Browsing by Subject Co-precipitation

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  • 76.pdf.jpg
  • Article


  • Authors: Do, Quoc Hung; Tran, Quang Dat (2011)

  • Nanostructured Zn0.5Ni0.5Fe2O4 ferrite is a promising magnetic material for different applications because of it good performances. In this paper, the authors present high production method for preparation of magnetic nanomaterial Zn0.5Ni0.5Fe2O4 - the method of spraying – co-precipitation. The advantages of this method are high productivity, good repeatability and high magnetic performances of the fabricated materials. Nanostructured Zn0.5Ni0.5Fe2O4 have been prepared by co-precipitation using spraying technique. Different techniques as XRD, TEM, SEM techniques were used to characterize obtained material. It is shown that prepared by this method Zn0.5Ni0.5Fe2O4 has face-centered cubi...

  • 4273-97-8341-2-10-20180807.pdf.jpg
  • Article


  • Authors: Nguyen, Xuan Sang; Le, Phuoc Sang; Nguyen, Minh Quan; Nguyen, Huu Tho (2018)

  • Herein we study point defects and correlation to photoluminescence in ZnO nanorod. ZnO mirco/nanorod structure was successfully fabricated by co-precipitation method with highly homogeneous characteristics. When ion Mn+2 introduced into ZnO structure, the d-spacing distance of ZnO was increased from 0.248 nm to 0.295 nm due to the larger ionic radius of Mn2+ in comparison to Zn2+. The photoluminescence emission evolution of ZnO through doping and annealing processes hinted the relation of point defect transformations. We found that zinc interstitial, zinc vacancy and its related defects were responsible mainly for photoluminescence emission in annealing and/or Mn2+ doped samples.

  • Size-dependent-magnetic-responsiveness-of-magnetit_2018_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: Bui, Quang Thanh; Ton, Nu-Cam Suong; Duong, Trong Anh; Tran, Thai Hoa (2018)

  • The dependence of the magnetic responsiveness on magnetite nanoparticle size has been studied. Monodisperse magnetite nanoparticles of 10 nm diameter were prepared by an ultrasonically enhanced co-precipitation procedure. A carboxyl-functionalised solvothermal approach was applied to synthesise magnetite nanoparticles with an average size of 30 nm. The particle sizes and their distribution have been determined by analysing TEM images and considering nanoparticle formation mechanisms. The magnetic characterisation revealed an inverse dependence between the magnetite nanoparticle size and its ability to respond to external magnetic fields, which was explained by the decrease of magnetic...

  • Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method.pdf.jpg
  • Article


  • Authors: Basha, Sk. Johny; Khidhirbrahmendra, V.; Madhavi, J.; Thampy, U.S. Udayachandran; Reddy, Ch. Venkata; Ravikumar, R.V.S.S.N. (2019)

  • Cr3þ ions doped ZnS nanocrystals were synthesized using the co-precipitation method. The as-prepared sample was characterized to investigate the magnetic and thermal properties along with its structural and spectral studies. X-ray diffraction (XRD) analysis confirms the cubic zinc blend structure, and the mean crystallite size is evaluated to be 4.7 nm. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images indicate stone-like structures. The deposition of Cr3þ ions in ZnS nanocrystals is evidenced by energy dispersive spectroscopy (EDS) analysis. From the optical absorption data, the bands in the UV-VIS region are recognized as the characteristic bands ...

  • Surface-protective-assistance-of-ultrasound-in-synthes_2018_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Bui, Q. T.; Ngo, T. M. H.; Tran, T. H. (2018)

  • Ultrasound was throughout employed to enhance the co-precipitation process for the synthesis of magnetite nanoparticles (Fe3O4) and the St€ ober approach for the preparation of magnetite-silica nanocomposites (Fe3O4/SiO2). The synthesised magnetite nanoparticles exhibited single-domain nano-crystallites with a uniform spherical morphology, a narrow size distribution (ca. 10 nm), and negligible coercive field (~5 Oe). The prepared magnetite-silica nanocomposites possessed a mono core-shell structure with spherical morphology, biologically coherent size (ca. 100 nm), and discrete mono-domain behaviour. The crystalline structure-magnetic behaviour relationships of the nanomaterials were ...

  • 41.pdf.jpg
  • Article


  • Authors: Duong, Thi Mai Huong; Nguyen, Thi Tien; Le, Van Vu; Nguyen, Ngoc Long (2015)

  • CeF3nanoparticles doped with 0; 1.0; 1.5; 2.0; 2.5; 3.0 and 4.0 mol% Sm3+ were prepared by co-precipitation technique. These nanoparticles were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), photoluminescence excitation (PLE) spectra, energy-dispersive X-ray (EDS) and absorption spectra. The PL spectra exhibit a group of four emission lines, which are assigned to the transitions from the excited state 4G5/2 to the ground states 6HJ with J = 5/2; 7/2; 9/2 and 11/2 of Sm3+ ion. The intensity of PL related to Sm3+ ion reached to a maximum when the Sm dopant content was 2 mol%. The PLE spectra show 8 lines, which are attributed to the a...

