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Browsing by Author Nguyen, The Binh

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  • 199.pdf.jpg
  • Article

  • Design and construction of a laser raman spectrometer to study hydrocarbon extracts from petroleum of Vietnam

    • Authors: Pham, Van Ben; Nguyen, The Binh; Nguyen, Huy Binh (2004)

  • We studied to design and construct a laser Raman spectrometer using an Argon laser and a double grating monochromator G D M -1000. The efficiency of the laser Raman scattering detection system was estimated by the obtained Raman spectra of some standard solution such as CC I4, C6H6 and some hydrocarbon extracts from petroleum of Vietnam . This result is an important step to study Raman spectra of petroleum extracts in Vietnam as well as Raman spectra of photo-electronic materials.
  • 35.pdf.jpg
  • Article

  • Preparation of Au-Ag Alloy Nanoparticles for Surface Enhanced Raman Scattering

    • Authors: Nguyen, The Binh; Nguyen, Quang Dong (2015)

  • Using a laser-based method we study the preparation of Au-Ag alloy nanoparticles for Surface enhanced Raman scattering (SERS). Au and Ag nanoparticles (NPs) were prepared in distilled water by pulse laser ablation using 1064nm wavelength of Nd:YAG laser. Au-Ag alloy NPs were prepared by irradiating the mixture of colloidal Au and Ag NPs with the 532 nm second harmonic wavelength of Nd:YAG laser. The Au NPs, Ag NPs and Au-Ag alloy NPs were characterized by using UV-vis absorption spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction measurements. The Au-Ag alloy NPs were used to fabricate nanostructure substrates for SERS measurement. Raman spectra were measured by...
  • 30.pdf.jpg
  • Article

  • Preparation of Metal, Alloy and Semiconductor Nanoparticles

    • Authors: Tran, Trong Duc; Ngo, Gia Long; Hoang, Ha My; Nguyen, The Binh (2016)

  • By using Nd: YAG laser, we have successfully prepared noble metal nanoparticles (Au, Ag), semi - conductor nanoparticles (Si), and metalic alloy nanoparticles (Au/Ag) in different clean liquids (such as pure water, ethanol....). Both metal and semi - conductor nanoparticles were synthesized by laser ablation of pure metal or semi - conductor plate in liquids. Au/Ag alloy nanoparticles were prepared by laser induced synthesis from a mixture of colloidal Au and Ag nanoparticles. The influence of the laser power, laser irradiation time and laser wavelength in the synthesis process were studied. The structure and morphology of nanoparticles were characterized by using UV - vis absorptio...
  • 57.pdf.jpg
  • Article

  • Preparation of Platinum Nanoparticles in Solution of Polyvinyl Pyrrolydone (PVP) by Laser Ablation Method

    • Authors: Nguyen, The Binh; Nguyen, Dinh Thanh; Nguyen, Quang Dong; Nguyen, Thi Trinh (2014)

  • Using Nd:YAG laser we studied to produce platinum nanoparticles (PtNPs) in solution of polyvinyl pyrrolidone (C6H9NO)n (PVP) by laser ablation method. The influence of average laser power, laser irradiation time, laser wave length and concentration of PVP solution in water on morphology, size distribution of PtNPs was investigated. The mean diameter of the PtNPs in 0.01M PVP solution was of 9 nm. The results on an optimum laser ablation process for preparation of PtNPs in PVP solution were discussed in this paper.
  • 225.pdf.jpg
  • Article

  • Properties of second harmonic and sum frequency generation in polycristalline ZnSe

    • Authors: Nguyen, The Binh (2003)

  • Second harminic generation (SHG) and Sum frequencvy generation (SFG) of polycrystalline ZnSe were studied in a femtosecond time scale. Beside SHG and SFG dot patterns in polycrystalline ZnSe were found SFG ring pattern and the optimal orientation of the ZnSe crystal to obtain SFG ring pattern.
  • 88.pdf.jpg
  • Article

  • Random laser rn ZnO powder pumped by picosecond pulses

    • Authors: Nguyen, The Binh; Pham, Van Thin; Pham, Thu Nga; Nguyen, Anh Tuan (2011)

