Browsing by Subject Raman

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 3 to 9 of 9
  • Effect of Annealing Temperature on Cu2O Thin Films Prepared by Thermal Oxidation Method.pdf.jpg
  • Article


  • Authors: Tran, Thi Ha; Nguyen, Thi Huyen Trang; Bach, Thanh Cong; Nguyen, Thi Dieu Thu; Nguyen, Thanh Binh; Nguyen, Viet Tuyen; Pham, Nguyen Hai (2020)

  • We report a facile process to fabricate cuprous thin films by thermal oxidation of copper substrates. Structure and phase identification were studied by X-ray diffraction measurement and Raman spectroscopy. Scanning electron microscopy was utilized to study surface morphology of the as-fabricated thin films and optical properties of the samples were investigated by diffused reflectance spectroscopy. The study shows that cuprous thin films could be obtained by controlling annealing temperature in the region of 200-300 oC.

  • 54.pdf.jpg
  • Article


  • Authors: Dao, Viet Thang; Du, Thi Xuan Thao; Le, Thi Mai Oanh; Nguyen, Van Minh (2015)

  • Structural, optical and magnetic properties of BiFeO3 and Bi0.9Nd0.1Fe0.95TM0.05O3 (TM = Ni, Co) polycrystallines prepared by sol–gel method have been investigated. X-ray diffraction (XRD) patterns reveal that all samples crystalize in rhombohedrally distorted perovskite structure belonging to R3C space group. The analysis results of both XRD and Raman scattering show the increase of lattice distortion with the co-replacing of Nd and TM ions into A and B sites respectively. All samples exhibit a weak ferromagnetic behavior at room temperature with the enhancement of the magnetization in Nd and TM co-doped samples.

  • 8.pdf.jpg
  • Article


  • Authors: Dao, Viet Thang; Du, Thi Xuan Thao; Le, Thi Mai Oanh; Nguyen, Van Minh (2015)

  • Structural, optical and magnetic properties of BiFeO3 and Bi0.9Nd0.1Fe0.95TM0.05O3 (TM = Ni, Co) polycrystallines prepared by sol–gel method have been investigated. X-ray diffraction (XRD) patterns reveal that all samples crystalize in rhombohedrally distorted perovskite structure belonging to R3C space group. The analysis results of both XRD and Raman scattering show the increase of lattice distortion with the co-replacing of Nd and TM ions into A and B sites respectively. All samples exhibit a weak ferromagnetic behavior at room temperature with the enhancement of the magnetization in Nd and TM co-doped samples.

  • 4280-97-8419-1-10-20180924.pdf.jpg
  • Article


  • Authors: Pham, Thi Hong; Nguyen, Viet Tuyen; Tran, Thi Ha (2018)

  • Cu2ZnSnS4 (CZTS) is a p-type semiconductor with high absorption coefficient and direct bandgap from 1 to 1.5 eV, which is ideal for making absorber layer for solar cell. However, it is difficult to get single phase of CZTS due to the competitive formation of binary and ternary secondary phases. In this paper, we prepared CZTS nanoparticles by hydrothermal method and investigate the influence of hydrothermal temperature on the product. Raman scattering, X-ray diffraction, scanning electron microcopy, energy dispersive X-ray spectroscopy and diffusion reflective measurement were applied to characterize the products. The products are high quality nanocrystals of kesterite phase with unif...

  • TC_02644.pdf.jpg
  • Article


  • Authors: Le, Thi Thu Huong; Häger, Tobias (2010)

  • Natural and synthetic beryl, Al2 Be3Si 6O18, from various deposits and manufacturers were investigated with Raman, I R spectroscopy, Laser Ablat ion I nductivel y Coupled Pl asma Mass Spectrometr y (LA-I CP-MS) and Electron Microprobe Analysis (EMPA). The Raman-band at 1067-1072 cm -1 and the IR-band at 1071-1207 cm -1 have been assi gned till now either to Si-O or to Be-O by di fferent studies. Following the findings in this study that the position and Full Width at HalfMaximum (FWHM) of these bands were related to the concentration of silicon but not that of beryllium, it stated that these bands were generated by the...

  • TL2.pdf.jpg
  • Article


  • Authors: Tran, Thi Ha; Bui, Thi Huyen; Nguyen, Viet Tuyen (2016)

  • Well-aligned CuO nanorods were successfully prepared by thermal oxidation method. The effect of annealing time and annealing temperature on the morphology of the nanorods were studied by scanning electron microscopy. The results show that annealing temperature plays a more critical role in affecting the diameter and density of nanorods. Besides SEM images, the effect of annealing time and temperatures on the structure of the product were also studied by X-ray diffraction and Raman spectroscopy. The diameter of CuO nanorods varies from 30 nm to above 100 nm when annealing temperature changes from 400 °C to 600 °C, while the length of the rods is up to several tens of micrometers. The...

  • 1-s2.0-S2468217918300893-main.pdf.jpg
  • Article


  • Authors: Tran, Thuat Nguyen; An, Ngoc Mai; Nguyen, Ky Duyen; Nguyen, Thi Duyen; Truong, Thanh Tu (2018)

  • Organometal halide perovskites have been studied extensively during the last ten years for their interesting applications in solar cells and optoelectronics. One drawback of these materials is the presence of lead inside the compound, thus limiting their practical applications. Replacing lead with tin has been one of the implemented approaches for lead-free perovskites. In this paper, we report on the synthesis of organo tin mixed halide perovskites CH3NH3SnBrxCl3-xat room temperature in an aqueous acidic mixture between HCl and H3PO2without the need of protecting perovskites against moisture. X-ray diffraction patterns show that the tin mixed halide perovskites adopt the trigonal p...

