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Article

Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils

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Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084 Fisciano, Italy
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CNR—SPIN Salerno, c/o Università degli Studi di Salerno, I-84084 Fisciano, Italy
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INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, I-84084 Fisciano, Italy
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Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie, Università degli Studi di Ferrara, Via L. Borsari 46, I-44121 Ferrara, Italy
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Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, I-40129 Bologna, Italy
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Dipartimento di Ingegneria E. Ferrari, Università di Modena e Reggio Emilia, I-41125 Modena, Italy
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CNR—Istituto Officina dei Materiali, S.S. 14, km 163.5 in Area Science Park, I-34012 Trieste, Italy
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Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
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CNR—Istituto Nazionale di Ottica, Via G. Moruzzi 1, I-56124 Pisa, Italy
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CNR—Istituto per la Microelettronica e Microsistemi, Via P. Gobetti 101, I-40129 Bologna, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Mircea Dragoman
Nanomaterials 2021, 11(3), 565; https://doi.org/10.3390/nano11030565
Received: 8 February 2021 / Revised: 20 February 2021 / Accepted: 21 February 2021 / Published: 24 February 2021
(This article belongs to the Special Issue 2D Materials for Nanoelectronics)
The electric transport properties of flexible and transparent conducting bilayers, realized by sputtering ultrathin gold nanometric layers on sodium–alginate free-standing films, were studied. The reported results cover a range of temperatures from 3 to 300 K. In the case of gold layer thicknesses larger than 5 nm, a typical metallic behavior was observed. Conversely, for a gold thickness of 4.5 nm, an unusual resistance temperature dependence was found. The dominant transport mechanism below 70 K was identified as a fluctuation-induced tunneling process. This indicates that the conductive region is not continuous but is formed by gold clusters embedded in the polymeric matrix. Above 70 K, instead, the data can be interpreted using a phenomenological model, which assumes an anomalous expansion of the conductive region upon decreasing the temperature, in the range from 300 to 200 K. The approach herein adopted, complemented with other characterizations, can provide useful information for the development of innovative and green optoelectronics. View Full-Text
Keywords: biopolymers; electric transport measurements; gold thin films biopolymers; electric transport measurements; gold thin films
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MDPI and ACS Style

Barone, C.; Bertoldo, M.; Capelli, R.; Dinelli, F.; Maccagnani, P.; Martucciello, N.; Mauro, C.; Pagano, S. Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils. Nanomaterials 2021, 11, 565. https://doi.org/10.3390/nano11030565

AMA Style

Barone C, Bertoldo M, Capelli R, Dinelli F, Maccagnani P, Martucciello N, Mauro C, Pagano S. Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils. Nanomaterials. 2021; 11(3):565. https://doi.org/10.3390/nano11030565

Chicago/Turabian Style

Barone, Carlo, Monica Bertoldo, Raffaella Capelli, Franco Dinelli, Piera Maccagnani, Nadia Martucciello, Costantino Mauro, and Sergio Pagano. 2021. "Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils" Nanomaterials 11, no. 3: 565. https://doi.org/10.3390/nano11030565

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