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Conductive hydrophobic graphene oxide films via laser-scribed surface modification

HENRY APSEY, Donald Hill, Thomas M. McCoy, Marcos Villeda-Hernandez Orcid Logo, Charl F.J. Faul Orcid Logo, Shirin Alexander Orcid Logo

Journal of Colloid and Interface Science, Volume: 687, Pages: 189 - 196

Swansea University Authors: HENRY APSEY, Donald Hill, Shirin Alexander Orcid Logo

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DOI (Published version): 10.1016/j.jcis.2025.02.055

Abstract

Graphene oxide (GO) can be surface modified for various purposes, including enhancing its properties or tailoring its behaviour for specific applications such as biosensing. Herein we report the behaviour of a carboxylate functionalized graphene oxide that is both water repellent and electrically co...

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Published in: Journal of Colloid and Interface Science
ISSN: 0021-9797 1095-7103
Published: Elsevier Inc 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa68863
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spelling 2025-02-18T14:29:04.3131612 v2 68863 2025-02-11 Conductive hydrophobic graphene oxide films via laser-scribed surface modification a0c493aece11b972ac4fd108228ab199 HENRY APSEY HENRY APSEY true false d542c5f6c548c25ef4ab7cb51ee71650 Donald Hill Donald Hill true false 0773cc55f7caf77817be08806b8b7497 0000-0002-4404-0026 Shirin Alexander Shirin Alexander true false 2025-02-11 Graphene oxide (GO) can be surface modified for various purposes, including enhancing its properties or tailoring its behaviour for specific applications such as biosensing. Herein we report the behaviour of a carboxylate functionalized graphene oxide that is both water repellent and electrically conductive. The GO is first produced using a modified Hummers method and then functionalized with a hyperbranched isostearic alcohol through an esterification reaction. The as-deposited functionalized GO films were observed to cause “petal-like” wetting of water, whereby droplets exhibited contact angles (CAs) greater than 150° and remaining pinned to the surface. To improve their conductivity, films of the functionalized GO deposited onto glass were laser-scribed to reduce some of the specific, adjoining regions of oxidic carbon to partially restore some of the sp2 C network. This improved the conductivity of the as-deposited GO films by approximately four orders of magnitude from 0.002 to ∼20 S/m using the low laser scan speed of 250 mm/min. It was observed that with a high laser scan speed of 500 mm/min some of the hydrophobic character was retained (CAs ∼110°), whilst maintaining conductivities of up to 0.17 S/m. Consequently, these materials show promise for applications such as biosensing materials, where tuneable hydrophobicity combined with conductivity are required characteristics. Journal Article Journal of Colloid and Interface Science 687 189 196 Elsevier Inc 0021-9797 1095-7103 Wettability; Wearable electronics; Conductive; Waterproof; Water-repellent; Carbon materials; Biosensors 1 6 2025 2025-06-01 10.1016/j.jcis.2025.02.055 COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) Financial support was provided by EPSRC DTP EP/R51312X/1 and Salts Healthcare. 2025-02-18T14:29:04.3131612 2025-02-11T10:37:43.5280935 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering HENRY APSEY 1 Donald Hill 2 Thomas M. McCoy 3 Marcos Villeda-Hernandez 0000-0002-0468-7247 4 Charl F.J. Faul 0000-0001-6224-3073 5 Shirin Alexander 0000-0002-4404-0026 6 68863__33633__97bd32a9f03d4cf8bd1e8384b08163cc.pdf 68863.VOR.pdf 2025-02-18T14:25:46.8685999 Output 2764154 application/pdf Version of Record true © 2025 The Author(s). This is an open access article distributed under the terms of the Creative Commons CC-BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Conductive hydrophobic graphene oxide films via laser-scribed surface modification
spellingShingle Conductive hydrophobic graphene oxide films via laser-scribed surface modification
HENRY APSEY
Donald Hill
Shirin Alexander
title_short Conductive hydrophobic graphene oxide films via laser-scribed surface modification
title_full Conductive hydrophobic graphene oxide films via laser-scribed surface modification
title_fullStr Conductive hydrophobic graphene oxide films via laser-scribed surface modification
title_full_unstemmed Conductive hydrophobic graphene oxide films via laser-scribed surface modification
title_sort Conductive hydrophobic graphene oxide films via laser-scribed surface modification
author_id_str_mv a0c493aece11b972ac4fd108228ab199
d542c5f6c548c25ef4ab7cb51ee71650
0773cc55f7caf77817be08806b8b7497
author_id_fullname_str_mv a0c493aece11b972ac4fd108228ab199_***_HENRY APSEY
d542c5f6c548c25ef4ab7cb51ee71650_***_Donald Hill
0773cc55f7caf77817be08806b8b7497_***_Shirin Alexander
author HENRY APSEY
Donald Hill
Shirin Alexander
author2 HENRY APSEY
Donald Hill
Thomas M. McCoy
Marcos Villeda-Hernandez
Charl F.J. Faul
Shirin Alexander
format Journal article
container_title Journal of Colloid and Interface Science
container_volume 687
container_start_page 189
publishDate 2025
institution Swansea University
issn 0021-9797
1095-7103
doi_str_mv 10.1016/j.jcis.2025.02.055
publisher Elsevier Inc
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
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description Graphene oxide (GO) can be surface modified for various purposes, including enhancing its properties or tailoring its behaviour for specific applications such as biosensing. Herein we report the behaviour of a carboxylate functionalized graphene oxide that is both water repellent and electrically conductive. The GO is first produced using a modified Hummers method and then functionalized with a hyperbranched isostearic alcohol through an esterification reaction. The as-deposited functionalized GO films were observed to cause “petal-like” wetting of water, whereby droplets exhibited contact angles (CAs) greater than 150° and remaining pinned to the surface. To improve their conductivity, films of the functionalized GO deposited onto glass were laser-scribed to reduce some of the specific, adjoining regions of oxidic carbon to partially restore some of the sp2 C network. This improved the conductivity of the as-deposited GO films by approximately four orders of magnitude from 0.002 to ∼20 S/m using the low laser scan speed of 250 mm/min. It was observed that with a high laser scan speed of 500 mm/min some of the hydrophobic character was retained (CAs ∼110°), whilst maintaining conductivities of up to 0.17 S/m. Consequently, these materials show promise for applications such as biosensing materials, where tuneable hydrophobicity combined with conductivity are required characteristics.
published_date 2025-06-01T08:17:07Z
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