Event Details

Join Dr Felice Torrisi of the Molecular Science Research Hub (Department of Chemistry, Imperial College London) for a talk on electronic and heat transport in nanostructured films of two-dimensional materials for high-performance chemical sensing and heat management. Also on Teams.

Title: Tailoring the electronic and heat transport in nanostructured films of two-dimensional materials for high-performance chemical sensing and heat management

Abstract: Chemical sensing and heat management both represent primary technologies to enable remote healthcare provision in wearable devices, which is highly important in a post-pandemic society. Graphene and related 2D materials (GRMs) hold a great potential for wearable electronics for their novel electrical and thermal properties. In particular low temperature production and deposition of nanostructured GRM films (fig.1a) from GRM-based solutions is extremely attractive for printed flexible and wearable electronics. [1, 2] Electronic inks from 2D materials with different electronic properties have been developed 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[3, 4]. Single-layer hexagonal boron nitride (h-BN) is a wide-bandgap 2D semiconductor with excellent phonon transport [5] which is a promising polymer filler for thermally conducting pastes. [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]

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]

References

[1] Torrisi, F. Nano Today 23, 73 (2018)

[2] F. Torrisi & J. N. Coleman Nature Nanotechnol. 9, 10, 738, (2014)

[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] Q. Cai et al. “High thermal conductivity of high-quality monolayer boron nitride and its thermal expansion” Science Advances 5, 6 (2019)

[6] C. Yao et al. “Thermally Conductive Hexagonal Boron Nitride/Polymer Composites for Efficient Heat Transport” Advanced Functional Materials 2405235 (2024)

[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 (202

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