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Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks

Tuan Kien Nguyen, Md. Joynul Abedin, Naimeh Naseri, Meysam Sharifzadeh Mirshekarloo, Olalekan Solomon Oluwole, Petar Jovanovic, Davide Deganello Orcid Logo, Rico Tabor, Mainak Majumder Orcid Logo

Advanced Materials Technologies

Swansea University Author: Davide Deganello Orcid Logo

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DOI (Published version): 10.1002/admt.202501878

Abstract

Conductive inks formulated from graphene-based materials are essential for translating graphene’s potential into real-world applications. High-concentration inks are particularly valuable, enabling fewer deposition steps, reduced drying costs, and improved film uniformity. However, increasing graphe...

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Published in: Advanced Materials Technologies
ISSN: 2365-709X 2365-709X
Published: Wiley 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa71296
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However, increasing graphene concentration typically leads to a steep rise in viscosity, limiting compatibility with most printing techniques. In this work, we address this challenge by compacting expanded reduced graphite oxide into dense-block reduced graphite oxide, termed DB-rGtO, allowing the formulation of stable dispersions of graphene-derived material at concentrations up to 200 mg&#xB7;mL&#x207B;&#xB9;, while maintaining manageable flowability and deformation resistance. We demonstrate that solvation of DB-rGtO particles serves as a fundamental strategy to modulate ink viscosity, enabling property tuning at high solids content. The degree of solvation, quantified using polarised light microscopy, correlates well with viscosity predictions based on the Krieger&#x2013;Dougherty model. 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spelling 2026-02-09T14:07:34.1659808 v2 71296 2026-01-22 Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks ea38a0040bdfd3875506189e3629b32a 0000-0001-8341-4177 Davide Deganello Davide Deganello true false 2026-01-22 ACEM Conductive inks formulated from graphene-based materials are essential for translating graphene’s potential into real-world applications. High-concentration inks are particularly valuable, enabling fewer deposition steps, reduced drying costs, and improved film uniformity. However, increasing graphene concentration typically leads to a steep rise in viscosity, limiting compatibility with most printing techniques. In this work, we address this challenge by compacting expanded reduced graphite oxide into dense-block reduced graphite oxide, termed DB-rGtO, allowing the formulation of stable dispersions of graphene-derived material at concentrations up to 200 mg·mL⁻¹, while maintaining manageable flowability and deformation resistance. We demonstrate that solvation of DB-rGtO particles serves as a fundamental strategy to modulate ink viscosity, enabling property tuning at high solids content. The degree of solvation, quantified using polarised light microscopy, correlates well with viscosity predictions based on the Krieger–Dougherty model. Using nitrogen-doped expanded reduced graphite oxide as the starting material, this approach enables single-pass printed films and patterns with conductivities ranging from 5 to 10 Ω·□⁻¹. Our findings establish general design rules for formulating concentrated, conductive graphene-based inks with little to no additive, adaptable across various deposition techniques for producing high-resolution, high-fidelity features. Journal Article Advanced Materials Technologies 0 Wiley 2365-709X 2365-709X binder-free ink; graphene dispersion; graphene; printing; rheology 22 12 2025 2025-12-22 10.1002/admt.202501878 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University Australian Research Council; Ionic Industries Pty Ltd. Grant Number: IH210100025 2026-02-09T14:07:34.1659808 2026-01-22T11:57:41.1962860 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering Tuan Kien Nguyen 1 Md. Joynul Abedin 2 Naimeh Naseri 3 Meysam Sharifzadeh Mirshekarloo 4 Olalekan Solomon Oluwole 5 Petar Jovanovic 6 Davide Deganello 0000-0001-8341-4177 7 Rico Tabor 8 Mainak Majumder 0000-0002-0194-9387 9 71296__36085__577d46ca357a4a84b880391888d82e98.pdf Accepted manuscript_Nguyen_et_Al_2025.pdf 2026-01-22T12:07:22.7613933 Output 1264772 application/pdf Accepted Manuscript true Author accepted manuscript document released under the terms of a Creative Commons CC-BY licence using the Swansea University Research Publications Policy (rights retention). true eng https://creativecommons.org/licenses/by/4.0/deed.en
title Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
spellingShingle Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
Davide Deganello
title_short Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
title_full Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
title_fullStr Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
title_full_unstemmed Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
title_sort Solvation‐Modulated Dispersions of Reduced Graphite Oxide Toward Binder‐Free Conductive Inks
author_id_str_mv ea38a0040bdfd3875506189e3629b32a
author_id_fullname_str_mv ea38a0040bdfd3875506189e3629b32a_***_Davide Deganello
author Davide Deganello
author2 Tuan Kien Nguyen
Md. Joynul Abedin
Naimeh Naseri
Meysam Sharifzadeh Mirshekarloo
Olalekan Solomon Oluwole
Petar Jovanovic
Davide Deganello
Rico Tabor
Mainak Majumder
format Journal article
container_title Advanced Materials Technologies
container_volume 0
publishDate 2025
institution Swansea University
issn 2365-709X
2365-709X
doi_str_mv 10.1002/admt.202501878
publisher Wiley
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 Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str 1
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description Conductive inks formulated from graphene-based materials are essential for translating graphene’s potential into real-world applications. High-concentration inks are particularly valuable, enabling fewer deposition steps, reduced drying costs, and improved film uniformity. However, increasing graphene concentration typically leads to a steep rise in viscosity, limiting compatibility with most printing techniques. In this work, we address this challenge by compacting expanded reduced graphite oxide into dense-block reduced graphite oxide, termed DB-rGtO, allowing the formulation of stable dispersions of graphene-derived material at concentrations up to 200 mg·mL⁻¹, while maintaining manageable flowability and deformation resistance. We demonstrate that solvation of DB-rGtO particles serves as a fundamental strategy to modulate ink viscosity, enabling property tuning at high solids content. The degree of solvation, quantified using polarised light microscopy, correlates well with viscosity predictions based on the Krieger–Dougherty model. Using nitrogen-doped expanded reduced graphite oxide as the starting material, this approach enables single-pass printed films and patterns with conductivities ranging from 5 to 10 Ω·□⁻¹. Our findings establish general design rules for formulating concentrated, conductive graphene-based inks with little to no additive, adaptable across various deposition techniques for producing high-resolution, high-fidelity features.
published_date 2025-12-22T05:35:06Z
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