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@article{Koutsioukis2022,

title = {Stable Dispersion of Graphene in Water, Promoted by High-Yield, Scalable Exfoliation of Graphite in Natural Aqueous Extracts: The Role of Hydrophobic Organic Molecules},

author = {A. Koutsioukis and G. Florakis and E. Sakellis and and V. Georgakilas},

doi = {10.1021/acssuschemeng.2c02326 },

year  = {2022},

date = {2022-09-12},

urldate = {2022-09-12},

journal = {ACS Sustainable Chemistry & Engineering },

volume = {10},

issue = {38},

pages = {12552-12558 },

abstract = {The van der Waals interactions between graphene nanosheets and hydrophobic molecules derived from natural aqueous extracts are indicated as the driving force for high-yield exfoliation of graphite and effective dispersion of graphene produced in pure water. Although it seems paradoxical, the absorption of small hydrophobic organic molecules on large graphene surfaces decreases the hydrophobic character of graphene nanosheets, resulting in significant improvement of graphene dispersibility in water. This fact reveals a totally novel mechanism to produce high-quality graphene nanosheets by liquid exfoliation of graphite in natural aqueous extracts and their dispersion in water at relatively high concentrations. This method is easily scalable, environmentally friendly, and low cost and showed remarkable yields. More importantly, the role of van der Waals interactions in preventing the hydrophobic effect is an unexplored area that could open new pathways for the development of two-dimensional materials or the stabilization of colloidal systems such as polymers, proteins, or other biomolecules.},

keywords = {2D materials, Anode materials, Carbon, Colloids, Curcuma, graphene, hydrophobic interactions, Hydrophobicity, liquid exfoliation, Two dimensional materials},

pubstate = {published},

tppubtype = {article}

}

@article{Barmpakos2021,

title = {Evaluation of Inkjet-Printed Reduced and Functionalized Water-Dispersible Graphene Oxide and Graphene on Polymer Substrate—Application to Printed Temperature Sensors},

author = {D. Barmpakos and V. Belessi and R. Schelwald and G. Kaltsas },

doi = {https://doi.org/10.3390/nano11082025 },

year  = {2021},

date = {2021-01-06},

urldate = {2021-01-06},

journal = {Nanomaterials},

volume = {11},

issue = {2025},

abstract = {The present work reports on the detailed electro-thermal evaluation of a highly water dispersible, functionalized reduced graphene oxide (f-rGO) using inkjet printing technology. Aiming in the development of printed electronic devices, a flexible polyimide substrate was used for the structures’ formation. A direct comparison between the f-rGO ink dispersion and a commercial graphene inkjet ink is also presented. Extensive droplet formation analysis was performed in order to evaluate the repeatable and reliable jetting from an inkjet printer under study. Electrical characterization was conducted and the electrical characteristics were assessed under different temperatures, showing that the water dispersion of the f-rGO is an excellent candidate for application in printed thermal sensors and microheaters. It was observed that the proposed f-rGO ink presents a tenfold increased temperature coefficient of resistance compared to the commercial graphene ink (G). A successful direct interconnection implementation of both materials with commercial Ag-nanoparticle ink lines was also demonstrated, thus allowing the efficient electrical interfacing of the printed structures. The investigated ink can be complementary utilized for developing fully printed devices with various characteristics, all on flexible substrates with cost-effective, few-step processes.},

keywords = {flexible temperature sensors, graphene, inkjet-printed sensors, printed temperature sensors, Reduced graphene oxide},

pubstate = {published},

tppubtype = {article}

}