Abstract
Solution processed NiSe2 nanorods were synthesized by a modified colloidal synthesis technique, by chemical reaction of TOPSe and nickel acetate at 150°C. The rods exist as an oleic acid ligand stabilized solution, with oleic acid acting as a capping group. Structural characterization by X‐ray diffraction and transmission electron microscopy indicates that the particles are rod‐like shaped crystals with a high and relatively constant aspect ratio (30 : 1). TEM shows that the width and the length of the nanorods are in the range 10–20 nm and 300–350 nm, respectively. XRD indicates that the nanorods are pure and well crystallized. The size of nanorods based on the Debye‐Scherrer effect, was 150 nm, the average value of length and width. They display thermal stability over prolonged heating times (<100 hours) at 150°C, for which the average particle size is roughly constant. After about 100 hours of heating time there is an onset and growth of micron sized cubes and concurrent decomposition of NiSe2 to Ni and NiSe at 150°C.
Highlights
Nanoparticles and nanowires, typically containing from hundreds to tens of thousands of atoms, high surface/volume ratios, size-dependent properties, and the possibility of arranging them in micro-assemblies, have remained the focus of intensive research due to their numerous applications in diverse fields [1,2,3]
In this report we demonstrate that the reaction of nickel acetate stabilized with oleic acid and further reacted with trioctylphosphine selenide (TOPSe) which can be used to produce nanostructured NiSe2
The rods exist as an oleic acid ligand stabilized solution in the presence of oleic acid as a capping group
Summary
Nanoparticles and nanowires, typically containing from hundreds to tens of thousands of atoms, high surface/volume ratios, size-dependent properties, and the possibility of arranging them in micro- (and nano)assemblies, have remained the focus of intensive research due to their numerous applications in diverse fields [1,2,3]. Nanoscale chalcogenides have attracted considerable attention due to their remarkable properties and application prospects [4]. Various interesting magnetic properties and crystallographic studies have been reported on transition metal dichalcogenides MX2 (M = Fe, Co, and Ni; X = S, Se, and Te) with a pyrite structure, which is cubic, of space group Th6 (Pa3). As typical representatives of the great number of transition metal chalcogenides, the selenides have been investigated extensively. Various methods have been developed to prepare transition metal selenides [5]
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