Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties
Graphene oxide (GO) can be defined as a single monolayer of graphite with oxygen-containing functionalities such as epoxides, alcohols, and carboxylic acids. It is an interesting alternative to graphene for many applications due to its exceptional properties and feasibility of functionalization. In...
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MDPI AG
2020-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/12/2532 |
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| author | Carlos Sainz-Urruela Soledad Vera-López María Paz San Andrés Ana M. Díez-Pascual |
| author_facet | Carlos Sainz-Urruela Soledad Vera-López María Paz San Andrés Ana M. Díez-Pascual |
| author_sort | Carlos Sainz-Urruela |
| collection | DOAJ |
| description | Graphene oxide (GO) can be defined as a single monolayer of graphite with oxygen-containing functionalities such as epoxides, alcohols, and carboxylic acids. It is an interesting alternative to graphene for many applications due to its exceptional properties and feasibility of functionalization. In this study, electrochemically exfoliated graphene oxides (EGOs) with different amounts of surface groups, hence level of oxidation, were prepared by an electrochemical two-stage approach using graphite as raw material. A complete characterization of the EGOs was carried out in order to correlate their surface topography, interlayer spacing, defect content, and specific surface area (SSA) with their electrical, thermal, and mechanical properties. It has been found that the SSA has a direct relationship with the d-spacing. The EGOs electrical resistance decreases with increasing SSA while rises with increasing the D/G band intensity ratio in the Raman spectra, hence the defect content. Their thermal stability under both nitrogen and dry air atmospheres depends on both their oxidation level and defect content. Their macroscopic mechanical properties, namely the Young’s modulus and tensile strength, are influenced by the defect content, while no correlation was found with their SSA or interlayer spacing. Young moduli values as high as 54 GPa have been measured, which corroborates that the developed method preserves the integrity of the graphene flakes. Understanding the structure-property relationships in these materials is useful for the design of modified GOs with controllable morphologies and properties for a wide range of applications in electrical/electronic devices. |
| first_indexed | 2024-03-10T13:59:58Z |
| format | Article |
| id | doaj.art-4f51c2b100be4872a83f7b2cbfd751ab |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T13:59:58Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-4f51c2b100be4872a83f7b2cbfd751ab2023-11-21T01:11:02ZengMDPI AGNanomaterials2079-49912020-12-011012253210.3390/nano10122532Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and PropertiesCarlos Sainz-Urruela0Soledad Vera-López1María Paz San Andrés2Ana M. Díez-Pascual3Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Sciences, University of Alcalá, Alcalá de Henares, 28805 Madrid, SpainDepartment of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Sciences, University of Alcalá, Alcalá de Henares, 28805 Madrid, SpainDepartment of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Sciences, University of Alcalá, Alcalá de Henares, 28805 Madrid, SpainDepartment of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Faculty of Sciences, University of Alcalá, Alcalá de Henares, 28805 Madrid, SpainGraphene oxide (GO) can be defined as a single monolayer of graphite with oxygen-containing functionalities such as epoxides, alcohols, and carboxylic acids. It is an interesting alternative to graphene for many applications due to its exceptional properties and feasibility of functionalization. In this study, electrochemically exfoliated graphene oxides (EGOs) with different amounts of surface groups, hence level of oxidation, were prepared by an electrochemical two-stage approach using graphite as raw material. A complete characterization of the EGOs was carried out in order to correlate their surface topography, interlayer spacing, defect content, and specific surface area (SSA) with their electrical, thermal, and mechanical properties. It has been found that the SSA has a direct relationship with the d-spacing. The EGOs electrical resistance decreases with increasing SSA while rises with increasing the D/G band intensity ratio in the Raman spectra, hence the defect content. Their thermal stability under both nitrogen and dry air atmospheres depends on both their oxidation level and defect content. Their macroscopic mechanical properties, namely the Young’s modulus and tensile strength, are influenced by the defect content, while no correlation was found with their SSA or interlayer spacing. Young moduli values as high as 54 GPa have been measured, which corroborates that the developed method preserves the integrity of the graphene flakes. Understanding the structure-property relationships in these materials is useful for the design of modified GOs with controllable morphologies and properties for a wide range of applications in electrical/electronic devices.https://www.mdpi.com/2079-4991/10/12/2532graphene oxideoxidation levelstructure-property relationshipsurface topographyspecific surface areainterlayer spacing |
| spellingShingle | Carlos Sainz-Urruela Soledad Vera-López María Paz San Andrés Ana M. Díez-Pascual Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties Nanomaterials graphene oxide oxidation level structure-property relationship surface topography specific surface area interlayer spacing |
| title | Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties |
| title_full | Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties |
| title_fullStr | Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties |
| title_full_unstemmed | Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties |
| title_short | Graphene Oxides Derivatives Prepared by an Electrochemical Approach: Correlation between Structure and Properties |
| title_sort | graphene oxides derivatives prepared by an electrochemical approach correlation between structure and properties |
| topic | graphene oxide oxidation level structure-property relationship surface topography specific surface area interlayer spacing |
| url | https://www.mdpi.com/2079-4991/10/12/2532 |
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