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Nanoscopic Photoluminescence Memory as a Fingerprint of Complexity in Self-Assembled Alkyl/Siloxane Hybrids

Authors


  • The support of NoE FAME and Fundação para a Ciência e Tecnologia (FCT; POCTI/P/CTM/46780/02 and POCI/CTM/59075/04) is gratefully acknowledged. The authors thank A. L. L. Videira for fruitful discussions and a critical revision of the manuscript. The collaboration of H. D. Burrows in the discussion of the thermodynamics of monoamidosil self-assembly, S. S. Nobre in the photoluminescence detection, J. Cybinska in the quantum-yield measurements, and K. Dahmouche and LNLS staff during SAXS measurements is gratefully acknowledged. S. C. N. and N. J. O. S. thank the FCT for grants SFRH/BD/13559/03 and SFRH/BD/10383/02, respectively.

Abstract

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A thermally activated photoluminescence memory effect, induced by a reversible order–disorder phase transition of the alkyl chains, is reported for highly organized bilayer alkyl/siloxane hybrids (see figure; left at room temperature, right at 120 °C). The emission energy is sensitive to the annihilation/formation of the hydrogen-bonded amide–amide array displaying a unique nanoscopic sensitivity (ca. 150 nm).

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