Abstract
Ni nano-micro structures have been synthesized via a solution reduction route in the presence of ethylenediamine (EDA) under strong alkaline conditions. The phase composition, morphology, and microstructure of the resulting products are investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The presence of EDA plays an important role in the formation of Ni nano-micro structures, and microflowers or microspheres assembled from nanosized horns can be produced by changing the amount of EDA. The size of Ni nano-micro structures is dependent on the NaOH concentration, and long chains assembled from Ni nano-micro structured microspheres can be obtained by reducing the amount of NaOH solution used. The role of both EDA and NaOH in the reduction of Ni (II) to Ni, as well as in the growth of Ni nano-micro structures, has been discussed, and a possible formation mechanism of these Ni nano-micro structures has been proposed based on the experimental results.
Highlights
Amines, a class of organic compounds, which contain an amino group with a pair of lone electrons on the nitrogen atom, are widely used for mediating the growth of a variety of nanostructures, including nanocrystals, nanosheets, nanorods, and nanowires [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
We present a study on the EDA-mediated synthesis of Ni nano-micro structures, namely microflowers or microspheres assembled from nanosized horns, via a solution reduction route in concentrated alkaline solution
In our early studies [11,29], we have found that the addition of EDA in concentrated alkaline solution changes the morphology of as-formed Cu products [11,29], and influences the reduction of Cu(II) to Cu [11]
Summary
A class of organic compounds, which contain an amino group with a pair of lone electrons on the nitrogen atom, are widely used for mediating the growth of a variety of nanostructures, including nanocrystals, nanosheets, nanorods, and nanowires [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. As the simplest diamine after hydrazine, for example, ethylenediamine (EDA) can be used as a capping agent in the synthesis of ultrasmall CeO2 particles [5], PbS nanosheets [6], Mn3 O4 nano-octahedrons [7], and CdS multipods [8], as a coordination template in the synthesis of CdX (X = S, Se, Te) nanorods [9] and ZnS nanowires [10], and as both capping agent and complexing agent in the growth of Cu nanowires [11,12]. Much work has been done on the EDA-mediated growth of nanostructures, there are few efforts on the use of EDA in the synthesis of nano-micro structured materials
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