Browsing by Subject Raman spectroscopy

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  • e33.2.4.pdf.jpg
  • Article


  • Authors: Ly, Thuy Duong; Le, Thi Thu Huong (2017)

  • Aquamarine is a kind of gemstone having attractive color, valuable and being a potential material in gemological industry. In Vietnam, Thach Khoan area has become a noticeable location to explore aquamarine. However, the researches of aquamarine are still limited. Therefore, this study was conducted to determine the characteristics of aquamarine. Eight aquamarine samples from granitic pegmatites in Thach Khoan commune, Thanh Son District, Phu Tho Province were investigated by classical gemological methods, Electron Probe Micro-analysis (EMPA) and Laser Ablation – Inductively Coupled Plasma – Mass Spectrometry (LA-ICP-MS) methods, Raman and Fourier transform infrared (FTIR) spectroscop...

  • Raman-and-scanning-tunneling-spectroscopic-inv_2018_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Sukumaran, Sheena S.; Rekha, C.R.; Resmi, A.N.; Jinesh, K.B.; Gopchandran, K.G. (2018)

  • Graphene-silver (G-Ag) nanocomposites were prepared using liquid phase exfoliation of graphiteflakes followed by a reduction of silver nitrate. The plasmonic characteristics of these nanocomposites are highly sensitive to the Ag concentration in thefilms. Raman spectroscopic investigations indicated that the effect of the surface-enhanced Raman scattering is present significantly in the Raman spectra of G-Ag nanocomposites. The intensity of the D, G, and 2D Raman bands is found to increase with silver con-centration. The interaction between graphene and silver nanoparticles causes the G-band to split depending on the concentration of Ag. Scanning tunneling spectroscopic investigations...

  • Role of La3þ ion substitution sites on the photoluminescence.pdf.jpg
  • Article


  • Authors: Jyothi, G.; Gopchandran, K.G. (2020)

  • The consequence of the site selective substitution of La3þ ions in modifying the local crystal structure in red emitting titanate perovskites and the resulting enhancement of the luminescence properties were investigated in two distinct series of red phosphors of Sr1-x-yLaxTiO3:yEu3þ and Sr1-x/2-yLaxTi1-x/2O3:yEu3þ. Herein, the red emission line was found sharply magnified for the substitutions at the Sr2þ sites whereas broad peaks resembling the emission from the La2O3:Eu3þ red phosphor were detected for the substitution at both Sr2þ and Ti4þ sites, in the experiment of altering substitution sites of the La3þ ions in Sr1- xTiO3:xEu3þ. The local asymmetry induced by the substitution ...

  • 111.pdf.jpg
  • Article


  • Authors: Le, Van Ngoc; Tran, Cao Vinh; Le, Quang Toai; Nguyen, Duc Thinh; Huynh, Thanh Dat (2009)

  • Tungsten oxide film was deposited on ITO-coated glass by using RF magnetron sputtering method from WO3 ceramic target. Thin film preparation – process took place in Ar + O2 plasma. The dependence of tungsten oxide film structure on experiment conditions was investigated by X-ray diffraction (XRD) Raman spectroscopy. In this paper, we considered that the thickness of ITO layers about 150nm to 350nm clearly effects on the Raman and XRD spectrograms of WO3 films.

  • ZnO-nanostructures-with-tunable-visible-luminescence-Effects-of-kinetics-of-chemical-reduction-and-annealing_2017_Journal-of-Science-Advanced-Material.pdf.jpg
  • Article


  • Authors: Raji, R.; Gopchandran, K.G. (2017)

  • Highly crystalline ZnO nanoparticles were synthesized using a co-precipitation method. The morphology and optical properties of these nanoparticles are found to be highly sensitive to the growth parameters such as the concentration of reducing agent and annealing temperature. Indeed, the concentration of the reducing agent can alter the morphology of nanoparticles from quasi-spherical to rod-like and then to flower-like structures. Attempts were made to tune the emission wavelength over the visible region by varying the kinetics of chemical reduction and annealing. The possibility of tuning the emission in a visible range from orange to red and then to green by changing the nature of ...

