Preparation and characterization of CdS nanoparticle on the surface of silica nanoparticles

실리카 나노입자 표면에 CdS 나노입자의 제조 및 평가

  • Kang, Yun-Ok (Department of Chemistry, BK 21 NanoBiosensor Research Team, Hannam University) ;
  • Choi, Seong-Ho (Department of Chemistry, BK 21 NanoBiosensor Research Team, Hannam University) ;
  • Gopalan, A. (Department of Chemistry Graduate School, Kyungpook National University) ;
  • Lee, Kwang-Pill (Department of Chemistry Graduate School, Kyungpook National University)
  • Received : 2007.07.31
  • Accepted : 2007.10.01
  • Published : 2007.10.25

Abstract

Poly(vinylpyrrolidone) stabilized cadmium sulfide (CdS) nanoparticles were loaded onto the surface of silica ($SiO_2$) nanoparticles by using ${\gamma}$-irradiation. TEM micrograph reveals the presence of ~20nm sized CdS nanoparticles on the surface of $SiO_2$ nanoparticles. XRD patterns confirm the crystalline. PL spectra of the simple PVP-stabilized CdS nanoparticle and $SiO_2$@CdS composite confirm the differences in the emission characteristics between them. Two prominent emission peaks were noted around 550 nm and 600 nm for PVP-stabilized CdS nanoparticles). The emission peaks noted for the PVP-stabilized CdS nanoparticles were found to be blue shifted for $SiO_2$@CdS composites. Besides, an additional emission peak around 450 nm was noticed for the $SiO_2$@CdS composite. The presence of CdS nanoparticles influence the emission characteristics and induce quantum confinement effect.

Acknowledgement

Supported by : Hannam University

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