Browsing by Subject Co-precipitation

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 6 of 6
  • 76.pdf.jpg
  • Article


  • Authors: Do, Quoc Hung; Tran, Quang Dat (2011)

  • Nanostructured Zn0.5Ni0.5Fe2O4 ferrite is a promising magnetic material for different applications because of it good performances. In this paper, the authors present high production method for preparation of magnetic nanomaterial Zn0.5Ni0.5Fe2O4 - the method of spraying – co-precipitation. The advantages of this method are high productivity, good repeatability and high magnetic performances of the fabricated materials. Nanostructured Zn0.5Ni0.5Fe2O4 have been prepared by co-precipitation using spraying technique. Different techniques as XRD, TEM, SEM techniques were used to characterize obtained material. It is shown that prepared by this method Zn0.5Ni0.5Fe2O4 has face-centered cubi...

  • 4273-97-8341-2-10-20180807.pdf.jpg
  • Article


  • Authors: Nguyen, Xuan Sang; Le, Phuoc Sang; Nguyen, Minh Quan; Nguyen, Huu Tho (2018)

  • Herein we study point defects and correlation to photoluminescence in ZnO nanorod. ZnO mirco/nanorod structure was successfully fabricated by co-precipitation method with highly homogeneous characteristics. When ion Mn+2 introduced into ZnO structure, the d-spacing distance of ZnO was increased from 0.248 nm to 0.295 nm due to the larger ionic radius of Mn2+ in comparison to Zn2+. The photoluminescence emission evolution of ZnO through doping and annealing processes hinted the relation of point defect transformations. We found that zinc interstitial, zinc vacancy and its related defects were responsible mainly for photoluminescence emission in annealing and/or Mn2+ doped samples.

  • Size-dependent-magnetic-responsiveness-of-magnetit_2018_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: Bui, Quang Thanh; Ton, Nu-Cam Suong; Duong, Trong Anh; Tran, Thai Hoa (2018)

  • The dependence of the magnetic responsiveness on magnetite nanoparticle size has been studied. Monodisperse magnetite nanoparticles of 10 nm diameter were prepared by an ultrasonically enhanced co-precipitation procedure. A carboxyl-functionalised solvothermal approach was applied to synthesise magnetite nanoparticles with an average size of 30 nm. The particle sizes and their distribution have been determined by analysing TEM images and considering nanoparticle formation mechanisms. The magnetic characterisation revealed an inverse dependence between the magnetite nanoparticle size and its ability to respond to external magnetic fields, which was explained by the decrease of magnetic...

  • Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method.pdf.jpg
  • Article


  • Authors: Basha, Sk. Johny; Khidhirbrahmendra, V.; Madhavi, J.; Thampy, U.S. Udayachandran; Reddy, Ch. Venkata; Ravikumar, R.V.S.S.N. (2019)

  • Cr3þ ions doped ZnS nanocrystals were synthesized using the co-precipitation method. The as-prepared sample was characterized to investigate the magnetic and thermal properties along with its structural and spectral studies. X-ray diffraction (XRD) analysis confirms the cubic zinc blend structure, and the mean crystallite size is evaluated to be 4.7 nm. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images indicate stone-like structures. The deposition of Cr3þ ions in ZnS nanocrystals is evidenced by energy dispersive spectroscopy (EDS) analysis. From the optical absorption data, the bands in the UV-VIS region are recognized as the characteristic bands ...

  • Surface-protective-assistance-of-ultrasound-in-synthes_2018_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Bui, Q. T.; Ngo, T. M. H.; Tran, T. H. (2018)

  • Ultrasound was throughout employed to enhance the co-precipitation process for the synthesis of magnetite nanoparticles (Fe3O4) and the St€ ober approach for the preparation of magnetite-silica nanocomposites (Fe3O4/SiO2). The synthesised magnetite nanoparticles exhibited single-domain nano-crystallites with a uniform spherical morphology, a narrow size distribution (ca. 10 nm), and negligible coercive field (~5 Oe). The prepared magnetite-silica nanocomposites possessed a mono core-shell structure with spherical morphology, biologically coherent size (ca. 100 nm), and discrete mono-domain behaviour. The crystalline structure-magnetic behaviour relationships of the nanomaterials were ...

  • 41.pdf.jpg
  • Article


  • Authors: Duong, Thi Mai Huong; Nguyen, Thi Tien; Le, Van Vu; Nguyen, Ngoc Long (2015)

  • CeF3nanoparticles doped with 0; 1.0; 1.5; 2.0; 2.5; 3.0 and 4.0 mol% Sm3+ were prepared by co-precipitation technique. These nanoparticles were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), photoluminescence excitation (PLE) spectra, energy-dispersive X-ray (EDS) and absorption spectra. The PL spectra exhibit a group of four emission lines, which are assigned to the transitions from the excited state 4G5/2 to the ground states 6HJ with J = 5/2; 7/2; 9/2 and 11/2 of Sm3+ ion. The intensity of PL related to Sm3+ ion reached to a maximum when the Sm dopant content was 2 mol%. The PLE spectra show 8 lines, which are attributed to the a...