Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites
The properties of newly synthesized Cu<sub>2</sub>O/CuO-decorated TiO<sub>2</sub>/graphene oxide (GO) nanocomposites (NC) were analyzed aiming to obtain insight into their photocatalytic behavior and their various applications, including water remediation, self-cleaning surfa...
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MDPI AG
2022-11-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/23/23/14703 |
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| author | Daniela Bala Iulia Matei Gabriela Ionita Dragos-Viorel Cosma Marcela-Corina Rosu Maria Stanca Carmen Gaidau Maria Baleanu Marian Virgolici Ioana Stanculescu |
| author_facet | Daniela Bala Iulia Matei Gabriela Ionita Dragos-Viorel Cosma Marcela-Corina Rosu Maria Stanca Carmen Gaidau Maria Baleanu Marian Virgolici Ioana Stanculescu |
| author_sort | Daniela Bala |
| collection | DOAJ |
| description | The properties of newly synthesized Cu<sub>2</sub>O/CuO-decorated TiO<sub>2</sub>/graphene oxide (GO) nanocomposites (NC) were analyzed aiming to obtain insight into their photocatalytic behavior and their various applications, including water remediation, self-cleaning surfaces, antibacterial materials, and electrochemical sensors. The physico-chemical methods of research were photoluminescence (PL), electron paramagnetic resonance (EPR) spectroscopy, cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The solid samples evidenced an EPR signal that can be attributed to the oxygen-vacancy defects and copper ions in correlation with PL results. Free radicals generated before and after UV-Vis irradiation of powders and aqueous dispersions of Cu<sub>2</sub>O/CuO-decorated TiO<sub>2</sub>/GO nanocomposites were studied by EPR spectroscopy using two spin traps, DMPO (5,5-dimethyl-1-pyrroline-N-oxide) and CPH (1-hydroxy-3-carboxy-2,2,5,5-tetramethylpyrrolidine), to highlight the formation of hydroxyl and superoxide reactive oxygen species, respectively. The electrochemical characterization of the NC modified carbon-paste electrodes (CPE) was carried out by CV and DPV. As such, modified carbon-paste electrodes were prepared by mixing carbon paste with copper oxides-decorated TiO<sub>2</sub>/GO nanocomposites. We have shown that GO reduces the recombination process in TiO<sub>2</sub> by immediate electron transfer from excited TiO<sub>2</sub> to GO sheets. The results suggest that differences in the PL, respectively, EPR data and electrochemical behavior, are due to the different copper oxides and GO content, presenting new perspectives of materials functionalization. |
| first_indexed | 2024-03-09T17:46:47Z |
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| id | doaj.art-b9056de0542a46f7bcb0861811b4424e |
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| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-09T17:46:47Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-b9056de0542a46f7bcb0861811b4424e2023-11-24T11:06:27ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672022-11-0123231470310.3390/ijms232314703Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide NanocompositesDaniela Bala0Iulia Matei1Gabriela Ionita2Dragos-Viorel Cosma3Marcela-Corina Rosu4Maria Stanca5Carmen Gaidau6Maria Baleanu7Marian Virgolici8Ioana Stanculescu9Physical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, No. 4-12, 030018 Bucharest, Romania“Ilie Murgulescu” Institute of Physical Chemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical Chemistry, 202 Splaiul Independentei, 060021 Bucharest, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, 67–103 Donat Street, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, 67–103 Donat Street, 400293 Cluj-Napoca, RomaniaLeather Research Department, National Institute for Textiles and Leather, Division Leather and Footwear Research Institute (ICPI), 93 Ion Minulescu Street, 031215 Bucharest, RomaniaLeather Research Department, National Institute for Textiles and Leather, Division Leather and Footwear Research Institute (ICPI), 93 Ion Minulescu Street, 031215 Bucharest, RomaniaHoria Hulubei National Institute of Research and Development for Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Magurele, RomaniaHoria Hulubei National Institute of Research and Development for Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Magurele, RomaniaPhysical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, No. 4-12, 030018 Bucharest, RomaniaThe properties of newly synthesized Cu<sub>2</sub>O/CuO-decorated TiO<sub>2</sub>/graphene oxide (GO) nanocomposites (NC) were analyzed aiming to obtain insight into their photocatalytic behavior and their various applications, including water remediation, self-cleaning surfaces, antibacterial materials, and electrochemical sensors. The physico-chemical methods of research were photoluminescence (PL), electron paramagnetic resonance (EPR) spectroscopy, cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The solid samples evidenced an EPR signal that can be attributed to the oxygen-vacancy defects and copper ions in correlation with PL results. Free radicals generated before and after UV-Vis irradiation of powders and aqueous dispersions of Cu<sub>2</sub>O/CuO-decorated TiO<sub>2</sub>/GO nanocomposites were studied by EPR spectroscopy using two spin traps, DMPO (5,5-dimethyl-1-pyrroline-N-oxide) and CPH (1-hydroxy-3-carboxy-2,2,5,5-tetramethylpyrrolidine), to highlight the formation of hydroxyl and superoxide reactive oxygen species, respectively. The electrochemical characterization of the NC modified carbon-paste electrodes (CPE) was carried out by CV and DPV. As such, modified carbon-paste electrodes were prepared by mixing carbon paste with copper oxides-decorated TiO<sub>2</sub>/GO nanocomposites. We have shown that GO reduces the recombination process in TiO<sub>2</sub> by immediate electron transfer from excited TiO<sub>2</sub> to GO sheets. The results suggest that differences in the PL, respectively, EPR data and electrochemical behavior, are due to the different copper oxides and GO content, presenting new perspectives of materials functionalization.https://www.mdpi.com/1422-0067/23/23/14703TiO<sub>2</sub> nanocompositesEPRphotoluminescenceelectrochemistry |
| spellingShingle | Daniela Bala Iulia Matei Gabriela Ionita Dragos-Viorel Cosma Marcela-Corina Rosu Maria Stanca Carmen Gaidau Maria Baleanu Marian Virgolici Ioana Stanculescu Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites International Journal of Molecular Sciences TiO<sub>2</sub> nanocomposites EPR photoluminescence electrochemistry |
| title | Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites |
| title_full | Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites |
| title_fullStr | Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites |
| title_full_unstemmed | Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites |
| title_short | Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO<sub>2</sub>/Graphene Oxide Nanocomposites |
| title_sort | luminescence paramagnetic and electrochemical properties of copper oxides decorated tio sub 2 sub graphene oxide nanocomposites |
| topic | TiO<sub>2</sub> nanocomposites EPR photoluminescence electrochemistry |
| url | https://www.mdpi.com/1422-0067/23/23/14703 |
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