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 journalArticle

130 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 Dec 15

    Fingerprint

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Neeleshwar, S., Chen, C. L., Tsai, C. B., Chen, Y. Y., Chen, C. C., Shyu, S. G., & Seehra, M. S. (2005). Size-dependent properties of CdSe quantum dots. Physical Review B - Condensed Matter and Materials Physics, 71(20), [201307]. https://doi.org/10.1103/PhysRevB.71.201307