Size-dependent properties of CdSe quantum dots

S. Neeleshwar, C. L. Chen, C. B. Tsai, Y. Y. Chen, C. C. Chen, S. G. Shyu, M. S. Seehra

Research output: Contribution to journalArticlepeer-review

137 Citations (Scopus)

Abstract

Temperature dependences of the magnetic susceptibility χ and heat capacity Cp of CdSe quantum dots with size d=2.8, 4.1, and 5.6 nm are compared to those of bulk CdSe to determine the size-dependent effects. With decreasing size d, the following effects are observed: (i) room temperature optical absorption shows a blueshift of the band gap; (ii) room temperature x-ray diffraction show wurtzite structure but with smaller lattice constants; (iii) magnetic susceptibility changes from negative (diamagnetic) for the bulk to positive χ with magnitude increasing with decreasing d; and (iv) the Sommerfeld constant γ determined from the Cp T vs T2 data increases. Possible explanations for these size-dependent properties are presented.

Original languageEnglish
Article number201307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number20
DOIs
Publication statusPublished - 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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