Stable Flexible Transparent Electrodes for Localized Heating of Lab‐on‐a‐Chip Devices
Résumé
In situ biological observations require stable, accurate and local temperature control of 19 specimen. Several heating elements are coupled with microfluidic systems, but few of them are 20 transparent to visible light and therefore compatible with microscopic observation. Traditional 21 transparent electrodes such as indium tin oxide, still suffer from high fabrication cost and 22 brittleness, which is not fully compatible to emerging microfluidic devices. Here, we propose 23 a lightweight, low-cost, flexible transparent heater based on percolating silver nanowire 24 networks, protected with a transparent zinc oxide film, for the in situ monitoring of biological 25 experiments. Using the fluorescence of dyes bound to double-stranded DNA to monitor its 26 temperature in situ, we demonstrate that such nanocomposites allow rapid and reproducible 27 heating under low applied voltage. Furthermore, selective heating is achieved in different zones 28 of the same microchannel or for adjacent microchannels of the chip heating at different 29 temperatures, with a single transparent heater and bias.
Origine : Fichiers produits par l'(les) auteur(s)