Novel magnetic properties of CoTe nanorods and diversified CoTe₂ nanostructures obtained at different NaOH concentrations

Abstract

CoTe and CoTe2 nanorods with average diameter of 100 nm were synthesized by a simple hydrothermal process, and different CoTe2 nanostructures were obtained by changing the NaOH concentration. CoTe nanorods exhibit weak ferromagnetism while CoTe2 nanorods present paramagnetic behavior. Different magnetic behaviors occur in the other CoTe2 nanostructures due to Na+ entrance into CoTe2 crystals. A first-principles study on Na-doped CoTe2 confirms the magnetic characteristics.

One-Pot Hydrothermal Synthesis of Nickel Cobalt Telluride Nanorods for Hybrid Energy Storage Systems

“…The saturation magnetization ( M s ) and the coercive field ( H c ) increase with the decrease in the temperature from 300 to 100 K (Table S1 of the Supporting Information). Lei et al discussed that CoTe and CoTe 2 nanorods reveal a weak ferromagnetic and paramagnetic behavior at a low temperature (10 K) . NiTe x shows different magnetic behaviors; NiTe (paramagnetic) and NiTe 2 (paramagnetic to diamagnetic) at low (10 K) and high (300 K) temperatures have been reported by Lei et al…”

“…Lei et al discussed that CoTe and CoTe 2 nanorods reveal a weak ferromagnetic and paramagnetic behavior at a low temperature (10 K). 52 NiTe x shows different magnetic behaviors; NiTe (paramagnetic) and NiTe 2 (paramagnetic to diamagnetic) at low (10 K) and high (300 K) temperatures have been reported by Lei et al 53 Panels d−f of Figure 4 show the temperature-dependent magnetic susceptibility at 500 Oe for NCT-1, NCT-2, and NCT-3, revealing the paramagnetic behavior at 20 K. Both the zero-field-cooled (ZFC) and field-cooled (FC) curves have a concave nature without any magnetic phase transition. For nickel and cobalt at the same concentration, irreversibility is observed between FC and ZFC.…”

Thickness-Controlled Synthesis of CoX2 (X = S, Se, and Te) Single Crystalline 2D Layers with Linear Magnetoresistance and High Conductivity

“…38,39 Wang and co-workers found tunable magnetic properties of CoTe 2 treated with different concentrations of NaOH. 40 However, high-quality ultrathin-layered CoX 2 (X = S and Se) has not been synthesized yet. Moreover, CoX 2 nanosheets with well-controlled thickness down to the monolayer are desirable to explore the layer-dependent magnetic properties of these materials.…”

“…For example, a nonlayered material CoS 2 is reported as ferromagnetic metal with the Curie temperature T C of 124 K, and CoSe 2 with the pyrite-type structure is regarded as the controversial Pauli paramagnet or the antiferromagnet. − Some initial efforts have also been made on CoTe 2 in two dimensions recently. Duan and co-workers reported the layer-controlled growth of CoTe 2 and CoSe and studied the electric properties of the resulting nanosheets. , Wang and co-workers found tunable magnetic properties of CoTe 2 treated with different concentrations of NaOH . However, high-quality ultrathin-layered CoX 2 (X = S and Se) has not been synthesized yet.…”

Recent advances of metal telluride anodes for high-performance lithium/sodium–ion batteries

“…MTs formed by the alloying reaction between tellurium and transition metal elements, such as Fe, Co, Ni, Cu, Zn, Mo have also been synthesized in the form of different nanostructures by hydrothermal and solvothermal methods. Lei et al 91 synthesized uniform CoTe 2 nanorods (Fig. 11C) with a diameter of 100 nm and length of 2 μm by hydrothermal method at 180 °C for 20 h without any surfactant and mineralizer, and by using ascorbic acid as the reducing agent.…”