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Quasi-radial growth of metal tube on si nanowires template.

Huang Z, Liu L, Geyer N - Nanoscale Res Lett (2011)

Bottom Line: The quasi-radial growth of metal enables the fabrication of thickness-defined metal tube via changing deposition time.Inner-diameter-defined metal tube is achieved by choosing Si nanowires with desired diameter as a template.Metal tubes with inner diameters ranging from 1 μm to sub-50 nm are fabricated.

View Article: PubMed Central - HTML - PubMed

Affiliation: Functional Molecular Materials Centre, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, P, R, China. zphuang@ujs.edu.cn.

ABSTRACT
It is reported in this article that Si nanowires can be employed as a positive template for the controllable electrochemical deposition of noble metal tube. The deposited tube exhibits good crystallinity. Scanning electron microscope and transmission electron microscope characterizations are conducted to reveal the growth process of metal tube, showing that the metal tube grows quasi-radially on the wall of Si nanowire. The quasi-radial growth of metal enables the fabrication of thickness-defined metal tube via changing deposition time. Inner-diameter-defined metal tube is achieved by choosing Si nanowires with desired diameter as a template. Metal tubes with inner diameters ranging from 1 μm to sub-50 nm are fabricated.

No MeSH data available.


Related in: MedlinePlus

SEM images of Si nanowires deposited with Au for 5 min. (a) Low magnification image showing the morphologies of the whole wires. (b-d) High magnification SEM images showing in detail the morphologies of the top, middle, and root part of a single nanowire, respectively. The rectangles in (a) enclose the regions which are magnified into (b-d).
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Figure 4: SEM images of Si nanowires deposited with Au for 5 min. (a) Low magnification image showing the morphologies of the whole wires. (b-d) High magnification SEM images showing in detail the morphologies of the top, middle, and root part of a single nanowire, respectively. The rectangles in (a) enclose the regions which are magnified into (b-d).

Mentions: Si nanowire templates were fabricated by template-based metal-assisted chemical etching [21,23,24] of Si substrates (ρ: 1-10 Ωcm, n-type substrates for samples are shown in Figures 1, 2, 3, 4, 5, 6, 7a and 7b, and p-type substrates for samples are shown in Figure 7c). Except the one used in Figure 7, the Si nanowire templates used in this article were fabricated by the metal-assisted chemical etching combined with nanosphere lithography. In brief, polystyrene (PS) spheres were assembled into monolayer hexagonal array onto a Si substrate. Then the diameter of PS spheres was reduced by reactive ion etching. Afterward, a silver (Ag) mesh with ordered pores was obtained by depositing Ag onto the Si substrate with arrays of diameter-reduced PS spheres [21]. Subsequently, the Si substrates loaded with Ag mesh were etched in an etchant composed of HF, H2O2, and de-ionized water for a certain time. Afterward, the Ag mesh was removed by a 3-min concentrated HNO3 treatment, and the Si substrate with Si nanowires was rinsed with copious amount of de-ionized water. For the Si nanowires templates used in Figure 7, AAO membrane was used as template instead of PS sphere for the deposition of Ag mesh, as reported by Huang et al. [23]. The diameter of Si nanowires was defined by the diameter of the pre-defined mask, and the length of Si nanowires was determined by the etching time.


Quasi-radial growth of metal tube on si nanowires template.

Huang Z, Liu L, Geyer N - Nanoscale Res Lett (2011)

SEM images of Si nanowires deposited with Au for 5 min. (a) Low magnification image showing the morphologies of the whole wires. (b-d) High magnification SEM images showing in detail the morphologies of the top, middle, and root part of a single nanowire, respectively. The rectangles in (a) enclose the regions which are magnified into (b-d).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211217&req=5

Figure 4: SEM images of Si nanowires deposited with Au for 5 min. (a) Low magnification image showing the morphologies of the whole wires. (b-d) High magnification SEM images showing in detail the morphologies of the top, middle, and root part of a single nanowire, respectively. The rectangles in (a) enclose the regions which are magnified into (b-d).
Mentions: Si nanowire templates were fabricated by template-based metal-assisted chemical etching [21,23,24] of Si substrates (ρ: 1-10 Ωcm, n-type substrates for samples are shown in Figures 1, 2, 3, 4, 5, 6, 7a and 7b, and p-type substrates for samples are shown in Figure 7c). Except the one used in Figure 7, the Si nanowire templates used in this article were fabricated by the metal-assisted chemical etching combined with nanosphere lithography. In brief, polystyrene (PS) spheres were assembled into monolayer hexagonal array onto a Si substrate. Then the diameter of PS spheres was reduced by reactive ion etching. Afterward, a silver (Ag) mesh with ordered pores was obtained by depositing Ag onto the Si substrate with arrays of diameter-reduced PS spheres [21]. Subsequently, the Si substrates loaded with Ag mesh were etched in an etchant composed of HF, H2O2, and de-ionized water for a certain time. Afterward, the Ag mesh was removed by a 3-min concentrated HNO3 treatment, and the Si substrate with Si nanowires was rinsed with copious amount of de-ionized water. For the Si nanowires templates used in Figure 7, AAO membrane was used as template instead of PS sphere for the deposition of Ag mesh, as reported by Huang et al. [23]. The diameter of Si nanowires was defined by the diameter of the pre-defined mask, and the length of Si nanowires was determined by the etching time.

Bottom Line: The quasi-radial growth of metal enables the fabrication of thickness-defined metal tube via changing deposition time.Inner-diameter-defined metal tube is achieved by choosing Si nanowires with desired diameter as a template.Metal tubes with inner diameters ranging from 1 μm to sub-50 nm are fabricated.

View Article: PubMed Central - HTML - PubMed

Affiliation: Functional Molecular Materials Centre, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, P, R, China. zphuang@ujs.edu.cn.

ABSTRACT
It is reported in this article that Si nanowires can be employed as a positive template for the controllable electrochemical deposition of noble metal tube. The deposited tube exhibits good crystallinity. Scanning electron microscope and transmission electron microscope characterizations are conducted to reveal the growth process of metal tube, showing that the metal tube grows quasi-radially on the wall of Si nanowire. The quasi-radial growth of metal enables the fabrication of thickness-defined metal tube via changing deposition time. Inner-diameter-defined metal tube is achieved by choosing Si nanowires with desired diameter as a template. Metal tubes with inner diameters ranging from 1 μm to sub-50 nm are fabricated.

No MeSH data available.


Related in: MedlinePlus