Journal
NANO ENERGY
Volume 85, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105978
Keywords
Hierarchical structure; Wrinkle; Superhydrophobic surface; Triboelectric nanogenerator; Cough sensor
Categories
Funding
- Center for Advanced MetaMaterials (CAMM) - Ministry of Science, ICT and Future Planning, Korea, through the Global Frontier Project [CAMM] [2014M3A6B3063707]
- Basic Research Program of KIMM (Korea Institute of Machinery and Materials) [NK230C]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1A2C3008742]
- National Research Council of Science & Technology (NST), Republic of Korea [NK230C] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel morphology-controllable wrinkled micro/nano hierarchical structure was developed by integrating micropatterns, nanopatterns, and wrinkles, providing unlimited design diversity and improving device performance. The structure was used as a superhydrophobic triboelectric nanogenerator with superior hydrophobicity and enhanced triboelectric effect.
Hierarchical structures allow one to improve device performance by exploiting the synergistic effects of micro/nano multiscale components. However, the structural complexity of hierarchical structures places limits on their fabrication and applications. Herein, a novel morphology-controllable wrinkled micro/nano hierarchical structure (WHS) was developed by integrating micropatterns, nanopatterns, and wrinkles on a single substrate to overcome these limitations. Each structure could be individually controlled, which offers unlimited design diversity. The produced WHS was used as a superhydrophobic triboelectric nanogenerator. Compared to a nanogenerator with on a film structure, the WHS-based nanogenerator showed a superior contact angle of 152.5 degrees(,) which is indicative of high hydrophobicity, and an enhanced (by 608%) triboelectric effect, which was ascribed to the highly rough surface of the WHS. The WHS-based nanogenerator was used to fabricate a selfpowered and water-repellent cough detection sensor with an entirely superhydrophobic structure and stable superior sensing performance during repeated water spraying.
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