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Cellulose-inorganic hybrids of strongly reduced thermal conductivity

Panagiotis Spiliopoulos, Marie Gestranius, Chao Zhang, Ramin Ghiyasi, John Tomko, Kai Arstila, Matti Putkonen, Patrick E. Hopkins, Maarit Karppinen, Tekla Tammelin, Eero Kontturi

Abstract: The employment of atomic layer deposition and spin coating techniques for preparing inorganic–organic hybrid multilayer structures of alternating ZnO-CNC layers was explored in this study. Helium ion microscopy and X-ray reflectivity showed the superlattice formation for the nanolaminate structures and atomic force microscopy established the efficient control of the CNCs surface coverage on the Al-doped ZnO by manipulating the concentration of the spin coating solution. Thickness characterization of the hybrid structures was performed via both ellipsometry and X-ray reflectivity and the thermal conductivity was examined by time domain thermoreflectance technique. It appears that even the incorporation of a limited amount of CNCs between the ZnO laminates strongly suppresses the thermal conductivity. Even small, submonolayer amounts of CNCs worked as a more efficient insulating material than hydroquinone or cellulose nanofibers which have been employed in previous studies.

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