Fluoropolymer-Coated Nanometer-Thick Cu Mesh Film for Robust and Hydrophobic Transparent Heater
2020
To
develop more effective optoelectronic devices with a transparent
heater, it is necessary to investigate the droplet evaporation characteristics
and wettability control on the heater surface. An optically transparent
and hydrophobic amorphous fluoropolymer, Cytop, is spin-coated onto
a nano-thick copper (Cu) micromesh-based transparent conductor to
evaluate its performance for a high-durable transparent heater (a
transmittance of 81.6% at 550 nm, a sheet resistance of 5 Ω
sq–1). As the result, the thermal and chemical stabilities
of the pure Cu micromesh-based transparent heater with the ∼80
nm thick Cytop layer improve without performance degradation. The
evaporation time of water droplets on the surface of the hydrophobic
transparent heater is noticeably delayed (about 60–130%) because
the average evaporation flux of the droplet on the surface of the
hydrophobic transparent heater is lower than those on the hydrophilic
heater surfaces. In addition, unlike when the heater surface is hydrophilic,
there is no coffee-ring effect when the heater surface is hydrophobic
due to the recirculating Marangoni flow within the droplet. Further,
the hydrophobic transparent heater surface exhibits excellent icephobic
and antifrost properties. The results will be helpful for the further
development of practical transparent heaters including self-cleaning
smart windows, transparent actuators, transparent chemical and biological
sensors, and transparent heating sources.
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