Browsing by Subject Raman

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 3 to 9 of 9
  • Effect of Annealing Temperature on Cu2O Thin Films Prepared by Thermal Oxidation Method.pdf.jpg
  • Article


  • Authors: Tran, Thi Ha; Nguyen, Thi Huyen Trang; Bach, Thanh Cong; Nguyen, Thi Dieu Thu; Nguyen, Thanh Binh; Nguyen, Viet Tuyen; Pham, Nguyen Hai (2020)

  • We report a facile process to fabricate cuprous thin films by thermal oxidation of copper substrates. Structure and phase identification were studied by X-ray diffraction measurement and Raman spectroscopy. Scanning electron microscopy was utilized to study surface morphology of the as-fabricated thin films and optical properties of the samples were investigated by diffused reflectance spectroscopy. The study shows that cuprous thin films could be obtained by controlling annealing temperature in the region of 200-300 oC.

  • 54.pdf.jpg
  • Article


  • Authors: Dao, Viet Thang; Du, Thi Xuan Thao; Le, Thi Mai Oanh; Nguyen, Van Minh (2015)

  • Structural, optical and magnetic properties of BiFeO3 and Bi0.9Nd0.1Fe0.95TM0.05O3 (TM = Ni, Co) polycrystallines prepared by sol–gel method have been investigated. X-ray diffraction (XRD) patterns reveal that all samples crystalize in rhombohedrally distorted perovskite structure belonging to R3C space group. The analysis results of both XRD and Raman scattering show the increase of lattice distortion with the co-replacing of Nd and TM ions into A and B sites respectively. All samples exhibit a weak ferromagnetic behavior at room temperature with the enhancement of the magnetization in Nd and TM co-doped samples.

  • 8.pdf.jpg
  • Article


  • Authors: Dao, Viet Thang; Du, Thi Xuan Thao; Le, Thi Mai Oanh; Nguyen, Van Minh (2015)

  • Structural, optical and magnetic properties of BiFeO3 and Bi0.9Nd0.1Fe0.95TM0.05O3 (TM = Ni, Co) polycrystallines prepared by sol–gel method have been investigated. X-ray diffraction (XRD) patterns reveal that all samples crystalize in rhombohedrally distorted perovskite structure belonging to R3C space group. The analysis results of both XRD and Raman scattering show the increase of lattice distortion with the co-replacing of Nd and TM ions into A and B sites respectively. All samples exhibit a weak ferromagnetic behavior at room temperature with the enhancement of the magnetization in Nd and TM co-doped samples.

  • 4280-97-8419-1-10-20180924.pdf.jpg
  • Article


  • Authors: Pham, Thi Hong; Nguyen, Viet Tuyen; Tran, Thi Ha (2018)

  • Cu2ZnSnS4 (CZTS) is a p-type semiconductor with high absorption coefficient and direct bandgap from 1 to 1.5 eV, which is ideal for making absorber layer for solar cell. However, it is difficult to get single phase of CZTS due to the competitive formation of binary and ternary secondary phases. In this paper, we prepared CZTS nanoparticles by hydrothermal method and investigate the influence of hydrothermal temperature on the product. Raman scattering, X-ray diffraction, scanning electron microcopy, energy dispersive X-ray spectroscopy and diffusion reflective measurement were applied to characterize the products. The products are high quality nanocrystals of kesterite phase with unif...

  • TC_02644.pdf.jpg
  • Article


  • Authors: Le, Thi Thu Huong; Häger, Tobias (2010)

  • Natural and synthetic beryl, Al2 Be3Si 6O18, from various deposits and manufacturers were investigated with Raman, I R spectroscopy, Laser Ablat ion I nductivel y Coupled Pl asma Mass Spectrometr y (LA-I CP-MS) and Electron Microprobe Analysis (EMPA). The Raman-band at 1067-1072 cm -1 and the IR-band at 1071-1207 cm -1 have been assi gned till now either to Si-O or to Be-O by di fferent studies. Following the findings in this study that the position and Full Width at HalfMaximum (FWHM) of these bands were related to the concentration of silicon but not that of beryllium, it stated that these bands were generated by the...

  • TL2.pdf.jpg
  • Article


  • Authors: Tran, Thi Ha; Bui, Thi Huyen; Nguyen, Viet Tuyen (2016)

  • Well-aligned CuO nanorods were successfully prepared by thermal oxidation method. The effect of annealing time and annealing temperature on the morphology of the nanorods were studied by scanning electron microscopy. The results show that annealing temperature plays a more critical role in affecting the diameter and density of nanorods. Besides SEM images, the effect of annealing time and temperatures on the structure of the product were also studied by X-ray diffraction and Raman spectroscopy. The diameter of CuO nanorods varies from 30 nm to above 100 nm when annealing temperature changes from 400 °C to 600 °C, while the length of the rods is up to several tens of micrometers. The...

  • 1-s2.0-S2468217918300893-main.pdf.jpg
  • Article


  • Authors: Tran, Thuat Nguyen; An, Ngoc Mai; Nguyen, Ky Duyen; Nguyen, Thi Duyen; Truong, Thanh Tu (2018)

  • Organometal halide perovskites have been studied extensively during the last ten years for their interesting applications in solar cells and optoelectronics. One drawback of these materials is the presence of lead inside the compound, thus limiting their practical applications. Replacing lead with tin has been one of the implemented approaches for lead-free perovskites. In this paper, we report on the synthesis of organo tin mixed halide perovskites CH3NH3SnBrxCl3-xat room temperature in an aqueous acidic mixture between HCl and H3PO2without the need of protecting perovskites against moisture. X-ray diffraction patterns show that the tin mixed halide perovskites adopt the trigonal p...