Hydrothermal formation of magnetic Ni–Cu alloy nanocrystallites at low temperatures

Abstract

Magnetic Ni–Cu alloy nanocrystallites with a diameter of about 12 nm have been prepared by a hydrothermal approach with polymer–surfactant complex association at 80 °C. XRD, TEM and ICP-AES were employed to characterize alloy nanocrystallites. The magnetic properties of alloy nanocrystallites were measured using a vibrating sample magnetometer (VSM). The influences of polymer–micelle association, temperature and concentration of micelles on the formation of alloy are discussed. Polymer–micelle association provides a way for Ni and Cu to be reduced simultaneously and then occupy the Cu lattice to form Ni–Cu alloy nanocrystallites.

Hydrothermal technology for nanotechnology

“…Such an approach can be extended to the hydrothermal preparation of nanobelts of several other transitional metals and their alloys. Niu et al have prepared NieCu alloy nanocrystallites at low temperatures under hydrothermal conditions [28]. These nanoscale metallic alloys like CuNi, AgPd, AuPt can be applied in small scale electronic devices.…”

Synthesis and characterization of Bi nanorods and superconducting NiBi particles

“…Such nanoscale metals and alloys can be made by reducing metal salt solutions [8][9][10]. Hydrothermal synthesis routes lead to 1D nanostructures due to the dissolution-recrystallization (solution-solid) process established for binary rare earth oxides and metals [11,12].…”

A new chemical route to synthesize Cu–Ni alloy nanostructured particles

“…The spectrum of the solid obtained after the precursor decomposition in N 2 at 280 • C (spectrum b) shows a notable decrease in the band intensity in 3000-3500 cm −1 region. The band at 1600 cm −1 can be attributed to the carboxylate groups bound to metallic ions [14]. Besides, a band at 1380 cm −1 is observed indicating that the nitrate ions have not been completely eliminated at this temperature.…”

“…The Cu-Ni alloy synthesis techniques mostly used in several studies include electrochemical methods [6,[9][10][11], reduction techniques in liquid phase [12][13][14][15][16], oxides mixture obtention and reduction techniques [8,17] and physical methods [18,19]. The Monel alloy formation process using the joint reduction of Cu and Ni oxides was studied in a previous work [17].…”