國立臺灣師範大學化學系S. NeeleshwarC.-L. ChenC.-B. TsaiY.-Y. ChenChia-Chun ChenS.-G. ShyuM.-S. Seehra2014-12-022014-12-022005-05-231098-0121http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/42316Temperature 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.