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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

167 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號201307
期刊Physical Review B - Condensed Matter and Materials Physics
71
發行號20
DOIs
出版狀態已發佈 - 2005

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學

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