TY - JOUR
T1 - Bispyrene Functionalization Drives Self-Assembly of Graphite Nanoplates into Highly Efficient Heat Spreader Foils
AU - Ferraro, Giuseppe
AU - Bernal, M. Mar
AU - Carniato, Fabio
AU - Novara, Chiara
AU - Tortello, Mauro
AU - Ronchetti, Silvia
AU - Giorgis, Fabrizio
AU - Fina, Alberto
N1 - Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.
PY - 2021/4/7
Y1 - 2021/4/7
N2 - Thermally conductive nanopapers fabricated from graphene and related materials are currently showing great potential in thermal management applications. However, thermal contacts between conductive plates represent the bottleneck for thermal conductivity of nanopapers prepared in the absence of a high temperature step for graphitization. In this work, the problem of ineffective thermal contacts is addressed by the use of bifunctional polyaromatic molecules designed to drive self-assembly of graphite nanoplates (GnP) and establish thermal bridges between them. To preserve the high conductivity associated to a defect-free sp2 structure, non-covalent functionalization with bispyrene compounds, synthesized on purpose with variable tethering chain length, was exploited. Pyrene terminal groups granted for a strong π-πinteraction with graphene surface, as demonstrated by UV-Vis, fluorescence, and Raman spectroscopies. Bispyrene molecular junctions between GnP were found to control GnP organization and orientation within the nanopaper, delivering significant enhancement in both in-plane and cross-plane thermal diffusivities. Finally, nanopapers were validated as heat spreader devices for electronic components, evidencing comparable or better thermal dissipation performance than conventional Cu foil, while delivering over 90% weight reduction.
AB - Thermally conductive nanopapers fabricated from graphene and related materials are currently showing great potential in thermal management applications. However, thermal contacts between conductive plates represent the bottleneck for thermal conductivity of nanopapers prepared in the absence of a high temperature step for graphitization. In this work, the problem of ineffective thermal contacts is addressed by the use of bifunctional polyaromatic molecules designed to drive self-assembly of graphite nanoplates (GnP) and establish thermal bridges between them. To preserve the high conductivity associated to a defect-free sp2 structure, non-covalent functionalization with bispyrene compounds, synthesized on purpose with variable tethering chain length, was exploited. Pyrene terminal groups granted for a strong π-πinteraction with graphene surface, as demonstrated by UV-Vis, fluorescence, and Raman spectroscopies. Bispyrene molecular junctions between GnP were found to control GnP organization and orientation within the nanopaper, delivering significant enhancement in both in-plane and cross-plane thermal diffusivities. Finally, nanopapers were validated as heat spreader devices for electronic components, evidencing comparable or better thermal dissipation performance than conventional Cu foil, while delivering over 90% weight reduction.
KW - graphene-related materials
KW - graphite nanoplates self-assembly
KW - heat spreader
KW - molecular junctions
KW - supramolecular functionalization
KW - thermally conductive nanopapers
KW - π-gelators
UR - http://www.scopus.com/inward/record.url?scp=85104047793&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c00319
DO - 10.1021/acsami.1c00319
M3 - Article
SN - 1944-8244
VL - 13
SP - 15509
EP - 15517
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 13
ER -