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• W2328590884 abstract "Surface functionalization of an inorganic surface with bio-organic molecules is often aimed at creating a permanent bio-organic surface with receptor functional groups. We show here that L-cysteine can be used to transform a highly reactive Si(111)7×7 surface to not just a permanent bio-organic surface but also a semipermanent (or renewable) and a temporary bio-organic surfaces by manipulating the exposure. In the early growth stage, the strong bonding between the first cysteine adlayer and the Si substrate through Si-N or Si-S linkages in unidentate or bidentate arrangement provides permanent biofunctionalization by this interfacial layer. This interfacial layer can be used to build a transitional layer (second adlayer) mediated by interlayer vertical hydrogen bonding between an amino group and a carboxylic acid group. Further exposure of cysteine eventually leads to a zwitterionic multilayer film involving electrostatic interactions between cation (-NH3(+)) and anion moieties (-COO(-)). The interlayer hydrogen bonding therefore provides temporary trapping of bio-organic molecules as the second transitional layer that is stable up to 175 °C. This transitional layer can be easily removed by annealing above this temperature and then regenerated with the same molecular layer or a different one by renewing the interlayer hydrogen bonds. We also illustrate coverage-dependent adsorption structures of cysteine, from bidentate to unidentate attachments and to self-assembled multimers, involving formation of intralayer horizontal N···H-O hydrogen bonds, by combining our X-ray photoemission data with the local density-of-state images obtained by scanning tunnelling microscopy." @default.
• W2328590884 created "2016-06-24" @default.
• W2328590884 creator A5011340744 @default.
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• W2328590884 date "2014-11-18" @default.
• W2328590884 modified "2023-09-27" @default.
• W2328590884 title "Biofunctionalization of Si(111)7×7 by “Renewable” <scp>l</scp>-Cysteine Transitional Layer" @default.
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• W2328590884 doi "https://doi.org/10.1021/ja509264t" @default.
• W2328590884 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25375417" @default.
• W2328590884 hasPublicationYear "2014" @default.
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