Polyethylene glycol assisted facile sol-gel synthesis of lanthanum oxide nanoparticles: structural characterisation and photoluminescence studies

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@article{31de21c385f04394b3b248dd247e7193,
title = "Polyethylene glycol assisted facile sol-gel synthesis of lanthanum oxide nanoparticles: structural characterisation and photoluminescence studies",
abstract = "In this study, lanthanum oxide nanoparticles (La2O3 NPs) synthesised via the facile sol-gel method, using a solution of micro-sized lanthanum oxide powders containing 20% nitric acid and high molecular weight polyethylene glycol (PEG). The as synthesised La2O3 NPs were then characterized using X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), energy-dispersive X-ray (EDS) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and photoluminescence (PL) spectroscopy. Our findings indicated that the concentration of PEG strongly influences the particle size and the lattice strain of the La2O3 NPs. A single phase hexagonal crystal structure was confirmed via XRD studies with lattice constants, a = b = 0.3973 nm and c = 0.6129 nm. The average crystallite size and lattice strains estimated were in the range of approximately 25–28 nm and 0.0050–0.0055 respectively. The incremental nature of the crystallinity and lattice strains of the NPs was observed with the subsequent enhancement of PEG-contents, while the average particle size was reduced. The average particle size of La2O3 NPs estimated from ESEM imaging was consistent with that obtained from the XRD data. The photoluminescence spectra revealed a strong emission band located at a wavelength of 365 nm (typical green band) for all La2O3NPsamples. This is ascribed to the recombination of delocalized electrons around the conduction band with a single charged state of a surface oxygen vacancy.",
keywords = "Lattice constant, Lattice strain, Particle size, Photoluminescence, Sol-gel method, X-ray diffraction",
author = "Humayun Kabir and Nandyala, {Sooraj Hussain} and Rahman, {M. Mahbubur} and Kabir, {Md Alamgir} and Zoe Pikramenou and Mark Laver and Artemis Stamboulis",
year = "2019",
month = jan,
day = "1",
doi = "10.1016/j.ceramint.2018.09.183",
language = "English",
volume = "45",
pages = "424--431",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier",
number = "1",

}

RIS

TY - JOUR

T1 - Polyethylene glycol assisted facile sol-gel synthesis of lanthanum oxide nanoparticles

T2 - structural characterisation and photoluminescence studies

AU - Kabir, Humayun

AU - Nandyala, Sooraj Hussain

AU - Rahman, M. Mahbubur

AU - Kabir, Md Alamgir

AU - Pikramenou, Zoe

AU - Laver, Mark

AU - Stamboulis, Artemis

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In this study, lanthanum oxide nanoparticles (La2O3 NPs) synthesised via the facile sol-gel method, using a solution of micro-sized lanthanum oxide powders containing 20% nitric acid and high molecular weight polyethylene glycol (PEG). The as synthesised La2O3 NPs were then characterized using X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), energy-dispersive X-ray (EDS) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and photoluminescence (PL) spectroscopy. Our findings indicated that the concentration of PEG strongly influences the particle size and the lattice strain of the La2O3 NPs. A single phase hexagonal crystal structure was confirmed via XRD studies with lattice constants, a = b = 0.3973 nm and c = 0.6129 nm. The average crystallite size and lattice strains estimated were in the range of approximately 25–28 nm and 0.0050–0.0055 respectively. The incremental nature of the crystallinity and lattice strains of the NPs was observed with the subsequent enhancement of PEG-contents, while the average particle size was reduced. The average particle size of La2O3 NPs estimated from ESEM imaging was consistent with that obtained from the XRD data. The photoluminescence spectra revealed a strong emission band located at a wavelength of 365 nm (typical green band) for all La2O3NPsamples. This is ascribed to the recombination of delocalized electrons around the conduction band with a single charged state of a surface oxygen vacancy.

AB - In this study, lanthanum oxide nanoparticles (La2O3 NPs) synthesised via the facile sol-gel method, using a solution of micro-sized lanthanum oxide powders containing 20% nitric acid and high molecular weight polyethylene glycol (PEG). The as synthesised La2O3 NPs were then characterized using X-ray diffraction (XRD), environmental scanning electron microscopy (ESEM), energy-dispersive X-ray (EDS) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and photoluminescence (PL) spectroscopy. Our findings indicated that the concentration of PEG strongly influences the particle size and the lattice strain of the La2O3 NPs. A single phase hexagonal crystal structure was confirmed via XRD studies with lattice constants, a = b = 0.3973 nm and c = 0.6129 nm. The average crystallite size and lattice strains estimated were in the range of approximately 25–28 nm and 0.0050–0.0055 respectively. The incremental nature of the crystallinity and lattice strains of the NPs was observed with the subsequent enhancement of PEG-contents, while the average particle size was reduced. The average particle size of La2O3 NPs estimated from ESEM imaging was consistent with that obtained from the XRD data. The photoluminescence spectra revealed a strong emission band located at a wavelength of 365 nm (typical green band) for all La2O3NPsamples. This is ascribed to the recombination of delocalized electrons around the conduction band with a single charged state of a surface oxygen vacancy.

KW - Lattice constant

KW - Lattice strain

KW - Particle size

KW - Photoluminescence

KW - Sol-gel method

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=85054029697&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2018.09.183

DO - 10.1016/j.ceramint.2018.09.183

M3 - Article

VL - 45

SP - 424

EP - 431

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 1

ER -