Evaporation and deposition of alkyl-capped silicon nanocrystals in ultrahigh vacuum

被引:62
作者
Chao, Yimin
Siller, Lidija
Krishnamurthy, Satheesh
Coxon, Paul R.
Bangert, Ursel
Gass, Mhairi
Kjeldgaard, Lisbeth
PatoleO, Samson N.
Lie, Lars H.
O'Farrell, Norah
Alsop, Thomas A.
Houlton, Andrew
Horrocks, Benjamin R.
机构
[1] Newcastle Univ, Sch Nat Sci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[2] Newcastle Univ, Sch Chem Engn & Adv Mat, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] Univ Manchester, Ctr Mat Sci, Manchester M1 7HS, Lancs, England
[4] Daresbury Lab, Super STEM, Warrington WA4 4AD, Cheshire, England
[5] Lund Univ, MAXLAB, S-22100 Lund, Sweden
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1038/nnano.2007.224
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nanocrystals are under active investigation because of their interesting size- dependent properties(1,2) and potential applications(3-5). Silicon nanocrystals have been studied for possible uses in optoelectronics(6), and may be relevant to the understanding of natural processes such as lightning strikes(7). Gas-phase methods can be used to prepare nanocrystals, and mass spectrometric techniques have been used to analyse Au-8,(9) and CdSe clusters(10). However, it is difficult to study nanocrystals by such methods unless they are synthesized in the gas phase(11). In particular, pre-prepared nanocrystals are generally difficult to sublime without decomposition. Here we report the observation that films of alkyl-capped silicon nanocrystals evaporate upon heating in ultrahigh vacuum at 200 degrees C, and the vapour of intact nanocrystals can be collected on a variety of solid substrates. This effect may be useful for the controlled preparation of new quantum-confined silicon structures and could facilitate their mass spectroscopic study and size- selection(12).
引用
收藏
页码:486 / 489
页数:4
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