A solvothermal route to wurtzite ZnSe nanoparticles

Abstract

Zinc powder reacts with equivalent elemental selenium in solvent ethylenediamine at 120 °C for 6 h to form a complex, which is converted to ZnSe nanoparticles by pyrolysis or protonization. X-ray diffraction results suggest that the as-formed products have wurtzite structure. Transmission electron microscopy observation show that particles with spherical and laminar morphology were produced by pyrolysis and protonization, respectively. The formation of ZnSe nanoparticles is also investigated by infrared and thermal analysis.

Strategies for the Scalable Synthesis of Quantum Dots and Related Nanodimensional Materials

“…Qian and coworkers [66] have reported wurtzite ZnSe nanoparticles with sizes in the 18 nm range starting from the elements in ethylenediamine (T ¼ 120 C, t ¼ 6 h.) This reaction yields a complex with the formula ZnSe(en) where en is ethylenediamine. Seshadri has used toluene as the solvent in a neat preparation of CdSe from cadmium stearate and Se powder [67,68], tetralin (tetrahydronaphthalene) was added as a reducing agent.…”

Solvothermal Synthesis of Non‐Oxide Nanomaterials

“…A mono-dentate ligand, n-butylamine, was found to be a shape controller for nanorods of CdS and MSe (M ¼ Zn, Cd or Pb) [101]. Similarly, the precursor of ZnE(en) 0:5 (E ¼ S, Se) could also form in en which then is converted to ZnSe nanoparticles via pyrolysis in solvothermal conditions [102]. The coordinating ability of the solvent was found to play an important role in the nucleation and growth of nanocrystallites [103].…”

Synthesis of laminar wurtzite CdSe nanocrystals from CdO at room temperature

“…Traditionally, CdSe is prepared through solid-state reaction between elemental cadmium and selenium at high temperature [3]. Recently, many wet chemical methods have been applied to synthesize CdSe, and the most noticeable two methods are colloidal method (Alivisatos's and Peng's group) [2,[4][5][6] and hydrothermal/solvothermal technique (Qian's group) [7][8][9][10][11][12][13][14]. Peng et al [6] synthesized high quality nanocrystals using CdO as precursor.…”

“…Many researchers has reported CdSeC 2 -N 2 H 8 complex formed before decomposing into CdSe in ethylenediamine, which exhibited a strong peak near 2h ¼ 10°in the XRD pattern [12,16]. It has been reported that the complex is stable in neutral aqueous solutions but decomposes in dilute acid solutions [11]. So the precursors can be decomposed into CdSe nanocrystals by two methods: solvothermal treatment and protonization in dilute acid solution.…”

“…When the mixed solvents were replaced either with only ethylenediamine or hydrazine hydrate, the reaction could not proceed. As reported, the ethylenediamine molecule acts as strong bidentate ligands to form relative stable Cd 2þ complexes [8][9][10][11][12][13][14][15][16], which are expected to coordinate with selenium ions. In the present work, selenium is reduced into Se 2À by hydrazine with the help of small quantity of water.…”