Thermal stability of alkoxy monolayers grafted on Si(111)
| Autor: | Philippe Allongue, Jean-Noël Chazalviel, Dorin Dusciac, Catherine Henry de Villeneuve, François Ozanam |
|---|---|
| Přispěvatelé: | Laboratoire de physique de la matière condensée (LPMC), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Hydrosilylation 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Surfaces Coatings and Films Crystallography chemistry.chemical_compound chemistry Desorption Monolayer Materials Chemistry Alkoxy group Organic chemistry Molecule [CHIM]Chemical Sciences Thermal stability 0210 nano-technology Alkyl ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Surface Science Surface Science, Elsevier, 2007, 601 (18), pp.3961-3964. ⟨10.1016/j.susc.2007.04.133⟩ |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2007.04.133⟩ |
| Popis: | Direct grafting of organic monolayers on Si is of prime interest in order to give specific properties to a silicon surface. However, for microelectronics applications, this possibility is hampered by the limited stability of the grafted layers. It has been previously established that alkyl layers attached to Si surfaces through Si–C bonds become unstable at 250–300 °C, by desorption of alkenes. Changing the nature of the bonding to the surface might allow one to circumvent this desorption pathway and increase the layer stability. In our work, decanol and decyl aldehyde are reacted with the Si(1 1 1)–H surface at ∼100 °C during 20 h in order to obtain alkoxy monolayers. FTIR measurements performed in ATR geometry show that the grafted molecule surface coverage is on the order of 33% after reaction with decanol and 50% after reaction with decyl aldehyde. Characterization by AFM essentially reveals that the morphology of the grafted surfaces is unaffected as compared to that of Si–H surfaces. However, the edges of the terraces at alcohol-grafted surfaces exhibit some pitting, probably due to the presence of water in the grafting liquid. Thermal stability studies show that alkoxy chains progressively disappear from the Si surface between 200 and 400 °C. From the CH 2 /CH 3 ratio in the CH region (2760–3070 cm −1 ), it appears that the chains undergo progressive dissociation by C–C bond breaking before their complete disappearance from the surface. Therefore, the thermal behaviour of alkoxy monolayers appears quite distinct from that of alkyl monolayers that tend to leave the surface in a much narrower temperature range (250–350 °C), essentially via breaking of the Si–C bonds. |
| Databáze: | OpenAIRE |
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