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Synthesis and characterization of ammonia strengthened and ambient dried N-doped hydrophilic graphene aerogel with good electrical conductivity

Lookup NU author(s): Feng Xiong Xiong, Jiabin Wang, Neville DickmanORCiD, Dr Yujing Liu, Professor Lidija SillerORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

We present a novel ‘one-pot’ approach for strengthening reduced graphene oxide (rGO) hydrogels by nitrogen doping. Ammonia is directly added to the precursor reaction mixture prior to hydrothermal gel formation, as opposed to treating as-synthesised rGO hydrogel by ammonia in a second hydrothermal process. This process ensures that the resulting hydrogels are sufficiently robust that aerogels may then be produced by natural drying under ambient temperture and pressure. The as-formed rGO aerogel possesses a Young’s modulus as high as 28 kPa and exhibits superelasticity, withstanding strains of up to 95%. Moreover, the strengthed graphene aerogel possesses an electrical conductivity of 1.5 S cm^-1 and a specific surface area of 280.0 m² g^-1. Although the rGO aerogel was sufficiently reduced to provide good electrical conductivity, it retains a water contact angle of 47 ± 1º, indicating hydrophilic behaviour.

Publication metadata

Author(s): Xiong F, Wang J, Dickman N, Liu Y, Hunt MRC, Siller L

Publication type: Article

Publication status: Published

Journal: Vacuum

Year: 2025

Volume: 232

Print publication date: 01/02/2025

Online publication date: 20/11/2024

Acceptance date: 19/11/2024

Date deposited: 21/11/2024

ISSN (print): 0042-207X

ISSN (electronic): 1879-2715

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.vacuum.2024.113846

DOI: 10.1016/j.vacuum.2024.113846

ePrints DOI: 10.57711/vjhe-fz60

Data Access Statement: Data will be made available on request.

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