Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 30, Pages 10068-10071Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp904196h
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- FINEP (Brazil)
- CAPES
- CNPq (Brazil)
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The molecular arrangement in organic thin films is crucial for their increasing technological applications. Here, we use vibrational spectroscopy by sum-frequency generation (SFG) to study the ordering of polyelectrolyte layers adsorbed on silica for all steps of layer-by-layer (LbL) self-assembly. In situ measurements during adsorption and rinsing showed that the adsorbed polymer has a disordered conformation and confirmed surface charge overcompensation upon polyelectrolyte adsorption by probing the interfacial electric field. In dry films, the polymer chains acquired a net orientational ordering, which was affected, however, by the adsorption of subsequent layers. Such a detailed characterization may allow the control of LbL film structure and functionality with unprecedented power.
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