Printed electronics has emerged as a pathway for large scale, flexible, and wearable devices[1], Internet-of-Things[2] and smart textiles[3]. Graphene and related twodimensional (2D) materials offer an ideal platform of novel materials for high performance printed electronics [4,5]. Electronic inks from 2D materials with different electronic properties have achieved the right maturity to print the different elements of a device: semiconducting
or semimetallic inks in the active layer, insulating inks for dielectrics, and conducting inks for electrodes[6].
In this talk I will describe the charge transport mechanisms of surfactant- and solvent-free inkjet-printed thin-film devices of representative few-layer graphene (semi-metal), molybdenum disulphide (MoS2, semiconductor) and titanium carbide MXene (Ti3C2, metal) by investigating the temperature, gate and magnetic field dependencies of their electrical conductivity.[7]
Results show that charge transport in printed few-layer MXene and MoS2 devices is dominated by the intrinsic transport mechanism of the constituent flakes. On the other hand, charge transport in printed few-layer graphene devices is dominated by the transport mechanism between different flakes.[7]
I will then discuss the heat transport in nanostructured films of h-BN and Ti3C2, reporting a departure from the Wiedmann-Franz law, paving the way for electrically insulating and thermally conducting coatings for applications in effective cooling of electronic circuits and optoelectronic devices, and heat management in smart textiles. [8]
[1] Torrisi, F. & Carey, T. “Graphene, related twodimensional crystals and hybrid systems for printed and wearable electronics” Nano Today 23, 73 (2018).
[2] C. Scholten et al. “Advanced Technologies for Industry – Product Watch: Flexible and printed electronics”, doi: 10.2826/29513 (2021).
[3] Carey, T. et al. “Fully inkjet-printed two-dimensional material field-effect heterojunctions for wearable and textile Electronics” Nat. Commun. 8, 1202 (2017).
[4] Torrisi, F. et al. Inkjet-printed graphene electronics. ACS Nano 6, 2992{3006 (2012).
[5] F. Torrisi & T. Carey “Printing 2D Materials” in “Flexible Carbon-based Electronics” Editors P. Samori and V. Palermo, Ed.: Wiley-VCH, Weinheim, Germany, 2018. ISBN: 978-3-527-34191-7.
[6] D. Akinwande “Two-dimensional materials: printing functional atomic layers” Nat. Nanotechnol. 12, 287 (2017).
[7] E. Piatti, A. Arbab et al. “Charge transport mechanisms in inkjet-printed thin-film transistors based on two-dimensional materials” Nature Electronics 4, 893 – 905 (2021).
[8] T. Wang et al. “Ultrafast carrier and lattice cooling in Ti2CTx MXene thin films” Nano Lett. 24, 16333 (2024)
