Fabrication and Magnetic Properties of N-type Porous Silicon/Nickel Microtubes Composite

doi:10.15541/jim20150596

Abstract

Abstract:

The highly ordered n-type porous Si template was prepared via electrochemical etching and back side illumination method. Pores of the Si template had squarish shape with side length of about 2 μm and depth of about 50 μm, respectively. Three growth stages, nucleation, self-assembly, and stable growth were observed by scanning electron microscope (SEM) during the formation process of the porous n-silicon template. Subsequently, nickel microtubes arrays were synthesized by electro-deposition. And the formation mechanism of the microtubes was also investigated. The content and particle size of Ni particles embedded in n-type porous Si templates increase with the increase of deposition time. Ni microtubes are formed by gathering the Ni particles over pore sidewall, which is different from that of insulative AAO template. In addition, the crystal structure of Ni microtubes keeps fcc-Ni in the whole growth process. In particular, due to the fewer defects and grain boundaries of Ni microtubes than that of Ni particles, the coercivity value of Ni microtubes is smaller. Moreover, the magnetic anisotropy of Ni microtubes is mainly contributed to the strong demagnetization energy.

Key words: n-type porous silicon, electrochemical deposition, Ni microtubes, magnetic anisotropy

CLC Number:

TQ153

ZHOU Hui, HAN Man-Gui, TANG Zhong-Kai, WU Yan-Hui. Fabrication and Magnetic Properties of N-type Porous Silicon/Nickel Microtubes Composite[J]. Journal of Inorganic Materials, 2016, 31(8): 855-859.

Figures/Tables 4

Fig. 1 Typical SEM images of porous silicon template(a) Cross section image of porous silicon; The front side of (b) region Ⅰ, (c) region Ⅱ, (d) region Ⅲ in the Fig. 1(a)

Fig. 2 SEM images of the cross section and front side of Ni particles and microtubes with different electrodeposition time(a) 5 min; (b) 20 min; (c) 40 min; (d) 90 min. The insert in each image is the front side of the template

Fig. 3 XRD patterns of Ni particles and microtubes deposited for different time(a) 5 min; (b) 20 min; (c) 40 min; (d) 90 min; (e) n-type porous silicon template

Fig. 4 Magnetic hysteresis loops of Ni particles and microtubes when the external field is parallel or perpendicular to the pore axis(a)Magnetic hysteresis loops of Ni particles (parallel); (b) Magnetic hysteresis loops of Ni microtube (parallel); (c) Magnetic hysteresis loops of Ni microtube (perpendicular)

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