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Size-dependent properties of CdSe quantum dots

S. Neeleshwar, C. L. Chen, C. B. Tsai, Y. Y. Chen, C. C. Chen, S. G. Shyu, and M. S. Seehra
Phys. Rev. B 71, 201307(R) – Published 23 May 2005

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 CpT vs T2 data increases. Possible explanations for these size-dependent properties are presented.

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  • Received 16 March 2005

DOI:https://doi.org/10.1103/PhysRevB.71.201307

©2005 American Physical Society

Authors & Affiliations

S. Neeleshwar, C. L. Chen, C. B. Tsai, and Y. Y. Chen*

  • Institute of Physics, Academia Sinica, Taipei, Taiwan, Republic of China

C. C. Chen

  • Department of Chemistry, National Taiwan Normal University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, Republic of China

S. G. Shyu

  • Institute of Chemistry, Academia Sinica, Taipei, Taiwan, Republic of China

M. S. Seehra

  • Physics Department, West Virginia University, Morgantown, West Virginia 26506, USA

  • *Electronic address: cheny2@phys.sinica.edu.tw

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Issue

Vol. 71, Iss. 20 — 15 May 2005

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