BERNAL ORTEGA, MARIA DEL MAR

DI PIERRO, Alessandro

Eleuteri, Matteo

Ferraro, Giuseppe

Fina, Alberto

English

Maria Del Mar Bernal

Giuseppe Ferraro

ELEUTERI, MATTEO

Alessandro Di Pierro

Alberto Fina

PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino)

04 August 2020POLITECNICO DI TORINORepository ISTITUZIONALEMolecular Junctions between Graphene Nanoplatelets to Enhance Heat Transfer in Nanomaterials / BERNAL ORTEGA,MARIA DEL MAR; Ferraro, Giuseppe; Eleuteri, Matteo; DI PIERRO, Alessandro; Fina, Alberto. - ELETTRONICO. -(2018). ((Intervento presentato al convegno Graphene2018 tenutosi a Dresden (Germany) nel 26-29 June 2018.OriginalMolecular Junctions between Graphene Nanoplatelets to Enhance Heat Transfer in NanomaterialsPublisher:PublishedDOI:Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2715095 since: 2018-10-15T15:48:23ZPhantoms FoundationGraphene2018                                                   June 26-29, 2018 Dresden (Germany) Molecular Junctions between Graphene Nanoplatelets to Enhance Heat Transfer in Nanomaterials   M.Mar Bernal Giuseppe Ferraro Matteo Eleuteri Alessandro Di Pierro Alberto Fina  Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, 15121, Alessandria, Italy  maria.bernal@polito.it   The fast-growing development of modern technologies made efficient heat dissipation extremely important to the performance, lifetime and reliability of electronic and optoelectronic devices. In this context, freestanding graphene nanopapers have emerged as promising materials to address heat dissipation problems in practical applications.[1] However, the thermal conductivity of such networks is strongly limited by the inefficiency of the contacts between graphene sheets. The aim of this study is to design and synthesize molecular junctions between graphene nanoplatelets (GnP) to create graphene nanopapers with inherently low contact thermal resistance among nanoparticles. Molecular dynamics was used to screen for candidate molecules to enhance conductance at the particle-particle contacts, including chain length and bonding method. Covalent and non-covalent synthetic approaches were exploited to engineer contact resistance in graphene networks. Covalent functionalization was recently demonstrated to enhance both in-plane and cross-plane thermal conductivity of GNP networks. (Figure 1).[2] Non-covalent functionalization, by the use of bispyrene derivatives to build supramolecular junctions between nanoplatelets, was also observed to strongly influence the heat transfer on the network, also depending on the chain length of the alkyl spacer between pyrene groups (Figure 2).  References [1] Balandin, A.A., Nat. Mater, 10 (2011) 569  [2] Bernal, M.M.; Di Pierro, A.; Novara, C.; Giorgis, F.; Mortazavi, B.; Saracco, G.; Fina, A., Adv. Funct. Mat., (2018) 1706954  Figures  Figure 1: In-plane and cross-plane thermal conductivities of GnP and functionalized GNP with supramolecular and covalent junctions.  Figure 2: In-plane and cross-plane thermal conductivities of GnP and functionalized GNP with bispyrene derivatives (GnP-bPyx).  

Molecular Junctions between Graphene Nanoplatelets to Enhance Heat Transfer in Nanomaterials

https://iris.polito.it/retrieve/handle/11583/2715095/211675/Grapheneconf2018_Bernal_M.Mar.pdf

Molecular Junctions between Graphene Nanoplatelets to Enhance Heat Transfer in Nanomaterials

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