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Vibration Dynamics of Supra‐Crystals of Cobalt Nanocrystals Studied With Femtosecond Laser Pulses
Author(s) -
Lisiecki Isabelle,
Halté Valérie,
Petit Christophe,
Pileni MariePaule,
Bigot JeanYves
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200800832
Subject(s) - materials science , mesoscopic physics , femtosecond , nanocrystal , superstructure , cobalt , laser , vibration , self assembly , nanotechnology , chemical physics , optics , condensed matter physics , oceanography , physics , quantum mechanics , geology , metallurgy
Face‐centered cubic (fcc) Supra‐crystals and disordered assemblies of Co nanocrystals have their time‐dependent reflectivity compared using time‐resolved confocal microscopy. The differential reflectivity exhibits a behavior strongly dependent on mesoscopic organization, an effect associated with the collective coherent vibration of the cobalt nanocrystals in the fcc superstructure. The coherent vibration is mediated by interdigitated aliphatic chains acting as nanosprings.