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Multiscale Charge T...
Multiscale Charge Transport in van der Waals Thin Films: Reduced Graphene Oxide as a Case Study
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- Kovtun, Alessandro (author)
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR),Institute for organic syntheses and photoreactivity (ISOF-CNR)
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- Candini, Andrea (author)
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR),Institute for organic syntheses and photoreactivity (ISOF-CNR)
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Vianelli, Anna (author)
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- Boschi, Alex (author)
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR),Institute for organic syntheses and photoreactivity (ISOF-CNR)
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Dell'Elce, Simone (author)
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- Gobbi, Marco (author)
- Centro de Investigacion Cooperativa en Nanociencias,Basque Foundation for Science (Ikerbasque),Université de Strasbourg,University of Strasbourg
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- Kim, Kyung Ho, 1984 (author)
- Royal Holloway University of London,Chalmers tekniska högskola,Chalmers University of Technology
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- Lara Avila, Samuel, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Samorì, Paolo (author)
- Université de Strasbourg,University of Strasbourg
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Affronte, Marco (author)
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- Liscio, A. (author)
- Consiglo Nazionale Delle Richerche
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- Palermo, Vincenzo, 1972 (author)
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR),Institute for organic syntheses and photoreactivity (ISOF-CNR),Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2021-01-19
- 2021
- English.
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In: ACS Nano. - : American Chemical Society (ACS). - 1936-086X .- 1936-0851. ; 15:2, s. 2654-2667
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Abstract
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- Large area van der Waals (vdW) thin films are assembled materials consisting of a network of randomly stacked nanosheets. The multiscale structure and the two-dimensional (2D) nature of the building block mean that interfaces naturally play a crucial role in the charge transport of such thin films. While single or few stacked nanosheets (i.e., vdW heterostructures) have been the subject of intensive works, little is known about how charges travel through multilayered, more disordered networks. Here, we report a comprehensive study of a prototypical system given by networks of randomly stacked reduced graphene oxide 2D nanosheets, whose chemical and geometrical properties can be controlled independently, permitting to explore percolated networks ranging from a single nanosheet to some billions with room-temperature resistivity spanning from 10-5 to 10-1 ω·m. We systematically observe a clear transition between two different regimes at a critical temperature T*: Efros-Shklovskii variable-range hopping (ES-VRH) below T∗ and power law behavior above. First, we demonstrate that the two regimes are strongly correlated with each other, both depending on the charge localization length ζ, calculated by the ES-VRH model, which corresponds to the characteristic size of overlapping sp2 domains belonging to different nanosheets. Thus, we propose a microscopic model describing the charge transport as a geometrical phase transition, given by the metal-insulator transition associated with the percolation of quasi-one-dimensional nanofillers with length ζ, showing that the charge transport behavior of the networks is valid for all geometries and defects of the nanosheets, ultimately suggesting a generalized description on vdW and disordered thin films.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- van der Waals thin films
- charge transport
- disorder
- graphene-based materials
- percolation
- composite materials
- conductive polymers
Publication and Content Type
- art (subject category)
- ref (subject category)
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ACS Nano
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Kovtun, Alessand ...
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Candini, Andrea
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Vianelli, Anna
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Boschi, Alex
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Dell'Elce, Simon ...
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Gobbi, Marco
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Kim, Kyung Ho, 1 ...
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Lara Avila, Samu ...
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Samorì, Paolo
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Affronte, Marco
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Liscio, A.
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Palermo, Vincenz ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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ACS Nano
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Chalmers University of Technology