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Title: Size Dependent Properties of CdSe Quantum Dots
Authors: 國立臺灣師範大學化學系
S. Neeleshwar
C.-L. Chen
C.-B. Tsai
Y.-Y. Chen
Chia-Chun Chen
S.-G. Shyu
M.-S. Seehra
Issue Date: 23-May-2005
Publisher: American Physical Society
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.
ISSN: 1098-0121
Other Identifiers: ntnulib_tp_C0301_01_032
Appears in Collections:教師著作

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