Journal
SMALL
Volume 18, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202202906
Keywords
energy conversion; graphene; laser scribing; patterns; wettability
Categories
Funding
- National Natural Science Foundation of China [U1909220, 52003282, 52003283]
- Zhejiang Provincial Natural Science Foundation of China [LR20E030001]
- Natural Science Foundation of Ningbo City [202003N4360]
- Chinese Academy of Sciences [KFZD-SW-439]
- National Ten Thousand Talent Program for Young Top-notch Talents
- Ten Thousand Talent Program for Young Top-notch Talents of Zhejiang Province
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This study demonstrates the fabrication of patterned graphene surfaces capable of energy conversion in different forms using a laser scribing strategy, showing superior performance in wettability and energy conversion.
To achieve clean and high-efficiency utilization of renewable energy, functional surfaces with controllable and patternable wettability are becoming a fast-growing research focus. In this work, a laser scribing strategy to fabricate patterned graphene surfaces that are capable of energy conversion in different forms is demonstrated. Using the laser raster-scanning and vector-scanning modes, two distinct surface structures are constructed on polybenzoxazine substrate, yielding a superhydrophilic (LSHL) surface and superhydrophobic (LSHB) surface, respectively. Of particular note is that the unique hierarchical structure of LSHB surface has endowed it with quite a robust superwetting behaviors. Further profiting from the flexibility of the processing method, wettability patterns with spatially resolved LSHL and LSHB regions are designed, achieving the conversion of surface energy to liquid kinetic energy. This also offers a tractable approach to fabricate wettability-engineered devices that enable the directional, pumpless transport of water by capillary pressure gradient and the selective surface cooling via jet impingement. In addition, the LSHB surface demonstrates the high conversion of electric-to-thermal energy (222 degrees C cm(2) W-1) and light-to-thermal energy (88%). Overall, the material system and processing method present a promising step forward to developing easy-fabricated graphene surfaces with spatially controlled wettability for efficient energy utilization and conversion.
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