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Issue 23, 2016
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Length-dependent thermal transport in one-dimensional self-assembly of planar π-conjugated molecules

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Abstract

This work reports a thermal transport study in quasi-one-dimensional organic nanostructures self-assembled from conjugated planar molecules via π–π interactions. Thermal resistances of single crystalline copper phthalocyanine (CuPc) and perylenetetracarboxylic diimide (PTCDI) nanoribbons are measured via a suspended thermal bridge method. We experimentally observed the deviation from the linear length dependence for the thermal resistance of single crystalline β-phase CuPc nanoribbons, indicating possible subdiffusion thermal transport. Interestingly, a gradual transition to the linear length dependence is observed with the increase of the lateral dimensions of CuPc nanoribbons. The measured thermal resistance of single crystalline CuPc nanoribbons shows an increasing trend with temperature. However, the trend of temperature dependence of thermal resistance is reversed after electron irradiation, i.e., decreasing with temperature, indicating that the single crystalline CuPc nanoribbons become ‘amorphous’. Similar behavior is also observed for PTCDI nanoribbons after electron irradiation, proving that the electron beam can induce amorphization of single crystalline self-assembled nanostructures of planar π-conjugated molecules. The measured thermal resistance of the ‘amorphous’ CuPc nanoribbon demonstrates a roughly linear dependence on the nanoribbon length, suggesting that normal diffusion dominates thermal transport.

Graphical abstract: Length-dependent thermal transport in one-dimensional self-assembly of planar π-conjugated molecules

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Publication details

The article was received on 20 Dec 2015, accepted on 16 May 2016 and first published on 17 May 2016


Article type: Paper
DOI: 10.1039/C5NR09043A
Citation: Nanoscale, 2016,8, 11932-11939
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    Length-dependent thermal transport in one-dimensional self-assembly of planar π-conjugated molecules

    H. Tang, Y. Xiong, F. Zu, Y. Zhao, X. Wang, Q. Fu, J. Jie, J. Yang and D. Xu, Nanoscale, 2016, 8, 11932
    DOI: 10.1039/C5NR09043A

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