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Morphologic evolution of Au nanocrystals grown in ionic liquid by plasma reduction
Yongbing Xie1, Zhehao Wei, Chang-jun Liu
1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. ybxie@mail.ipe.ac.cn
Journal of Colloid and Interface Science
|February 29, 2012
Summary
Researchers explored gold (Au) nanocrystal growth in ionic liquids using plasma reduction. They observed shape evolution from nanoparticles to nanorods, influenced by surfactant concentration and a proposed polymer-assisted attachment mechanism.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Controlling nanocrystal morphology is crucial for tailoring material properties.
- Ionic liquids offer unique environments for nanomaterial synthesis.
- Plasma reduction provides a non-equilibrium method for nanocrystal formation.
Purpose of the Study:
- To investigate the shape-controlled growth of gold (Au) nanocrystals in ionic liquid.
- To elucidate the mechanism behind the observed morphologic evolution.
- To explore the role of surfactant concentration in the synthesis process.
Main Methods:
- Glow discharge plasma reduction was employed for Au nanocrystal synthesis.
- 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) served as the ionic liquid medium.
- Poly(vinyl pyrrolidone) (PVP) was used as a surfactant.
- Systematic microscopic analysis and control experiments were conducted.
Main Results:
- Au nanocrystals exhibited shape evolution from faceted nanoparticles to peanut-like aggregates, and finally to worm-like nanorods and nanowires with increasing growth time.
- The observed morphologic evolution was dependent on the concentration of the PVP surfactant.
- A polymer-assisted oriented attachment mechanism was proposed to explain the growth process.
Conclusions:
- Ionic liquids can be effectively utilized for shape-controlled synthesis of Au nanocrystals.
- The study proposes a novel polymer-assisted oriented attachment mechanism for nanocrystal growth.
- Findings have significant implications for employing ionic liquids in advanced nanomaterial fabrication.
