Publication: Water based reduced graphene oxide ink for temperature sensor application
| datacite.subject.fos | oecd::Engineering and technology::Materials engineering | |
| dc.contributor.author | Junaid, Mohammad Khan | |
| dc.date.accessioned | 2025-11-27T04:21:23Z | |
| dc.date.available | 2025-11-27T04:21:23Z | |
| dc.date.issued | 2024-06-01 | |
| dc.description.abstract | The adoption of eco-friendly water-based inks, as alternatives to organic solvent-based inks, is a key strategy for minimizing environmental impacts. Graphene oxide (GO) nanofillers can be used as a filler to produce water-based conductive ink for printed electronics applications. However, the higher surface tension and lower stability are major drawbacks which limit its printing properties. The objective of this study is to produce an eco-friendly ink using GO with long term stability and capability to print using inkjet printer for applications in printed electronics and sensors. The methodology utilized probe sonication to produce aqueous GO ink with natural surfactants (cellulose nanocrystals, gum arabic, and alkali lignin) for improving wetting and dispersion stability. Varying concentrations of alkali lignin and viscosity were assessed for smoother inkjet printing experience. An in-situ reduction process was carried out using natural substances (tea, coffee, ascorbic acid) through inkjet printing, enabling continuous manufacturing of GO-based inks without external processes. Finally, the application of the GO ink was demonstrated by fabricating a flexible temperature sensor. Among different natural surfactants, the GO ink produced with alkali lignin showed the highest zeta potential of -36.53 mV as compared cellulose nanocrystals and gum arabic assisted GO ink. The GO ink also demonstrated improved stability, with a 25% increase in zeta potential and 84.3% higher maximum absorption at 3 mg/ml of alkali lignin concentration along with continuous morphological properties of printed patterns. In-situ reduction using ascorbic acid restored electrical conductivity (1250 ā1 Sm ), indicating enhanced conductive networks. The electrical conductivity was found to be reduced by only 2.6 % after 100 bending cycles, whereas a decrease of only 0.6 % was observed after 10 rolling and straightening cycles indicating excellent flexibility which is very important for printed electronics applications. The ascorbic acid reduced sample showed an increase in the ID/IG from 1.058 to 1.15, and the interlayer distance decreased from 0.395 to 0.385 nm indicating good reduction efficiency. The resulting temperature sensor exhibited a notable thermal coefficient of resistance (TCR) of 1.21, showcasing heightened sensitivity and response within the temperature range of 25 to 52 ā. These results highlight the potential of alkali lignin as a natural surfactant for improving the performance and applicability of inkjet-printable GO inks in printed and flexible electronics. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/23208 | |
| dc.language.iso | en | |
| dc.title | Water based reduced graphene oxide ink for temperature sensor application | |
| dc.type | Resource Types::text::thesis::doctoral thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |