期刊
NATIONAL SCIENCE REVIEW
卷 6, 期 4, 页码 758-766出版社
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwz034
关键词
Marangoni flow; temperature gradient; large-scale material patterning; flexible device; contact line
资金
- Ministry of Science and Technology of China [2016YFA0201904]
- National Natural Science Foundation of China [21631002, U1632119, 51622601, 91334110]
Patterned materials on substrates are of great importance for a wide variety of applications. In solution-based approaches to material patterning, fluidic flow is inevitable. Here we demonstrate not only the importance of fluidic behavior but also the methodology of engineering the flow pattern to guide the material crystallization and assembly. We show by both experiment and simulation that substrate heating, which is generally used to accelerate evaporation, produces irregular complex vortexes. Instead, a top-heating-bottom-cooling (THBC) set-up offers an inverse temperature gradient and results in a single Marangoni vortex, which is desired for ordered nanomaterial patterning near the contact line. We then realize the fabrication of large-scale patterns of iodide perovskite crystals on different substrates under THBC conditions. We further demonstrate that harnessing the flow behavior is a general strategy with great feasibility to pattern various functional materials ranging from inorganic, organic, hybrid to biological categories on different substrates, presenting great potential for practical applications.
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