Controllable Fabrication of Multifunctional Micro-thermocouples for Temperature Detection inside Single Suspended Droplets

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Microdropletshave recently emerged as an exciting technologicalplatform for wide applications. In this work, we developed a controllablefabrication approach to novel tungsten–platinum micro-thermocouplesthat function not only as a sensitive temperature sensor but alsoas a flexible suspender for individual microdroplet studies. The controllablefabrication hinges on the formation of tungsten tip apex nodes tomake junctions with platinum, which was achieved through a uniquecombinational strategy, involving gradient coating with a completeinsulating layer and subsequent targeted removal by tip electroporation.Benefiting from its coaxial structure, microspherical contact nodeend, hydrophobic surface, and thermoelectric performance, the as-fabricatedmicro-thermocouple was successfully employed for the microdropletsuspension and in situ temperature detection throughout the dropletevaporation cycle. It was observed that the temperature inside thesuspended microdroplets was lower than that of the external environment,and there existed temperature discontinuity during droplet evaporation.By integrating the capabilities of temperature monitoring and dropletmanipulation into a single micro-thermocouple, this work demonstratesits versatility and promising applications in expanded sensing forsingle microdroplets and other microsystems.

[ACS] Controllable Fabrication of Multifunctional Micro-thermocouples for Temperature Detection inside Single Suspended Droplets

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[ACS] Controllable Fabrication of Multifunctional Micro-thermocouples for Temperature Detection inside Single Suspended Droplets