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Wet-Process Molecular Planting in A Specific Site on Silicon with Si-C Covalent Bonds

Published online by Cambridge University Press:  11 February 2011

Hirokazu Tada ,
Masato Ara  and
Shoji Tanaka
Hirokazu Tada
Affiliation:
Institute for Molecular Science, Okazaki National Research Institutes, Myodaiji, Oakzaki 444–8585, Japan Department of Structural Molecular Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444–8585, Japan
Masato Ara
Affiliation:
Department of Structural Molecular Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444–8585, Japan
Shoji Tanaka
Affiliation:
Institute for Molecular Science, Okazaki National Research Institutes, Myodaiji, Oakzaki 444–8585, Japan Department of Structural Molecular Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki 444–8585, Japan
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Abstract

Alkyl monolayers anchored covalently on silicon were prepared through the reaction between 1-alkenes and hydrogen-terminated silicon (111) surfaces. The 2D-patterning of the surface was done by local oxidation with an atomic force microscope (AFM) and 3D-molecular assemblies were fabricated by immobilization of molecules in a specific site of the patterned surface. The surfaces were anodized with a contact-mode AFM by applying a positive bias voltage to the surface with respect to the platinum-coated cantilever under ambient conditions, which resulted in nanometer-scale oxidation of surfaces. The anodized areas were etched and terminated with hydrogen atoms by NH4F solution, in which we could immobilize various molecules having C=C bonds. We put arylamine molecules to which organic dyes such as fluoroscein were anchored. The intensity of luminescence varied depending on dopant concentration of substrates. Luminescence was very weak on highly-doped silicon possibly due to effective energy transfer from dyes to substrates. The method demonstrated is one of the promising ways to fabricate 3D-assemblies of molecular-scale electronic devices with a stable interface on silicon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 739: Symposium H – Three-Dimensional Nanoengineered Assemblies , 2002 , H7.37
Copyright
Copyright © Materials Research Society 2003

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References

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