Sains Malaysiana 45(8)(2016): 1191–1196

Optical Characterization of Colloidal Zinc Selenide Quantum Dots Prepared through Hydrothermal Method

(Pencirian Optik Titik Kuantum Koloid Zink Selenida Disediakan melalui Kaedah Hidroterma)

FAKHRURRAZI ASHAR1^I, JOSEPHINE LIEW YING CHYI¹*, ZAINAL ABIDIN TALIB¹,

 W. WAHMOOD WAN YUNUS¹, LEONG YONG JIAN¹, LEE HAN KEE¹, CHANG FU DEE²

& BURHANUDDIN YEO MAJLIS²

¹Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia

²Institute Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia

Received: 20 April 2015/Accepted: 12 August 2015

ABSTRACT

Zinc selenide (ZnSe) quantum dots (QDs) have been synthesized through a hydrothermal method using ZnCl₂ and Na₂SeO₃ powder as the precursor in the presence of oleylamine as capping agent. The hydrothermal route was conducted at a moderate temperature (150°C) for 8 h. Optical properties of ZnSe QDs were studied through ultraviolet-visible spectroscopy (UV-Vis) and photoluminescence (PL) while the structural properties of ZnSe QDs were characterized using transmission electron microscope (TEM). The photoluminescence (PL) characterization on ZnSe QDs showed that the QDs emit light in blue range region at around 440 nm with optical band gap energy at 3.68 eV. The TEM results showed that the average particle size is around 8.9 nm. It is a good candidates for optoelectronic devices such as light emitting diodes (LED).

Keywords: Absorption; morphology; optical band gap; photoluminesnce

ABSTRAK

Titik kuantum(QDs) zink selenida (ZnSe) telah disintesis melalui kaedah hidroterma menggunakan serbuk ZnCl₂ dan Na₂SeO₃ sebagai sumber asal dengan kehadiran oleilamina sebagai agen penutup. Kaedah hidroterma telah dijalankan pada suhu sederhana (150°C) selama 8 jam. Sifat optik ZnSe QDs telah dikaji melalui spektroskopi ultraungu/boleh nampak (UV-Vis) dan spektroskopi fotoluminesen (PL) manakala sifat struktur ZnSe QDs dicirikan menggunakan mikroskop trasmisi elektron (TEM). Pencirian fotoluminesen (PL) pada QDs menunjukkan bahawa QDs memancarkan cahaya di rantau julat biru sekitar 440 nm dengan jurang jalur optik pada 3.68 eV. Keputusan TEM ini menunjukkan bahawa purata saiz zarah adalah sekitar 8.9 nm. Ia adalah satu calon yang baik untuk peranti optoelektronik seperti diod pemancar cahaya (LED).

Kata kunci: Fotoluminesen; jurang jalur optik; penyerapan; morfologi

REFERENCES

Gupta, P. & Ramrakhiani, M. 2009. Influence of the particle size on the optical properties of CdSe nanoparticles. Open Nanoscience Journal 3: 15-19.

Jiao, Y., Yu, D., Wang, Z., Tang, K. & Sun, X. 2007. Synthesis, nonlinear optical properties and photoluminescence of ZnSe quantum dots in stable solutions. Materials Letters 61(7): 1541-1543.

Liu, C., Ji, Y. & Tan, T. 2013. One-pot hydrothermal synthesis of water-dispersible ZnS quantum dots modified with mercaptoacetic acid. Journal of Alloys and Compounds 570: 23-27.

Murase, N. & Gao, M. 2004. Preparation and photoluminescence of water-dispersible ZnSe nanocrystals. Materials Letters 58(30): 3898-3902.

*Corresponding author; email: josephine@upm.edu.my