Customized MFM probes with high lateral resolution

• Óscar Iglesias-Freire,
• Miriam Jaafar,
• Eider Berganza and
• Agustina Asenjo

Beilstein J. Nanotechnol. 2016, 7, 1068–1074, doi:10.3762/bjnano.7.100

• influence exerted on an array of single-domain nickel nanowires embedded in an Al2O3 membrane was used to calibrate the stray field of the MFM tip– we can estimate the value of the stray field emerging from the custom-coated tips and compare it to the stray field of commercial tips. The axial field

Self-assembly mechanism of Ni nanowires prepared with an external magnetic field

• Xiaoyu Li,
• Hu Wang,
• Kenan Xie,
• Qin Long,
• Xuefei Lai and
• Li Liao

Beilstein J. Nanotechnol. 2015, 6, 2123–2128, doi:10.3762/bjnano.6.217

• Xiaoyu Li Hu Wang Kenan Xie Qin Long Xuefei Lai Li Liao School of Chemical Engineering, Sichuan University, Chengdu 610065, PR China 10.3762/bjnano.6.217 Abstract Nickel nanowires with a mean diameter of about 95 nm and lengths of up to 26 μm were prepared by a chemical reduction method in

• ] synthesized nickel nanowires with a diameter of 250 nm and a length of several microns via a chemical reduction method with an external magnetic field of 1.4 T. Liu et al. [18] prepared Ni nanowires with a diameter of 50 nm via a hydrazine reduction route under external magnetic field assistance. However, it

• , nickel nanowires cannot be formed if the diameter of the nickel nanoparticles does not reach a critical size. Experimental All chemicals were of analytical grade without further purification. All reaction solutions were located between two parallel neodymium magnets (60 × 30 mm2) separated 150 mm apart

The Kirkendall effect and nanoscience: hollow nanospheres and nanotubes

• Abdel-Aziz El Mel,
• Ryusuke Nakamura and
• Carla Bittencourt

Beilstein J. Nanotechnol. 2015, 6, 1348–1361, doi:10.3762/bjnano.6.139

• precisely controlled. For NiO nanotubes created by thermal oxidation of nickel nanowires, a systematic study was reported where both approaches were investigated (Figure 11) [66]. Through these studies, it was made clear that to obtain nanotubes with a uniform wall thickness, the diffusion rate of vacancies

• must be much lower than their injection rate [65][66][67]. When these conditions are not maintained, bamboo-like nanotubes may be formed [65][66][67]. This was first reported by Nakamura et al. while investigating the oxidation of nickel nanowires [65]. So far, this irregularity was only observed when

• oxidizing nickel nanowires. Although ramping (Figure 11a) and rapid (Figure 11b) thermal annealing approaches were investigated, the nanotubes were found to show the same bamboo-like structure at the final stage of the conversion process [66]. The formation of bamboo-like structures was attributed to the

Preparation of Ni/Cu composite nanowires

• Hu Wang,
• Xiaoyu Li,
• Ming Li,
• Kenan Xie and
• Li Liao

Beilstein J. Nanotechnol. 2015, 6, 1268–1271, doi:10.3762/bjnano.6.130

• nickel nanowires were prepared through chemical reduction in solution under a magnetic field. Secondly, copper was reduced on the surface of the nickel nanowires, during which Ni/Cu composite nanowires with an average length of 80 µm and diameter of about 200 nm were synthesized. The products were

• characterized by XRD, SEM and TEM. The method has notable advantages: It is template-free, inexpensive, easy-to-operate, and it only needs a short reaction time, which makes it suitable for large-scale preparation. Keywords: copper nanoparticles; nickel nanowires; Ni/Cu composite nanowires; Introduction In

• surface of nickel nanowires, named Ni/Cu composite nanowires, was developed for the first time. The synthetic process consisted of two steps. Firstly, pure nickel nanowires were prepared in solution without template by applying a weak external magnetic field. Secondly, the obtained nickel nanowires were

Highly ordered ultralong magnetic nanowires wrapped in stacked graphene layers

• Abdel-Aziz El Mel,
• Jean-Luc Duvail,
• Eric Gautron,
• Wei Xu,
• Chang-Hwan Choi,
• Benoit Angleraud,
• Agnès Granier and
• Pierre-Yves Tessier

Beilstein J. Nanotechnol. 2012, 3, 846–851, doi:10.3762/bjnano.3.95

• (also known as metal-filled carbon nanotubes). Carbon-containing nickel nanowires are first grown on a nanograted surface by magnetron sputtering. Then, a post-annealing treatment favors the metal-catalyzed crystallization of carbon into stacked graphene layers rolled around the nickel cores. The

• the quality of the nickel nanowires after annealing attributed to a decrease of the roughness of the nickel surface and to a reduction of the defect density. This new type of graphene–ferromagnetic-metal nanowire appears to be an interesting building block for spintronic applications. Keywords

• and efficient method to prepare an array of highly ordered coaxial nickel/graphene-stacks core–shell nanowires with a length up to 1 cm. The process involves the deposition of nickel nanowires containing a low amount of carbon (3 atom %) by a hybrid sputtering technique [26] on a patterned silicon