Research Publications

Academic theses and dissertations are regularly published and widely disseminated in YUOE Journal, Monographs, Universities Research Journal (URJ), Myanmar Academy of Arts and Science (MAAS) Journal, AsTEN Research Journal and International online Journals for sharing knowledge and contributing to the development of our education.

Myanmar Academy of Art & Science List of Research

No. Researcher Title Abstract Year
91 Win Win Mon STRUCTURAL, THERMAL AND ELECTRICAL CHARACTERISTICS OF NICKEL POTASSIUM SULPHATE HEXAHYDRATE (NPSH) CRYSTAL Single crystals of Nickel Potassium Sulphate Hexahydrate, NiK2(SO4)2.6H2O (NPSH) were grown by slow evaporation of saturated solution containing equimolar ratio of Nickel Sulphate Hexahydrate, NiSO4.6H2O, and Potassium Sulphate, K2SO4, salt powders. Structural analysis of the green colour crystal was investigated by XRD method. The crystal was characterized by simultaneous Thermogravimetric and Differential Thermal Analysis (TG-DTA) method to study the high temperature phases of dehydration and meeting of the crystal. Electrical conductivity with temperature of the crystal was investigated in the temperature range of 299 K – 653 K. Dehydration temperature (Tdehydration) of the crystal was determined from the (ln ? vs 1000/T) relationship. The activation energies of the crystal in the TTdehydration and TTdehydration regions were evaluated in this work. 2018
92 Saw Shine Ko INVESTIGATION OF nOITO THIN FILMS ON STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES The investigations of structural, optical and electrical properties of nO/ITO thin films have been presented. The nO nanocrystalline thin films were prepared by Chemical Bath Deposition method. inc chloride and sodium hydroxide (NaOH) were used as precursor materials. Thin films of nO were deposited onto ITO (indium tin oxide) substrate post annealed temperature at 300?C, 400?C in the muffle furnance. X-ray diffraction (XRD) of the nO films showed hexagonal structure. Debye Scherrer equation was used to calculate crystallite size. Scanning electron microscopy (SEM) study provides better topographic feature of the sample surface. The optical band gap was analyzed by absorption spectra of nO.1/C2 – V properties of nO thin films were determined from C-V measurement. The photovoltaic properties of these films were investigated by current density-voltage characteristic. The photoconversion efficiency was influenced by the open-circuit voltage. 2018
93 Win Pa Pa Khaing GROWTH AND CHARACTERIATION OF nTiO3 PEROVSKITE FILM ON SI SUSTRATE inc titanate (nTiO3; T) powders were successfully prepared by a solid state reaction method. T powder were heated at various calcination temperatures ranging from 500 C to 850 C for 2h. Powder samples were characterized using thermo gravimetric (TGA), differential thermal analysis (DTA), X-ray diffractrometer (XRD), scanning electron microscopy (SEM). The second phases such as nO and TiO2 were detected in the powders calcined below 850 C. A single perovskite of the T powders was found with calcination temperatures at 850 C. The TGA-DTA results corresponded to the XRD investigation. The crystalline powders were mixed with the solvent and deposited onto the silicon substrates by using spin coating method. Annealing of the deposited films were performed at temperatures ranging from 400oC to 800oC for 1h. The X-ray diffraction, scanning electron microscope and UV-vis spectroscopy have been employed to characterize the deposited films. The obtained 2D materials surface were nTiO3 with cubic structure. The absorbance spectra exhibited visible light emission and optical band gap was 3.7 eV. 2018
94 Hnin Thu Zar STUDY ON DIELECTRIC PROPERTIES AND CHARGE CONDUCTION MECHANISM OF INC SULPHIDE FILMS Y CHEMICAL ATH DEPOSITION METHOD nS films were prepared by chemical bath deposition (CBD) technique at 80C for 4h. The composite film was characterized by using LCR meter. Comparative study on dielectric and charge conduction properties of nS films (1:1), (2:1) and (3:1) were investigated. Dielectric properties of films significantly obtained and indicated the photovoltaic behavior of fabricated films. Dielectric constant (r,),loss tangent (tan) and capacitance (C) were measured different at frequency modes. The charge conduction mechanism was identified by 1/C2-V characteristics. The dopant concentration for p-type conductivity (Na), the depletion layer width (W) and barrier height () were determined from 1/C2-V characteristic. 2018
95 Moe Saw FARICATION MECHANISM AND OPTICAL PROPERTIES OF PURE nO AND nS-nO NANOCOMPOSITE FILMS The film of pure nO and nS – nO nanocomposite films have been prepared by chemical deposition method by varying the concentration ratio of pure nO and nS – nO nanocomposite powder. The preparation of these films grown on glass substrates were reported in this work. The optical properties of the samples were characterized by UV- Vis spectroscopy within wavelength range of 190 nm and 1100 nm. nS – nO nanocomposite (90 % - 10%) exhibited the maximum degree of optical band gap (3.295 eV) why the lowest band gap (2.749 eV) was obtained by nS – nO nanocomposite film (50% - 50 % ). 2018
