Flexible, transparent electrodes based on AgNW/ZnO nanocomposites for localized heating of lab-on-chip devices David Muñoz-Rojas 1 , T. Papanastasiou 1 , A. Sekkat 1 , V. H. Nguyen 2 , M. Le Goff 3 , C. Jiménez 1 , F. Bruckert 1 , D. Bellet 1 1 Laboratoire des Materiaux et du Genie Physique, France, 2 Faculty of Materials Science and Engineering, Phenikaa University, Vietnam, 3 Univ. Grenoble Alpes, LIPhy, CNRS, France In situ biological observations require stable, accurate and local temperature control of specimen. Several heating elements are coupled with microfluidic systems, but few of them are transparent to visible light and therefore compatible with microscopic observation. Traditional transparent electrodes such as indium tin oxide, still suffer from high fabrication cost and brittleness, which is not fully compatible to emerging microfluidic devices. Here, we propose a lightweight, low-cost, flexible transparent heater [1] based on percolating silver nanowire networks, protected with a transparent zinc oxide film, [2,3] for the in situ monitoring of biological experiments. Using the fluorescence of dyes bound to double-stranded DNA to monitor its temperature in situ , we demonstrate that such nanocomposites allow rapid and reproducible heating under low applied voltage. [4] Furthermore, selective heating is achieved in different zones of the same microchannel or for adjacent with a single transparent heater and bias. References 1. Papanastasiou, D. T.; Schultheiss, A.; Muñoz-Rojas, D.; Celle, C.; Carella, A.; Simonato, J.-P.; Bellet, D. Transparent Heaters: A Review. Advanced Functional Materials 2020, 30 (21), 1910225. https://doi.org/10.1002/adfm.201910225. 2. Sannicolo, T.; Lagrange, M.; Cabos, A.; Celle, C.; Simonato, J.-P.; Bellet, D. Metallic Nanowire-Based Transparent Electrodes for Next Generation Flexible Devices: A Review. Small 2016, 12 (44), 6052–6075. https://doi.org/10.1002/ smll.201602581. 3. Khan, A.; Nguyen, V. H.; Muñoz-Rojas, D.; Aghazadehchors, S.; Jiménez, C.; Nguyen, N. D.; Bellet, D. Stability Enhancement of Silver Nanowire Networks with Conformal ZnO Coatings Deposited by Atmospheric Pressure Spatial Atomic Layer Deposition. ACS Applied Materials & Interfaces 2018, 10 (22), 19208–19217. https://doi.org/10.1021/ acsami.8b03079. 4. Dorina T. Papanastasiou, Abderrahime Sekkat, Viet H. Nguyen, Carmen Jiménez, David Muñoz-Rojas, Franz Bruckert*, Daniel Bellet*. Stable flexible transparent electrodes for localized heating of lab-on-a-chip devices, Advanced Materials Technologies, Adv. Mater. Tech. 2023 , 8(1), 2200563.
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