  • We report ow studies of random laser from ZnO powder at room temperature. The powder of ZnO colloidal spheres was synthesized by hydrolysis of Zinc acetate dehydrate. The random lasing around 380nm was produced from a layer of the ZnO powder pumped by the third harmonics (:SSnm) of a picosecond mode locked Nd:YAG laser (1L2143B-- Ekspla). Above a pump threshold, discrete lasing modes of random laser action with resonant feedback appeared in the emission speckum. Our experimental results show that random lasing can be produced from a layer of ZnO spherical nanoparticle powder on glass substrate.
  • 136.pdf.jpg
  • Article

  • Silver nanoparticles prepared by laser ablation and their optical characteristics

    • Authors: Nguyen, The Binh; Do, Thi Ly; Nguyen, Thi Hue; Le, Tu Quyen (2008)

  • Laser-induced thermal explosion of metallic nanoparticles originates from nonlinear optical effect. Nonlinear optical properties of nanoparticle materials depend strongly on their size and shape. Several methods were proposed to produce nanoparticles of a controlled size and welldefined distribution. We studied to prepare silver nanoparticles by laser ablation. The characteristic spectral feature o f the silver nanoparticles (peak around 400nm ) was found in the absorption spectra measured by a UV-Vis 2450 spectrom eter. The size and shape distribution of silver nanopaiticlcs was observed and analyzed by a transmission electron microscope (JEM 1010-JEOL). Two different surfactants we...
  • 94.pdf.jpg
  • Article

  • Surface-enhanced raman scattering from a layer of gold nanoparticles

    • Authors: Nguyen, The Binh; Nguyen, Thanh Dinh; Nguyen, Quang Dong; Vu, Thi Khanh Thu (2010)

  • We studied to prepare subshates for Surface-Enhance Raman Scattering (SERS). Gold nanoparticles were produced by laser ablation of gold plate in ethanol. The average size of gold nanoparticles is l3nm. The gold nanoparticle colloid was allowed to dry on a silicon wafer to prepare SERS substrate. Using the gold nanoparticle substrates we could obtain SERS spectrum of Rhodamine 6G molecules adsorbed on gold nanoparticles. The Raman signal was enhanced strongly by our SERS subshate. This result demonstrates that the metal nanoparticles synthesized by laser ablation in clean liquid can be used to prepare SERS substrate for molecular detection in our laboratory.

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Browsing by Author Nguyen, The Binh

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 9 of 9
  • 199.pdf.jpg
  • Article

  • Design and construction of a laser raman spectrometer to study hydrocarbon extracts from petroleum of Vietnam

    • Authors: Pham, Van Ben; Nguyen, The Binh; Nguyen, Huy Binh (2004)

  • We studied to design and construct a laser Raman spectrometer using an Argon laser and a double grating monochromator G D M -1000. The efficiency of the laser Raman scattering detection system was estimated by the obtained Raman spectra of some standard solution such as CC I4, C6H6 and some hydrocarbon extracts from petroleum of Vietnam . This result is an important step to study Raman spectra of petroleum extracts in Vietnam as well as Raman spectra of photo-electronic materials.
  • 35.pdf.jpg
  • Article

  • Preparation of Au-Ag Alloy Nanoparticles for Surface Enhanced Raman Scattering

    • Authors: Nguyen, The Binh; Nguyen, Quang Dong (2015)

  • Using a laser-based method we study the preparation of Au-Ag alloy nanoparticles for Surface enhanced Raman scattering (SERS). Au and Ag nanoparticles (NPs) were prepared in distilled water by pulse laser ablation using 1064nm wavelength of Nd:YAG laser. Au-Ag alloy NPs were prepared by irradiating the mixture of colloidal Au and Ag NPs with the 532 nm second harmonic wavelength of Nd:YAG laser. The Au NPs, Ag NPs and Au-Ag alloy NPs were characterized by using UV-vis absorption spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction measurements. The Au-Ag alloy NPs were used to fabricate nanostructure substrates for SERS measurement. Raman spectra were measured by...
  • 30.pdf.jpg
  • Article

  • Preparation of Metal, Alloy and Semiconductor Nanoparticles

    • Authors: Tran, Trong Duc; Ngo, Gia Long; Hoang, Ha My; Nguyen, The Binh (2016)