96 Su Su Lwin SYNTHESIS, STRUCTURAL AND OPTICAL PROPERTIES OF nO-TiO2-GO NANOCOMPOSITE Graphene oxide (GO) nanoparticles were synthesized by Hmmmers method and the synthesized graphene oxide was analyzed by X-ray diffraction (XRD), energy dispersive X-ray (EDX), fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy and field emission scanning electron microscopy (FESEM). The XRD pattern reveled a (001) diffraction peak, signifying the successful synthesis of GO. The elemental composition of GO was characterized by EDX analysis. The mass ratio of C/O is 2.26. The results of FT-IR showed that C-O bond, O-H group with water molecules and C=C bond with graphene oxide. UV-Vis spectra of GO exhibited maximum absorption peak at 290 nm. And then, nOTiO2nanocomposite was prepared by simple mechanochemical activation method and the nO-TiO2-GOnanocomposite was prepared by simple mechanical stirring followed by ultra-sonication. X-ray diffraction (XRD) technique was employed to examine the crystal structure and phase analysis of nO-TiO2 and nO-TiO2-GO nanocomposite. The elemental composition of nO-TiO2 and nO-TiO2-GOnanocomposite were characterized by EDX analysis. The optical properties of nO-TiO2 and nO-TiO2-GO nanocomposite were identified by ultraviolet-visible spectroscopy. UV-Vis spectra of nO-TiO2 nanocomposite exhibited maximum absorption peak at 289 nm and 372 nm. For nO-TiO2-GO nanocomposite, the maximum absorption peak are 543 nm and 645 nm. The particles sizes and the surface structure were examined by atomic force microscope (AFM) analysis and field emission scanning electron microscope (FESEM) analysis. 2018
97 Zar Zar Myint Aung STUDIES ON EFFECT OF YTTERIUM SUSTITUTION IN INC FERRITE Rare earth, ytterbium doped inc ferrites (n(YbxFe1-x)2O4 ) with x=0.0000, 0.0125, 0.0250, 0.0375 and 0.0500 have been prepared by the solid state method. The raw materials such as ytterbium oxide, zinc oxide and ferrite oxide have been used as the source materials. The spinel ferrite structure, cubic morphology, and the identification of functional groups of the ytterbium doped zinc ferrite have been analyzed systematically using several analytical tools. The resistivity decreases in the sample without RE dopants for both frequency regions of(10 kHz-100 kHz)and(1MHz10MHz). Moreover, rare-earth doped samples exhibit high conductivity than undoped zinc ferrite. The electrical conductivity at room temperature is directly proportional to the reaction rate of samples. 2018
98 Ei Cherry Hlaing LASER RAMAN, FTIR SPECTROSCOPIC INVESTIGATION AND INFRARED LIGHT TESTING OF M2SO4 (M K, NH4, Li) DOPED TRIGLYCINE SULPHATE(TGS) CRYSTALS In this paper, crystals of undoped Triglycine Sulphate, (NH2CH2COOH)3.H2SO4, (abbreviated as TGS) and M2SO4 (where M = K, NH4, Li) doped TGS have been grown by solution growth method. The grown crystals were characterized by laser Raman and FTIR spectroscopy to study the vibrational characteristics of the various functional groups present in the crystals. Laser Raman spectra were observed by Ocean Optics E65000 Visolator Raman Spectrophotometer. FTIR spectra were observed by using Perkin-Elmer Spectrum-100 FTIR Spectrophotometer. Vibrational characteristics and mode assignments of constituent molecules of SO42-, COO-, CC, CO2CH2CH2, NHNH3, NH3 and CO2 were reported. Furthermore, infrared (IR) light transmission experiments were tested by using laboratory-prepared IR driving circuit to show the IR windows materials. 2018
99 July Oo STUDY ON HUMIDITY SENSITIVE ELECTRICAL PROPERTIES OF ARIUM FERRITE Barium ferrites, BaFe2O4, were prepared by solid state reaction method. The X-ray diffraction (XRD) method was used for qualitative phase analysis of the samples and to estimate the crystallite sizes of the samples. Scanning Electron Microscope (SEM) was used to examine the morphological features of the samples. The powders were made into circular shape pellets and their humidity sensitive electrical properties of the samples were studied in the relative humidity range of 50 RH% – 98 RH%. The sensitivities of the samples were compared with each other for humidity sensor application. 2018
100 Shwe Yee Win DYE-SENSITIED SOLAR CELL ASED ON TiO2-MgO COMPOSITE ELECTRODES Y USING COMINED DYE This research focused on improving the methodology of producing dye-sensitized solar cell (DSSCs) by the process of amalgamation with natural dyes. In this research, the ?s???s?? dye as chlorophyll and ?? yellow dye as anthocyanian have been prepared and mixed these dyes. The combination of natural dyes by the ratio (1:1) used in the DSSCs as sensitizer. Next the titanium dioxide (TiO2) and magnesium oxide (MgO) composite materials were mechanochemically prepared. And TiO2 and MgO were mixed in different ratios as TiO2 (pure), TiO2 (95%)MgO(5%) and TiO2(90%)-MgO(10%). Then, the TiO2 – MgO powder were prepared to be paste and they were deposited onto ITO/glass substrate by rolling method and immersed in the mixed dye solution to get dye cells. The dyed TiO2-MgO-ITO/glass cells were offset with ITO/glass cell coated with adhesive carbon paste. The photovoltaic properties of prepared TiO2-MgO DSSCs were investigated by J-V measurements. The results showed that the efficiency and fill factor (FF) were acceptable for industrial requirement and they are inexpensive candidates for DSSCs fabrication. 2018