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Browsing by Author Pham, Thu Nga

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  • 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.
  • 122.pdf.jpg
  • Article

  • Sol-gel synthesis and particle size characterization of CdSe Quantum dots

    • Authors: Khong, Cat Cuong; Trinh, Duc Thien; Pham, Thu Nga; Nguyen, Van Minh; Nguyen, Van Hung (2009)

  • In this article, we report on the preparation of CdSe quantum dots (QDs) by sol-gel method and their optical properties. The average size of QDs is also estimated by using various ways, such as the Scherer’s formula. The Effros-Brus-Kayanum a's theoretical expression, TEM etc. The TEM images of samples show that the mean sizes of QDs are 4 nm. The mean sizes of QDs are smaller than that of other methods and arranging from 2 to 3.6 nm.

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Browsing by Author Pham, Thu Nga

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 2 of 2
  • 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.
  • 122.pdf.jpg
  • Article

  • Sol-gel synthesis and particle size characterization of CdSe Quantum dots

    • Authors: Khong, Cat Cuong; Trinh, Duc Thien; Pham, Thu Nga; Nguyen, Van Minh; Nguyen, Van Hung (2009)

  • In this article, we report on the preparation of CdSe quantum dots (QDs) by sol-gel method and their optical properties. The average size of QDs is also estimated by using various ways, such as the Scherer’s formula. The Effros-Brus-Kayanum a's theoretical expression, TEM etc. The TEM images of samples show that the mean sizes of QDs are 4 nm. The mean sizes of QDs are smaller than that of other methods and arranging from 2 to 3.6 nm.