  • By using Nd: YAG laser, we have successfully prepared noble metal nanoparticles (Au, Ag), semi - conductor nanoparticles (Si), and metalic alloy nanoparticles (Au/Ag) in different clean liquids (such as pure water, ethanol....). Both metal and semi - conductor nanoparticles were synthesized by laser ablation of pure metal or semi - conductor plate in liquids. Au/Ag alloy nanoparticles were prepared by laser induced synthesis from a mixture of colloidal Au and Ag nanoparticles. The influence of the laser power, laser irradiation time and laser wavelength in the synthesis process were studied. The structure and morphology of nanoparticles were characterized by using UV - vis absorptio...
  • 57.pdf.jpg
  • Article

  • Preparation of Platinum Nanoparticles in Solution of Polyvinyl Pyrrolydone (PVP) by Laser Ablation Method

    • Authors: Nguyen, The Binh; Nguyen, Dinh Thanh; Nguyen, Quang Dong; Nguyen, Thi Trinh (2014)

  • Using Nd:YAG laser we studied to produce platinum nanoparticles (PtNPs) in solution of polyvinyl pyrrolidone (C6H9NO)n (PVP) by laser ablation method. The influence of average laser power, laser irradiation time, laser wave length and concentration of PVP solution in water on morphology, size distribution of PtNPs was investigated. The mean diameter of the PtNPs in 0.01M PVP solution was of 9 nm. The results on an optimum laser ablation process for preparation of PtNPs in PVP solution were discussed in this paper.
  • 225.pdf.jpg
  • Article

  • Properties of second harmonic and sum frequency generation in polycristalline ZnSe

    • Authors: Nguyen, The Binh (2003)

  • Second harminic generation (SHG) and Sum frequencvy generation (SFG) of polycrystalline ZnSe were studied in a femtosecond time scale. Beside SHG and SFG dot patterns in polycrystalline ZnSe were found SFG ring pattern and the optimal orientation of the ZnSe crystal to obtain SFG ring pattern.
  • 88.pdf.jpg
  • Article

  • Random laser rn ZnO powder pumped by picosecond pulses

    • Authors: Nguyen, The Binh; Pham, Van Thin; Pham, Thu Nga; Nguyen, Anh Tuan (2011)

  • We report ow studies of random laser from ZnO powder at room temperature. The powder of ZnO colloidal spheres was synthesized by hydrolysis of Zinc acetate dehydrate. The random lasing around 380nm was produced from a layer of the ZnO powder pumped by the third harmonics (:SSnm) of a picosecond mode locked Nd:YAG laser (1L2143B-- Ekspla). Above a pump threshold, discrete lasing modes of random laser action with resonant feedback appeared in the emission speckum. Our experimental results show that random lasing can be produced from a layer of ZnO spherical nanoparticle powder on glass substrate.
  • 136.pdf.jpg
  • Article

  • Silver nanoparticles prepared by laser ablation and their optical characteristics

    • Authors: Nguyen, The Binh; Do, Thi Ly; Nguyen, Thi Hue; Le, Tu Quyen (2008)

  • Laser-induced thermal explosion of metallic nanoparticles originates from nonlinear optical effect. Nonlinear optical properties of nanoparticle materials depend strongly on their size and shape. Several methods were proposed to produce nanoparticles of a controlled size and welldefined distribution. We studied to prepare silver nanoparticles by laser ablation. The characteristic spectral feature o f the silver nanoparticles (peak around 400nm ) was found in the absorption spectra measured by a UV-Vis 2450 spectrom eter. The size and shape distribution of silver nanopaiticlcs was observed and analyzed by a transmission electron microscope (JEM 1010-JEOL). Two different surfactants we...
  • 94.pdf.jpg
  • Article

  • Surface-enhanced raman scattering from a layer of gold nanoparticles

    • Authors: Nguyen, The Binh; Nguyen, Thanh Dinh; Nguyen, Quang Dong; Vu, Thi Khanh Thu (2010)

  • We studied to prepare subshates for Surface-Enhance Raman Scattering (SERS). Gold nanoparticles were produced by laser ablation of gold plate in ethanol. The average size of gold nanoparticles is l3nm. The gold nanoparticle colloid was allowed to dry on a silicon wafer to prepare SERS substrate. Using the gold nanoparticle substrates we could obtain SERS spectrum of Rhodamine 6G molecules adsorbed on gold nanoparticles. The Raman signal was enhanced strongly by our SERS subshate. This result demonstrates that the metal nanoparticles synthesized by laser ablation in clean liquid can be used to prepare SERS substrate for molecular detection in our laboratory.