Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 9, Pages 8672-8678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01404
Keywords
transparent heater; hydrophobic surface; durability; droplet evaporation; coffee-ring effect
Funding
- Center for Integrated Smart Sensors - Ministry of Science and ICT as Global Frontier Project [CISS-2020M3A6A6036233]
- Technology innovation Program - Ministry of Trade, Industry AMP
- Energy (MOTIE, Korea) [20006408]
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science and ICT of the Korea government [NRF-2017M1A2A2087325]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20006408] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 Omega sq(-1)). As the result, the thermal and chemical stabilities of the pure Cu micromesh-based transparent heater with the similar to 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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