidence: 99%

“…There are several methods of preparation of QDs, among them colloidal synthesis [2,[46][47][48][49] seems to be cheapest and least hazardous. In such processes precursors of quantum dots blended under controlled concentration with an organic surfactant and a solvent are heated to split into monomeric molecules then allowed to crystallize under specially adjusted regimes.…”

Section: Introductionmentioning

confidence: 99%

CdS and ZnS quantum dots embedded in hyaluronic acid films

Khachatryan

Stobiński

et al. 2009

Journal of Alloys and Compounds

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“…The ultraviolet (UV) emission peak is enhanced and green emission is weakened due to radial structures and the modification of S-PS on the surface of ZnO hexagonal nanoprisms. The UV emission, originated from the exciton combination of ZnO, can be attributed to UV near-band edge emission [14]. For the asprepared product, the yellow-green part of the visible spectrum has been almost quenched due that the radial structures and the modification of S-PS result in the decrease of the density of oxygen vacancy sites on ZnO facets.…”

Section: Resultsmentioning

confidence: 99%