4.8 Article

Highly Precise Multifunctional Thermal Management-Based Flexible Sensing Sheets

Journal

ACS NANO
Volume 13, Issue 12, Pages 14348-14356

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b07805

Keywords

thermal management; flexible sensors; wearable electronics; thermal flow sensor array; internet of things

Funding

  1. JST PRESTO [JPMJPR17J5]
  2. JSPS KAKENHI grants [JP17H04926, JP18H05472]

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Elaborate manipulation of heat transfer renders proper operation of diverse thermal-related technologies. However, accurate implementation of thermal-based or transduction sensing on a thin flexible film over unusual surfaces remains challenging. Herein, efficient thermal management realizes highly accurate flexible multifunctional sensor sheets using a low thermal conductive medium as a thermal barrier. An approximately 50-fold enhancement in the thermal sensing accuracy, which is nearly independent of the changes in the external surroundings, is achieved. Such rational control of heat convection and conduction allows to not only dynamically monitor air flow, but also sight the large-scale air flow distribution on curved surfaces using a flexible thermal flow sensor array. Additionally, accurate wearable skin temperature monitoring independent of the sudden surrounding variations is achieved. This work addresses the formidable challenge of untethered heat transfer induced imprecise thermal related sensing, which universally exists in skin-inspired Internet of Things (IoT) applications.

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