Molecular Self-Assembly of Dihydroxy-Terminated Molecules via Acid−Base Hydrolytic Chemistry on Silica Surfaces: Step-by-Step Multilayered Thin Film Construction
| Autor: | Ashok K. Kakkar, Chi Ming Yam |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Silicon
Chemistry Stereochemistry technology industry and agriculture chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Contact angle Carbon film Polymerization Chemical engineering Ellipsometry Monolayer Electrochemistry Molecular self-assembly General Materials Science Thin film Spectroscopy |
| Zdroj: | Langmuir. 15:3807-3815 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la9816961 |
| Popis: | Acid−base hydrolytic chemistry of aminosilanes with dihydroxy-terminated molecules containing rigid-rod type and alkyldiacetylene backbones, has been used to construct thin films on Si(100) (Si/SiO2) substrates. A layer-by-layer construction methodology using Si(NEt2)4 and 2,4-hexadiyne-1,6-diol or 5,7-dodecadiyne-1,12-diol leads to multilayered supramolecular structures. The quality of thin films in this step-by-step deposition process was monitored by contact angle goniometry, ellipsometry, Fourier transform infrared−attenuated total reflection, X-ray photoelectron, and UV−vis absorption spectroscopies. The results indicate that diol-terminated chromophores form good quality, relatively closely packed thin films on silicon(silica) surfaces. Multilayered thin film construction enhances the stability of the thin films under varied conditions. The thin film assemblies were subjected to topochemical polymerization, and upon UV−vis exposure, the formation of a blue film was observed. |
| Databáze: | OpenAIRE |
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