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 Gd_2-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 Gd_2-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