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Shahzad, Aasim,Kim, Woo-Sik,Yu, Taekyung The Royal Society of Chemistry 2016 Dalton transactions Vol.45 No.22
<P>This paper describes a simple and fast aqueous-phase route to the synthesis of Ag/AgCl hybrid nanostructures. These hybrid nanostructures were synthesized by reduction of AgCl nanoparticles with controlled shapes prepared by reacting Ag+ with Cl-in the presence of polyethyleneimine (PEI) in an aqueous-phase. We could easily control the morphology and composition of the nanostructures by varying the experimental conditions, including the reaction temperature and the amount of the reducing agent. The as-synthesized Ag/AgCl hybrid nanostructures exhibited enhanced photocatalytic activity and stability during the degradation of methyl orange under visible light irradiation because of their strong surface plasmon resonance (SPR) effect.</P>
Shahzad, Aasim,Chung, Minsub,Yu, Taekyung,Kim, Woo-Sik Wiley (John WileySons) 2015 Chemistry - An Asian Journal Vol.10 No.11
<P>A simple and fast synthetic route to ultra-highly concentrated silver nanoparticles with long-term stability by reducing AgNO3 with ascorbic acid in the presence of polyethyleneimine (PEI) as a stabilizer in an aqueous phase is reported. The concentration of silver precursor was as high as 2000???mm (200???g of Ag nanoparticle per liter of water) and the reaction time was less than 10???min. The resulting silver nanoparticles show long-term stability after two months of storage at room temperature without any signs of particle aggregation or precipitation in an aqueous phase. The successful ligand exchange of PEI-stabilized silver nanoparticles to polyethylene glycol (PEG) and polyvinylpyrrolidone (PVP) without particle aggregation is also demonstrated. In addition, the catalytic activities of silver nanoparticles stabilized by various stabilizers prepared by the ligand exchange method was investigated. The PEI-stabilized silver nanoparticles exhibited a higher stability than those of PEG- and PVP-stabilized silver nanoparticles in the diffusion-controlled catalytic reduction of 4-nitrophenol to 4-aminophenol by NaBH4 .</P>
Simple and easy aqueous synthesis of highly aniotropic nanoplates future bio-application
임지수,방석호,( Aasim Shahzad ),정지영 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
We have demonstrated a simple, fast, and room temperature aqueous-phase synthesis of Ag nanoplates with controllable sizes from 1 to 17 mm via reduction of PEI-stabilized AgCl nanoparticles using H2O2 in the presence of PVP. Compared with typical synthetic methods for Ag nanoplates, the present synthesis has three strong advantages; short reaction time, low reaction temperature, and formation of large-sized Ag nanoplates. The synthesis is conducted at room temperature and only 10 min is needed to obtain the Ag nanoplates with highly crystalline nature. Furthermore, the synthesized Ag nanoplates have large side dimension of around 17 mm. Additionally, our Ag nanoplates showed less cytotoxicity compared to Ag nanoparticle. This modality may lead to further bio-application based on Ag nanoplates.