| Full text | |
| Author(s): |
Monteiro, Daniela A.
[1]
;
Gozzi, Giovani
[1]
;
Chinaglia, Dante Luis
[1]
;
Oliveira, Jr., Osvaldo N.
[2]
;
de Vicente, Fabio S.
[1]
Total Authors: 5
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Dept Phys, Inst Geosci & Exact Sci, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Phys, CP 369, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Synthetic Metals; v. 267, SEP 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
In this work, we employed impedance spectroscopy measurements to investigate the electrical properties of hybrid films obtained with the sol-gel process using 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetra-ethylorthosilicate (TEOS) at different GPTMS/TEOS molar ratios and temperatures of thermal treatment. For the GPTMS/TEOS-derived samples with 1:1 composition, the DC conductivity (adc) and charge carrier mobility (mu dc) increased linearly with heat treatment temperature from 25 to 80 degrees C, while adc increased from 3.2 to 22.4 nS/cm with a 7-fold increase in the GPTMS concentration. These results could be rationalized with the Miller-Abraham model using a charge carrier activation energy of 0.54 +/- 0.03 eV. Using FTIR spectroscopy we demonstrated that the structural arrangement of the hybrid matrix involves epoxy ring opening, thus favoring proton con-duction, which occurs as in the Grotthuss mechanism via hopping between nearest oxygen atoms of polymerized glycidoxypropyl groups. It is significant that electrical properties of organic/silica matrices can be predicted and tuned for tailored applications using the modeling presented here. (AU) | |
| FAPESP's process: | 11/18149-5 - Study of Photosensitivity and photoluminescence in organically modified silicates films prepared by sol-gel |
| Grantee: | Fábio Simões de Vicente |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/14262-7 - Nanostructured films from biologically-relevant materials |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |