Silver nanodisks (AgNDs) have been successfully synthesized
by
using ferric chloride as an auxiliary agent in the presence of polyvinylpyrrolidone
and
N
,
N
-dimethylformamide as both
a solvent and a reducing agent. The mass ratio of reactants, temperature,
and time were demonstrated to be the key factors determining the morphology
of the product, and the conversion of Fe
3+
/Fe
2+
ions played an important role in increasing the ratio of silver
nanosheets (AgNSs). As the reaction prolonged, the etching effect
of Cl
–
ions on the tips of AgNSs became more and
more obvious, which made the obtained typical polygonal AgNSs turn
into AgNDs eventually. In addition, the prepared AgNDs exhibited a
considerable catalytic activity in the reduction of 4-nitrophenol.
The presence of 5-chloro-2-thienylmagnesium bromide is beneficial for the in situ formation of smaller AgBr and AgCl particles step by step and the final growth of ultrafine Ag NWs with an average diameter of ∼15 nm and an aspect ratio of over 1000.
Precise control of the morphology of nanocrystals is vital in various fields, especially for the conductive materials and catalysts. In this work, ethanolamine (ETA)-induced synthesis of sesame cake-like Cu/Ag core−shell nanosheets (Cu/AgNSs) has been reported for the first time. It is found that the ETA molecules may play a "clip-on" role in the formation of sesame cake-like Cu/AgNSs. In the system, the lone-pair electrons of oxygen and nitrogen in ETA can not only bind to the vacant orbital of Cu element, thus promoting ETA to preferentially adsorb on the surface of copper nanosheets (CuNSs), but also make Ag + ions tend to form silver−amine complexes, eventually resulting in the gentle reduction of Ag + ions on the surface of CuNSs and the final formation of Ag shell layer. Moreover, the prepared sesame cake-like Cu/AgNSs exhibited excellent catalytic activity (turnover frequency, TOF = 12.05 min −1 ) in the reduction of p-nitrophenol to p-aminophenol when compared with the most reported silver-based catalysts.
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