Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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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
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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.

방사선 방법에 의해 실리카 나노입자에 CdS 나노입자를 코팅하였다. TEM분석결과, $SiO_2$ 나노입자 표면에 CdS의 입자의 크기는 대략 20 nm임을 확인 하였다. 또한, XRD 분석결과 결정체 화합물임을 확인하였다. PL 분석결과 PVP-CdS 나노입자와 $SiO_2$@CdS 복합체의 경우, 방출특성이 상당히 다르다는 것이 확인되었다. PVP-CdS의 경우, 방출스펙트럼이 550 nm-600 nm 에서 나타나고, $SiO_2$@CdS의 방출스펙트럼의 경우 단파장 이동함을 확인하였다. 또한 새로운 피이크 (450 nm) 나타남을 확인하였는데, 이는 CdS 의 유발양자 제한 효과에 의한 것으로 사료된다.

Keywords

References

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