Hydrogen-terminated porous silicon preparation

Fig. 1 Comparison of the magnetization curves of bare n silicon (full line), as-etched porous silicon prepared from the same wafer (dotted line), and aged porous silicon offering a native oxide layer (dashed line). All three samples show a diamagnetic behavior, whereas the estimated susceptibility varies between —1.2 10 (Si), —7.5 10 (as-etched), and —2.6 10 (aged). The measurements have been performed at T = 4.2 K. The diamagnetic behavior of porous silicon decreases if the sample is oxidized (in contrast to hydrogen terminated) which might be caused by the occurrence of dangling bonds...

Linford MR, Fenter P, Eisenberger PM, Chidsey CED (1995) Alkyl monolayers on silicon prepared from 1-alkenes and hydrogen-terminated silicon. J Am Chem Soc 117 3145-3155 Liu YM, Chen BL, Cao F, Chan HLW, Zhao XZ, Yuan JK (2011) One-pot synthesis of three-dimensional silver-embedded porous silicon micronparticles for lithium-ion batteries. J Mater Chem 21 17083-17086... 

Although silicon nanocrystals are now more commonly prepared by a variety of means which are easier to scale up, e.g., pyrolysis of silanes (Xuegeng et al. 2004), thermal treatment of silsesquioxanes (Hessel et al. 2006, 2010), and from reactions of molecular silicon compounds (Wilcoxon et al. 1999 Bley and Kauzlarich 1996), this review will concentrate on routes which proceed via the formation of porous silicon. More general reviews of silicon nanocrystals Irom physics and chemistry perspectives are available (Shirahata 2011 Kang et al. 2011 Heitmann et al. 2005). Derivatization of porous silicon and SiNCs usually relies on the chemistry of the hydrogen-terminated silicon surface, which shares some of the organic reactivity of hydrosilanes (Buriak 2002). Reaction with alcohols results in Si-O-C bonded monolayers (Sweryda-Krawiec et al. 1999), but these are suseeptible to hydrolysis under ambient conditions. Alternately, addition of surface Si-H aeross a C = C double bond produces Si-C bonded monolayers, which are very stable. 

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