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Large-Scale, Long-Range-Ordered Patterning of Nanocrystals via Capillary-Bridge Manipulation
Jiangang Feng1,2, Qian Song3,2, Bo Zhang4
1Key Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|October 24, 2017
Summary
Deterministic nanoparticle assembly using capillary-bridge manipulation enables precise, large-scale fabrication of ordered superlattices. This method enhances material properties and allows for novel functional devices.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Deterministic assembly of nanoparticles is crucial for property-by-design fabrication.
- Conventional solution processes face limitations in spatial precision and long-range order due to uncontrollable dewetting dynamics.
- Colloidal nanocrystals offer advantages for scalable, low-cost fabrication.
Purpose of the Study:
- To demonstrate a capillary-bridge manipulation method for deterministic patterning of nanocrystal superlattices.
- To achieve long-range order and programmable patterns in nanocrystal assembly.
- To explore the coassembly of nanocrystal superlattices with organic molecules for enhanced functionalities.
Main Methods:
- Utilizing micropillars with programmable geometry to control capillary bridges.
- Directing dewetting dynamics of nanocrystal inks for precise patterning.
- Fabricating various superlattice structures including 1D, circle, square, and complex arrays.
- Coassembling nanocrystal superlattices with azobenzene molecules.
Main Results:
- Successful deterministic patterning of long-range-ordered nanocrystal superlattices.
- Fabrication of diverse superlattice structures (1D, circle, square, hexagon, pentagram, cross arrays).
- Demonstrated improved ferroelectric polarization in ordered superlattices compared to glassy films.
- Achieved switchable ferroelectric polarization through coassembly with azobenzene.
Conclusions:
- The capillary-bridge manipulation method provides a versatile platform for patterning nanocrystal superlattices.
- This technique enables the fabrication of advanced materials with enhanced properties, such as improved ferroelectricity.
- The coassembly approach opens possibilities for creating functional microdevices for multiferroics, electronics, and photonics.
