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【答案】应助回帖
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超级老快: 金币+90, 翻译EPI+1, ★★★很有帮助 2016-11-30 16:21:33
1.Au-Ag ???????????????Ч??????????????????????????????????????????????????????????????????????????????????糡????????? Au-Ag ????????????????????á????????????????д??????????????????????????????????????????????????????????????????á??? Au-Ag ???????????????????????????????????????????????????????????????γ???????????????????????????????????
Compared to Au or Ag nanopartilces, Au-Ag alloyed nanostructures is probably more practical choice as a modifier (????modifier?????????????????) to achieve more efficient, reproducible and stable upper-conversion luminescent. Secondary, although pure Ag has a large extinction cross section and good surface plasmon properties, its chemical and structural instability limits its wide uses. On the other hand, Au-Ag alloyed nanostructures possess the advantages of superior stability of gold and large extinction cross section that Ag has. Thirdly, These heterogeneous structure can help contract island-linke structure and prevent aggregation among particles, therefore increases the ratio between scatter and absorption.
2.????????????????????????Ч?????????????????????????????Ч?????????????糡???????????????????漸?????λ?á?
Generally speaking, the field enhancement effect on metal surface decreases exponentially as the distance increases, the most efficient distance or the greatest field enhancement occurs a few nms from the surface. |
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