HWAHAK KONGHAK Vol. 40, No. 3, June, 2002, pp. 377-381

*†**

*

(2002 3 18 , 2002 4 16 )

Template Synthesis of Silica Nanostructures

Hyo-Joong Kim*†, Chung-Heop Kwak*, Tae-Soo Suh* and Dong-Soo Suhr

Department of Materials Engineering, Chungnam National University, Daejeon 305-764, Korea*Advanced Materials Division, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea

(Received 18 March 2002; accepted 16 April 2002)

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Abstract − A novel technique for the synthesis of silica nanostructures with needle-like template, hydroxyapatite, having

nanometer diameter was investigated in this study. The synthetic method consisted of the following main steps: the preparation

of nanoprecursor(silica-coated templates), the calcination of nanoprecursor and the removal of templates. The analysis resultsof scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photo-

electron spectroscopy(XPS) for nanoprecursor revealed that silica particles were deposited onto the surface of templates. Fur-

ther examinations(curve-fitting processing) of the asymmetrical broadening of O 1s peaks in the XPS spectra indicate the

presence of multiple oxygen species on the surface. Energy dispersive X-ray spectroscopy(EDS) result confirmed that nano-

structures were composed of silicon and oxygen. The diameters of the synthesized nanostructures, mainly in the range of 50-

200 nm, correspond to the diameters of the templates. The results confirm that the proposed technique in this study can be uti-

lized as a new method to fabricate the nanostructures.

Key words: Template, Sol-Gel, Hydroxyapatite, Silica, Nanostructures

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40 3 2002 6

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Fig. 2. SEM micrograph and XRD pattern of templates(HAp).

Fig. 3. FT-IR spectrum of samples: (a) templates; (b) nanoprecursors;(c) silica nanostructures.

Fig. 4. XPS survey spectrum of samples: (a) nanoprecursors; (b) tem-plates.

Fig. 5. Curve-fitting of the oxygen XPS spectrum for nanoprecursors.

Fig. 6. SEM micrograph for nanoprecursors.

HWAHAK KONGHAK Vol. 40, No. 3, June, 2002

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HWAHAK KONGHAK Vol. 40, No. 3, June, 2002