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

127 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

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Semiconductor quantum dots
quantum dots
Magnetic susceptibility
magnetic permeability
Temperature
Light absorption
Lattice constants
Specific heat
Energy gap
room temperature
Diffraction
wurtzite
X rays
optical absorption
x ray diffraction
specific heat
temperature dependence

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

Size-dependent properties of CdSe quantum dots. / Neeleshwar, S.; Chen, C. L.; Tsai, C. B.; Chen, Y. Y.; Chen, C. C.; Shyu, S. G.; Seehra, M. S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 20, 201307, 15.12.2005.

Research output: Contribution to journalArticle

Neeleshwar, S, Chen, CL, Tsai, CB, Chen, YY, Chen, CC, Shyu, SG & Seehra, MS 2005, 'Size-dependent properties of CdSe quantum dots', Physical Review B - Condensed Matter and Materials Physics, vol. 71, no. 20, 201307. https://doi.org/10.1103/PhysRevB.71.201307
Neeleshwar, S. ; Chen, C. L. ; Tsai, C. B. ; Chen, Y. Y. ; Chen, C. C. ; Shyu, S. G. ; Seehra, M. S. / Size-dependent properties of CdSe quantum dots. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 20.
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