期刊
ACS NANO
卷 15, 期 10, 页码 16839-16850出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c07278
关键词
low melting point; post-transition metals; phase separation; polymer; gas interaction
类别
资金
- Australian Research Council (ARC) [FL180100053]
- Australian Research Council [FL180100053] Funding Source: Australian Research Council
This study demonstrates the compositional change of EGaIn nanoalloys triggered by PDA coating, resulting in core-shell nanostructures. The PDA shell continuously depletes Ga3+ from the EGaIn nanoalloys, transforming them into non-eutectic systems and ultimately solidifying In.
Low melting point eutectic systems, such as the eutectic gallium-indium (EGaIn) alloy, offer great potential in the domain of nanometallurgy; however, many of their interfacial behaviors remain to be explored. Here, a compositional change of EGaIn nanoalloys triggered by polydopamine (PDA) coating is demonstrated. Incorporating PDA on the surface of EGaIn nanoalloys renders core-shell nanostructures that accompany Ga-In phase separation within the nanoalloys. The PDA shell keeps depleting the Ga3+ from the EGaIn nanoalloys when the synthesis proceeds, leading to a Ga3+ coordinated PDA coating and a smaller nanoalloy. During this process, the eutectic nanoalloys turn into non-eutectic systems that ultimately result in the solidification of In when Ga is fully depleted. The reaction of Ga3+-coordinated PDA-coated nanoalloys with nitrogen dioxide gas is presented as an example for demonstrating the functionality of such hybrid composites. The concept of phase-separating systems, with polymeric reservoirs, may lead to tailored materials and can be explored on a variety of post-transition metals.
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