Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils
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 l...
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MDPI AG
2021-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/3/565 |
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| author | Carlo Barone Monica Bertoldo Raffaella Capelli Franco Dinelli Piera Maccagnani Nadia Martucciello Costantino Mauro Sergio Pagano |
| author_facet | Carlo Barone Monica Bertoldo Raffaella Capelli Franco Dinelli Piera Maccagnani Nadia Martucciello Costantino Mauro Sergio Pagano |
| author_sort | Carlo Barone |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T00:34:03Z |
| format | Article |
| id | doaj.art-e927003a234240faaedcc5dfecc97f14 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T00:34:03Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e927003a234240faaedcc5dfecc97f142023-12-11T18:18:20ZengMDPI AGNanomaterials2079-49912021-02-0111356510.3390/nano11030565Electric Transport in Gold-Covered Sodium–Alginate Free-Standing FoilsCarlo Barone0Monica Bertoldo1Raffaella Capelli2Franco Dinelli3Piera Maccagnani4Nadia Martucciello5Costantino Mauro6Sergio Pagano7Dipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084 Fisciano, ItalyDipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie, Università degli Studi di Ferrara, Via L. Borsari 46, I-44121 Ferrara, ItalyDipartimento di Ingegneria E. Ferrari, Università di Modena e Reggio Emilia, I-41125 Modena, ItalyCNR—Istituto Nazionale di Ottica, Via G. Moruzzi 1, I-56124 Pisa, ItalyCNR—Istituto per la Microelettronica e Microsistemi, Via P. Gobetti 101, I-40129 Bologna, ItalyCNR—SPIN Salerno, c/o Università degli Studi di Salerno, I-84084 Fisciano, ItalyDipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084 Fisciano, ItalyDipartimento di Fisica “E.R. Caianiello”, Università degli Studi di Salerno, I-84084 Fisciano, ItalyThe 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.https://www.mdpi.com/2079-4991/11/3/565biopolymerselectric transport measurementsgold thin films |
| spellingShingle | Carlo Barone Monica Bertoldo Raffaella Capelli Franco Dinelli Piera Maccagnani Nadia Martucciello Costantino Mauro Sergio Pagano Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils Nanomaterials biopolymers electric transport measurements gold thin films |
| title | Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils |
| title_full | Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils |
| title_fullStr | Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils |
| title_full_unstemmed | Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils |
| title_short | Electric Transport in Gold-Covered Sodium–Alginate Free-Standing Foils |
| title_sort | electric transport in gold covered sodium alginate free standing foils |
| topic | biopolymers electric transport measurements gold thin films |
| url | https://www.mdpi.com/2079-4991/11/3/565 |
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