Reaction of photoluminescent porous silicon surfaces with lithium reagents to form silicon-carbon bound surface species

被引:38
作者
Song, JH [1 ]
Sailor, MJ [1 ]
机构
[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
关键词
D O I
10.1021/ic980303i
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Exposure of photoluminescent porous Si to alkyllithium reagents results in grafting of the alkyl group to the silicon surface by formation of a Si-C bond. The reaction is proposed to proceed by addition of the alkyllithium reagent across a surface Si-Si bond, forming Si-alkyl and Si-Li surface species. The highly reactive Si-Li surface group is readily hydrolyzed by water, resulting in significant surface oxidation. The surface-bound Li can also be replaced with acyl or methyl groups by addition of acetyl chloride, heptanoyl chloride, 4-butylbenzoyl chloride, 3-(chloromethyl)benzoyl chloride, 3-chloropropionyl chloride, or methyl trifluoromethanesulfonate. The acylation or alkylation steps preclude surface oxidation. In all cases, the intensity of photoluminescence from the porous Si samples is reduced after functionalization.
引用
收藏
页码:1498 / 1503
页数:6
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