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    Ligand-Assisted Formation of Graphene/Quantum Dot Monolayers with Improved Morphological and Electrical Properties

    Year: 2020

    Journal: Nanomaterials, Volume 10, APR

    Authors: Litvin, AP; Babaev, AA; Parfenov, PS; Dubavik, A; Cherevkov, SA; Baranov, MA; Bogdanov, KV; Reznik, IA; Ilin, PO; Zhang, XY; Purcell-Milton, F; Gun'ko, YK; Fedorov, AV; Baranov, AV

    Organizations: Russian Science FoundationRussian Science Foundation (RSF) [19-13-00332]; Ministry of Education of the Russian FederationMinistry of Education and Science, Russian Federation [SP-70.2018.1]

    Keywords: quantum dots; graphene; self-assembly; spectroscopy; monolayers; charge transport

    Hybrid nanomaterials based on graphene and PbS quantum dots (QDs) have demonstrated promising applications in optoelectronics. However, the formation of high-quality large-area hybrid films remains technologically challenging. Here, we demonstrate that ligand-assisted self-organization of covalently bonded PbS QDs and reduced graphene oxide (rGO) can be utilized for the formation of highly uniform monolayers. After the post-deposition ligand exchange, these films demonstrated high conductivity and photoresponse. The obtained films demonstrate a remarkable improvement in morphology and charge transport compared to those obtained by the spin-coating method. It is expected that these materials might find a range of applications in photovoltaics and optoelectronics.
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