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- W1982138354 abstract "We report on the stability of space charges within nanoscale silicon oxide patterns generated by atomic force microscope tip-induced local anodic oxidation of alkyl-terminated silicon. Surface potentials of these structures are investigated using two different approaches: Kelvin probe force microscopy and the spectroscopy of adsorbed charge-sensitive dye molecules. Both techniques prove that there is no decay of the space charge itself at least for several days. The apparent decrease of the surface potential measured with the Kelvin probe method is known to be influenced by the ambient humidity. It is supposed to be caused by a screening effect through the formation of a water layer. This is confirmed by our investigation of the surface potential decrease kinetics, which could be well fitted with an adapted model of water condensation. The fluorescence of the charge-sensitive dye di-4-ANEPPS, which is applied to the structures, shows a spectral shift of about 270 meV compared to an uncharged silicon oxide surface. The high stability of the charges supports the use of local anodic oxidation patterns as templates for selective immobilization of cationic species." @default.
- W1982138354 created "2016-06-24" @default.
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- W1982138354 date "2012-02-10" @default.
- W1982138354 modified "2023-09-27" @default.
- W1982138354 title "Detection and stability of nanoscale space charges in local oxidation nanolithography" @default.
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- W1982138354 doi "https://doi.org/10.1088/0957-4484/23/9/095707" @default.
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