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hzzhong

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Çë¿´Li JJ and Peng XG 2003 ÎÄÕÂ

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bigbirdw

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ÎÒ²»ÖªµÀÈýÂ¥µÄÈÊÐÖ£¬ÊDz»ÊǰݶÁ¹ý1997ÄêµÄM.G.BawendiµÄÎÄÕ£¬ÎÄÕÂÖÐÌáµ½
The amounts of Zn and S precursors needed to grow a ZnS shell of desired thickness for each CdSe sample were determined as follows: First, the average radius of the CdSe dots was estimated from TEM or SAXS measurements. Next, the ratio of ZnS to CdSe necessary to form a shell of desired thickness was calculated based on the ratio of the shell volume to that of the core assuming a
spherical core and shell and taking into account the bulk lattice parameters of CdSe and ZnS.

[ Last edited by bigbirdw on 2007-7-25 at 11:06 ]
9Â¥2007-07-25 10:51:57
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bigbirdw

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ÕâÓиöʵÀý(JACS,2003,125,12567-12575)£¬ÎÒËãµÄÓëÎÄÏײ»·û£¬Ï£Íû´ó¼ÒÀ´ÌáʾһÏÂ
The amount of cadmium or sulfur precursors required
for each layer was determined by the number of the surface atoms of
a given size of a core/shell nanocrystal. Because there is only about
5-6% lattice mismatch between CdSe and CdS bulk crystals, the
calculations were based on the wurtzite structure of CdSe nanocrystals.
The average thickness of one monolayer of CdS was taken as 0.35
nm, so one additional layer growth would increase the diameter of a
nanocrystal by 0.7 nm. For example, in a typical experiment with 1 *10-5 mmol of 3.7 nm core, 2.13*10-3 mmol of Cd and S precursors
is needed for the first layer of the shell growth,
10Â¥2007-07-25 11:22:20
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