Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination
There is an urgent need for the development of elastic dielectric materials for flexible organic field effect transistors (OFETs). In this work, detailed analysis of the AC and DC electrical conductivity of a series of flexible poly(dimethylsiloxane) (PDMS) polymers crosslinked by metal-ligand coord...
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MDPI AG
2021-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/6/956 |
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| author | Angelika Wrzesińska Aleksandra Wypych-Puszkarz Izabela Bobowska Jacek Ulański |
| author_facet | Angelika Wrzesińska Aleksandra Wypych-Puszkarz Izabela Bobowska Jacek Ulański |
| author_sort | Angelika Wrzesińska |
| collection | DOAJ |
| description | There is an urgent need for the development of elastic dielectric materials for flexible organic field effect transistors (OFETs). In this work, detailed analysis of the AC and DC electrical conductivity of a series of flexible poly(dimethylsiloxane) (PDMS) polymers crosslinked by metal-ligand coordination in comparison to neat PDMS was performed for the first time by means of broadband dielectric spectroscopy. The ligand was 2,2-bipyridine-4,4-dicarboxylic amide, and Ni<sup>2+</sup>, Mn<sup>2+</sup>, and Zn<sup>2+</sup> were introduced for Cl<sup>−</sup>, Br<sup>−</sup>, and I<sup>−</sup> salts. Introduction of metal salt and creation of coordination bonds resulted in higher permittivity values increasing in an order: neat PDMS < Ni<sup>2+</sup> < Mn<sup>2+</sup> < Zn<sup>2+</sup>; accompanied by conductivity values of the materials increasing in an order: neat PDMS < Cl<sup>−</sup> < I<sup>−</sup> < Br<sup>−</sup>. Conductivity relaxation time plot as a function of temperature, showed Vogel-Fulcher–Tammann dependance for the Br<sup>−</sup> salts and Arrhenius type for the Cl<sup>−</sup> and I<sup>−</sup> salts. Performed study revealed that double-edged challenge can be obtained, i.e., dielectric materials with elevated value of dielectric permittivity without deterioration too much the non-conductive nature of the polymer. This opens up new perspectives for the production of flexible dielectrics suitable for gate insulators in OFETs. Among the synthesized organometallic materials, those with chlorides salts are the most promising for such applications. |
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| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T13:03:48Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-5a54f7835e8643659e305343ad8152de2023-11-21T11:18:50ZengMDPI AGPolymers2073-43602021-03-0113695610.3390/polym13060956Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand CoordinationAngelika Wrzesińska0Aleksandra Wypych-Puszkarz1Izabela Bobowska2Jacek Ulański3Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, PolandDepartment of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, PolandDepartment of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, PolandDepartment of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, PolandThere is an urgent need for the development of elastic dielectric materials for flexible organic field effect transistors (OFETs). In this work, detailed analysis of the AC and DC electrical conductivity of a series of flexible poly(dimethylsiloxane) (PDMS) polymers crosslinked by metal-ligand coordination in comparison to neat PDMS was performed for the first time by means of broadband dielectric spectroscopy. The ligand was 2,2-bipyridine-4,4-dicarboxylic amide, and Ni<sup>2+</sup>, Mn<sup>2+</sup>, and Zn<sup>2+</sup> were introduced for Cl<sup>−</sup>, Br<sup>−</sup>, and I<sup>−</sup> salts. Introduction of metal salt and creation of coordination bonds resulted in higher permittivity values increasing in an order: neat PDMS < Ni<sup>2+</sup> < Mn<sup>2+</sup> < Zn<sup>2+</sup>; accompanied by conductivity values of the materials increasing in an order: neat PDMS < Cl<sup>−</sup> < I<sup>−</sup> < Br<sup>−</sup>. Conductivity relaxation time plot as a function of temperature, showed Vogel-Fulcher–Tammann dependance for the Br<sup>−</sup> salts and Arrhenius type for the Cl<sup>−</sup> and I<sup>−</sup> salts. Performed study revealed that double-edged challenge can be obtained, i.e., dielectric materials with elevated value of dielectric permittivity without deterioration too much the non-conductive nature of the polymer. This opens up new perspectives for the production of flexible dielectrics suitable for gate insulators in OFETs. Among the synthesized organometallic materials, those with chlorides salts are the most promising for such applications.https://www.mdpi.com/2073-4360/13/6/956PMDS metal–ligand complexesconduction mechanismbroadband dielectric spectroscopy |
| spellingShingle | Angelika Wrzesińska Aleksandra Wypych-Puszkarz Izabela Bobowska Jacek Ulański Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination Polymers PMDS metal–ligand complexes conduction mechanism broadband dielectric spectroscopy |
| title | Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination |
| title_full | Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination |
| title_fullStr | Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination |
| title_full_unstemmed | Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination |
| title_short | Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination |
| title_sort | effects of counter anions on ac and dc electrical conductivity in poly dimethylsiloxane crosslinked by metal ligand coordination |
| topic | PMDS metal–ligand complexes conduction mechanism broadband dielectric spectroscopy |
| url | https://www.mdpi.com/2073-4360/13/6/956 |
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