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  1. Kee LH, Ying Chyi JL, Zainal Abidin Talib, Mohammad Shuhazlly Mamat, Hong Ngee JL, Fakhrurrazi Ashari, et al.
    Sains Malaysiana, 2016;45:1201-1206.
    Zinc selenide/graphene oxide (ZnSe/GO) composite is synthesized using hydrothermal method. Two different methods
    such as direct and indirect route have been investigated to form the ZnSe/GO composite. In this research, the graphene
    oxide used was in sheet and liquid form. The synthesized composite was then characterized using X-ray diffraction (XRD)
    for phase identification, field emission scanning electron microscopy (FESEM) for morphology analysis and ultravioletvisible
    spectroscopy (UV-Vis) for optical properties. ZnSe/GO composite showed absorption peak ranging from 460 to
    480 nm with the optical band gap obtained through Tauc equation. The optical band gap of the ZnSe/GO composite has
    been tuned down to a smaller value as compared to the bulk ZnSe compound. The optical band gap has been reduced
    to around 2.53 eV when liquid graphene oxide was used while around 2.23 to 2.32 eV when graphene oxide sheet was
    used. The purity of ZnSe/GO composite synthesis via indirect hydrothermal method is higher than those synthesized via
    direct hydrothermal method. The type of graphene oxide will affect the morphology of the composite where the ZnSe
    compound was either wrapped by tiny thorn-like substance or graphene oxide layer.
  2. Fakhrurrazi Ashari, Ying Chyi JL, Zainal Abidin Talib, W. Wahmood Wan Yunus, Jian LY, Kee LH, et al.
    Sains Malaysiana, 2016;45:1191-1196.
    Zinc selenide (ZnSe) quantum dots (QDs) have been synthesized through a hydrothermal method using ZnCl2
    and Na2
    SeO3
    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).
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