Journal
NANO LETTERS
Volume 21, Issue 17, Pages 7159-7165Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01789
Keywords
Roll-up technology; 2D metals; Nanosheets; Configurational transition; Finite element simulations
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Funding
- Research Grants Council (RGC) through the General Research Fund (GRF) [CityU 11200719, CityU11213118, CityU 11209317]
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The study presents a novel method for synthesizing self-rolled metallic nanostructures through hydrogel surface buckling, achieving exfoliation and self-rolling at a rate faster than traditional methods. The research also reveals a scrollhelix-scroll transition through twisting of the self-rolled nanosheets, supported by thermodynamics.
The rapid development of state-of-the-art nanotechnology is driven by the emerging novel nanofabrication methods, such as self-rolling of 2D materials or nanosheets. Nonetheless, the traditional chemical etching-based roll-up technologies suffer from a low fabrication efficiency and generally produce only scroll-like structures. In this work, we develop a versatile, ultrafast, and etching-free method to synthesize self-rolled metallic nanostructures through hydrogel surface buckling enabled exfoliation, which enables rapid exfoliation and self-rolling of metallic nanosheets at a rate about 1 to 2 orders of magnitude faster than other methods. Furthermore, we observe a scrollhelix-scroll transition through the twisting of the self-rolled nanosheets. Through extensive finite element simulations and experiments, we reveal the thermodynamics underpinning these configurational transitions.
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