Browsing by Subject Raman spectroscopy

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 1 to 5 of 5
  • e33.2.4.pdf.jpg
  • Article


  • Authors: Ly, Thuy Duong; Le, Thi Thu Huong (2017)

  • Aquamarine is a kind of gemstone having attractive color, valuable and being a potential material in gemological industry. In Vietnam, Thach Khoan area has become a noticeable location to explore aquamarine. However, the researches of aquamarine are still limited. Therefore, this study was conducted to determine the characteristics of aquamarine. Eight aquamarine samples from granitic pegmatites in Thach Khoan commune, Thanh Son District, Phu Tho Province were investigated by classical gemological methods, Electron Probe Micro-analysis (EMPA) and Laser Ablation – Inductively Coupled Plasma – Mass Spectrometry (LA-ICP-MS) methods, Raman and Fourier transform infrared (FTIR) spectroscop...

  • Raman-and-scanning-tunneling-spectroscopic-inv_2018_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Sukumaran, Sheena S.; Rekha, C.R.; Resmi, A.N.; Jinesh, K.B.; Gopchandran, K.G. (2018)

  • Graphene-silver (G-Ag) nanocomposites were prepared using liquid phase exfoliation of graphiteflakes followed by a reduction of silver nitrate. The plasmonic characteristics of these nanocomposites are highly sensitive to the Ag concentration in thefilms. Raman spectroscopic investigations indicated that the effect of the surface-enhanced Raman scattering is present significantly in the Raman spectra of G-Ag nanocomposites. The intensity of the D, G, and 2D Raman bands is found to increase with silver con-centration. The interaction between graphene and silver nanoparticles causes the G-band to split depending on the concentration of Ag. Scanning tunneling spectroscopic investigations...

  • Role of La3þ ion substitution sites on the photoluminescence.pdf.jpg
  • Article


  • Authors: Jyothi, G.; Gopchandran, K.G. (2020)

  • The consequence of the site selective substitution of La3þ ions in modifying the local crystal structure in red emitting titanate perovskites and the resulting enhancement of the luminescence properties were investigated in two distinct series of red phosphors of Sr1-x-yLaxTiO3:yEu3þ and Sr1-x/2-yLaxTi1-x/2O3:yEu3þ. Herein, the red emission line was found sharply magnified for the substitutions at the Sr2þ sites whereas broad peaks resembling the emission from the La2O3:Eu3þ red phosphor were detected for the substitution at both Sr2þ and Ti4þ sites, in the experiment of altering substitution sites of the La3þ ions in Sr1- xTiO3:xEu3þ. The local asymmetry induced by the substitution ...

  • 111.pdf.jpg
  • Article


  • Authors: Le, Van Ngoc; Tran, Cao Vinh; Le, Quang Toai; Nguyen, Duc Thinh; Huynh, Thanh Dat (2009)

  • Tungsten oxide film was deposited on ITO-coated glass by using RF magnetron sputtering method from WO3 ceramic target. Thin film preparation – process took place in Ar + O2 plasma. The dependence of tungsten oxide film structure on experiment conditions was investigated by X-ray diffraction (XRD) Raman spectroscopy. In this paper, we considered that the thickness of ITO layers about 150nm to 350nm clearly effects on the Raman and XRD spectrograms of WO3 films.

  • ZnO-nanostructures-with-tunable-visible-luminescence-Effects-of-kinetics-of-chemical-reduction-and-annealing_2017_Journal-of-Science-Advanced-Material.pdf.jpg
  • Article


  • Authors: Raji, R.; Gopchandran, K.G. (2017)

  • Highly crystalline ZnO nanoparticles were synthesized using a co-precipitation method. The morphology and optical properties of these nanoparticles are found to be highly sensitive to the growth parameters such as the concentration of reducing agent and annealing temperature. Indeed, the concentration of the reducing agent can alter the morphology of nanoparticles from quasi-spherical to rod-like and then to flower-like structures. Attempts were made to tune the emission wavelength over the visible region by varying the kinetics of chemical reduction and annealing. The possibility of tuning the emission in a visible range from orange to red and then to green by changing the nature of ...