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Total Integration of the Sample Injection, Microdroplet Reaction, Phase Separation, Real‐Time Optical Detection, and Recovery of Diverse Silver–Gold Bimetallic Nanoalloys in a Continuous Process
Author(s) -
Bui Hoang Khang,
Kim Ki Yoon,
Kim Hyeonjin,
Ahn JaePyoung,
Yu Taekyung,
Seo Tae Seok
Publication year - 2021
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.202000244
Subject(s) - bimetallic strip , microreactor , microfluidics , absorbance , materials science , chloroauric acid , microsystem , nanoparticle , nanotechnology , aqueous solution , chemical engineering , analytical chemistry (journal) , chemistry , catalysis , colloidal gold , chromatography , organic chemistry , engineering
Microfluidic droplet generators have garnered great attention due to the uniformity, high‐throughput capability, and facile experimental setup. To maximize the potentials of droplet technology as a chemical/biological nanoliter‐scale reactor, the downstream processes such as separation of the aqueous and oil phase, real‐time monitoring of the products formed in droplets, and the final product recovery from the droplets is necessary. In this study, the droplet is utilized as a chemical reactor to synthesize a variety of Ag and Au bimetallic nanoalloys in a fully integrated microsystem including sample injection, a T‐junction droplet generator, droplet reaction, water–oil phase separation, real‐time UV–vis absorbance detection, and product recovery. The flow rate of the Ag nanoparticle (NP) solution and the HAuCl 4 solution was tuned to generate different molar ratios of Ag and Au components. The in‐line UV–vis absorbance spectrometer displays a peak shift of the Ag/Au bimetallic alloys depending on the molar ratio of Ag/Au in the continuous process, enabling to judge the kind of the Ag/Au alloys in situ and collect a variety of Ag/Au nanoalloys. Thus, the desired nanomaterials can be obtained with minimal trial and error, saving time and cost.