Unprecedented switching endurance affords for high-resolution surface temperature mapping using a spin-crossover film

Karl Ridier, Alin-Ciprian Bas, Yuteng Zhang, Lucie Routaboul, Lionel Salmon, Gábor Molnár (), Christian Bergaud and Azzedine Bousseksou ()
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Karl Ridier: CNRS UPR 8241
Alin-Ciprian Bas: CNRS UPR 8241
Yuteng Zhang: CNRS UPR 8241
Lucie Routaboul: CNRS UPR 8241
Lionel Salmon: CNRS UPR 8241
Gábor Molnár: CNRS UPR 8241
Christian Bergaud: CNRS UPR 8001
Azzedine Bousseksou: CNRS UPR 8241

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Temperature measurement at the nanoscale is of paramount importance in the fields of nanoscience and nanotechnology, and calls for the development of versatile, high-resolution thermometry techniques. Here, the working principle and quantitative performance of a cost-effective nanothermometer are experimentally demonstrated, using a molecular spin-crossover thin film as a surface temperature sensor, probed optically. We evidence highly reliable thermometric performance (diffraction-limited sub-µm spatial, µs temporal and 1 °C thermal resolution), which stems to a large extent from the unprecedented quality of the vacuum-deposited thin films of the molecular complex [Fe(HB(1,2,4-triazol-1-yl)3)2] used in this work, in terms of fabrication and switching endurance (>107 thermal cycles in ambient air). As such, our results not only afford for a fully-fledged nanothermometry method, but set also a forthcoming stage in spin-crossover research, which has awaited, since the visionary ideas of Olivier Kahn in the 90’s, a real-world, technological application.

Date: 2020
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DOI: 10.1038/s41467-020-17362-7

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