Sains Malaysiana 47(8)(2018): 1861–1866

http://dx.doi.org/10.17576/jsm-2018-4708-26

 

Synthesis and Characterization of Gd2O2S: Pr3+ Nanophosphors using Gamma Irradiation Method

(Sintesis dan Pencirian Nanofosfor Gd2O2S: Pr3+ menggunakan Kaedah Gama Iradiasi)

 

MUHAMMAD HASSYAKIRIN HASIM, IRMAN ABDUL RAHMAN*, SAPIZAH RAHIM, MUHAMMAD TAQIYUDDIN MAWARDI AYOB, LIYANA MOHD ALI NAPIA & SHAHIDAN RADIMAN

 

Nuclear Technology Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 24 April 2013/Diterima: 9 November 2017

 

ABSTRACT

 

Praseodymium ion, Pr3+ doped Gd2O2S nanophosphors were successfully synthesized via gamma irradiation route along with the heat treatment. The effect of the gamma irradiation (0-150 kGy) on the structural, morphology and photoluminescence properties of Gd2O2S:Pr3+ were characterized via X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and photoluminescence spectroscopy (PL). The thermal properties of precursor sample were tested by the thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The chemical bonding of the precursor samples were analyzed by Fourier transform infrared spectroscopy (FT-IR). The XRD result confirmed the formation of hexagonal phase of Gd2O2S:Pr3+ without the presence of any impurities. The FESEM inspection showed the non-symmetrical shape of particles transformed into grain-like shape. The optimum photoluminescence (PL) emission intensities of Gd2-xO2S:xPr3+ occur at 50 kGy dose of gamma irradiation and 2 mol% concentration dopant of Pr3+ ions. The spectra under 325 nm UV excitation shows a strong green emission at 515 nm, which match the 3P0 3H4 transition of Pr3+ ions. The Gd2O2S:Pr3+ nanophosphors possessed many useful approaches in various applications mainly as radiation detection and biomedical diagnostic.

 

Keywords: Gadolinium oxysulfide; gamma irradiation; praseodymium doped

 

ABSTRAK

Nanofosfor Gd2O2S didop ion praseodimium, Pr3+ berjaya disintesis melalui kaedah penyinaran gama bersama dengan rawatan haba. Kesan penyinaran gama (0-150 kGy) terhadap sifat struktur, morfologi dan kefotopendarcahayaan Gd2O2S:Pr3+ dicirikan melalui alat pembelauan sinar-X (XRD), mikroskop imbasan pancaran medan elektron (FESEM) dan spektroskopi kefotopendarcahayaan (PL). Sifat terma sampel pelopor diuji oleh analisis termogravimetrik (TGA) dan analisis pembezaan terma (DTA). Ikatan kimia sampel pelopor dianalisis oleh spektroskopi inframerah transformasi Fourier (FT-IR). Keputusan XRD mengesahkan pembentukan fasa heksagon Gd2O2S:Pr3+ tanpa kehadiran sebarang bendasing. Pemeriksaan FESEM mendedahkan bentuk zarah tak simetri berubah menjadi bentuk seakan bijian. Keamatan pemancaran kefotopendarcahayaan (PL) yang optimum Gd2-xO2S:xPr3+ adalah pada dos terserap 50 kGy dan 2 mol% kepekatan dop ion Pr3+. Spektrum bawah pengujaan UV 325 nm menunjukkan pancaran hijau yang kuat pada 515 nm sepadan dengan peralihan 3P0 3H4 oleh ion Pr3+. Nanofosfor Gd2O2S:Pr3+ memiliki banyak pendekatan yang berguna dalam pelbagai aplikasi terutamanya sebagai pengesanan sinaran dan diagnostik bioperubatan.

 

Kata kunci: Dop praseodimium; Gadolinium oksisulfid; penyinaran gama

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*Pengarang untuk surat-menyurat; email: irman@ukm.edu.my

 

 

 

 

 

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