Novel chain-like cobalt–nickel microstructures fabricated by a CTAB-assisted hydrothermal method

CoNi microchains were synthesized via a hydrothermal method.No external magnetic field was used.CTAB served as growth directing agent.Significantly enhanced coercivity of 223.3 Oe.

CoNi chains with length up to a few hundred micrometers have been synthesized via a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal approach. The product was characterized by means of XRD, SEM, TEM, and VSM techniques. The effects of CTAB amount and reaction time on the resulting CoNi were investigated by a series of assistant experiments. It was found that the CTAB molecule played an important role for the formation of such novel CoNi microchains. These chains assembled by CoNi particles possessed face-centered cubic (fcc) structure. The magnetic property investigation of the obtained CoNi chains illustrated that they display ferromagnetic behavior with significantly enhanced coercivity of 223.3 Oe.

Novel chain-like CoNi alloy microstructures have been successfully prepared via a hydrothermal route at 200 °C with the assistance of cetyltrimethylammonium bromide (CTAB) as a growth directing agent, and the sample possessed ferromagnetic behavior and significantly enhanced coercivity of 223.3 Oe compared to those of previously reported CoNi nanostructures.Figure optionsDownload as PowerPoint slide