Browsing by Subject Raman

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  • TC_02644.pdf.jpg
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  • 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 7 to 9 of 9
  • 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...