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Position:Home > News > Technical Data > the average metal particle size had only
the average metal particle size had only
Source:    Published:2011/6/10 11:26:16

   charged ratio (1.33:1) in the preparation, proving the formation of bimetallic nanoclusters. In the chemical preparation of unprotected metal colloids, the metal concentration usually has a significant influence on the particle size of obtained metal nanoclus-

   ters. For example, when increasing Pd concentration from 0.1 t0 1.0 mM in the preparation of Pd metal colloids by the thermal decomposition of Pd acetate in methyl isobutyl ketone, the average Pd particle size increased from 8 to一140 nm [6,7]. However, in the alkaline EG synthesis method, the size of metal nanoclusters was only slightly dependent on the metal concentration of the colloidal solution. The colloidal Pt particles prepared with a metal concentration of 3.7g/l had an average diameter of 1.3 nm, which was only 0.2 nm larger than that of the Pt particles prepared with a metal concentration of 0.37 g/l. In the case of Os nanoclusters, when the metal concentration in a colloidal solution was elevated from 3.7 to

  

   7.4g/l, the average metal particle size had only a slight increase from 0.9 t0 1.0 nm. These results suggest that the alkaline EG synthesis method is very effective for preparing unprotected metal nanoclusters having small particle size and narrow size distribution.

   Different from the metal concentration, the content of water in the reaction system exhibits an obvious effect on the particle size of the resulted metal nanoclusters. In a mixture of EG and water (10:1 in volume ratio), Pt hydroxide colloidal particles formed in the first synthesis

   step were 4.0 nm in average diameter, and the finally obtained Pt nanoclusters had an average particle size of nm, which was much larger than that of the Pt nanoclusters prepared in pure EG with the same metal concentration

CAS NO.189278-27-1
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