Formation of the methyl- and n-butyl monolayer on (Cl)-Si(111) surfaces by using the Grignard reaction and their electrochemical behavior was investigated. The modified Si(111) surfaces were indicated to be closely packed with a single moiety species. The methyl-modified Si(111) surface was composed of (1 x 1) adlattice structure. The methyl-modified surface was stable in aqueous solution, and showed essentially good electrical conductive property with p-n junction like behavior.
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