Abstract
II-VI 족 무기 화합물 반도체인 ZnO는 폭 넓은 응용분야 때문에 많은 관심을 받고 있다. ZnO는 넓은 밴드갭(3.37 eV)과 큰 excitation binding energy(60 meV)를 가지고 있고 광학특성, 반도체, 압전특성, 자성, 항균성, 광촉매 등 여러 분야에 응용 가능한 물질로 알려져 있다. 특히 광촉매 분야에 적용할 때 재수득의 문제를 위해 자성을 갖는 물질과 core-shell 구조를 이루는 연구가 활발히 진행 되고 있다. 본 연구에서, magnetic core-shell ZnFe<sub>2</sub>O<sub>4</sub>@ZnO@SiO<sub>2</sub> nanoparticles(NPs)는 3단계 과정을 통해 성공적으로 합성하였다. 합성된 물질들의 구조적 특성을 확인하기 위해 X-ray diffraction(XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy(FT-IR)을 사용하였다. ZnFe<sub>2</sub>O<sub>4</sub> spinel 구조와 ZnO wurtzite 구조는 XRD를 사용하여 확인되었고, 전구체의 농도별 분석을 통해 ZnO 생성 비율을 확인 하였다. 합성된 물질들은SEM을 통하여 표면의 변화를 확인하였다. SiO<sub>2</sub>층의 형성과 ZnFe<sub>2</sub>O<sub>4</sub>@ZnO@SiO<sub>2</sub> NPs의 합성은 FT-IR을 통해 Fe-O, Zn-O 및 Si-O-Si 결합을 확인하였다. 합성된 물질들의 자기적 성질은 Vibrating sample magnetometer(VSM)을 사용 하여 분석하였다. ZnO층과 SiO<sub>2</sub> 층의 형성의 결과는 자성의 증가와 감소로 확인하였다. 합성된 ZnFe<sub>2</sub>O<sub>4</sub>@ZnO@SiO<sub>2</sub> NPs의 광촉매 효과는 오염물질 대신 methylene blue(MB)를 사용하여 UV 조사 하에 암실에서 실험하였다. ZnO, II-VI group inorganic compound semi-conductor, has been receiving much attention due to its wide applications in various fields. Since the ZnO has 3.37 eV of a wide band gap and 60 meV of big excitation binding energy, it is well-known material for various uses such the optical property, a semi-conductor, magnetism, antibiosis, photocatalyst, etc. When applied in the field of photocatalyst, many research studies have been actively conducted regarding magnetic materials and the core-shell structure to take on the need of recycling used materials. In this paper, magnetic core-shell ZnFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub> nanoparticles (NPs) have been successfully synthesized through three steps. In order to analyze the structural characteristics of the synthesized substances, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR) were used. The spinel structure of ZnFe<sub>2</sub>O<sub>4</sub> and the wurtzite structure of ZnO were confirmed by XRD, and ZnO production rate was confirmed through the analysis of different concentrations of the precursors. The surface change of the synthesized materials was confirmed by SEM. The formation of SiO<sub>2</sub> layer and the synthesis of ZnFe<sub>2</sub>O<sub>4</sub>@ZnO@SiO<sub>2</sub> NPs were finally verified through the bond of Fe-O, Zn-O and Si-O-Si by FT-IR. The magnetic property of the synthesized materials was analyzed through the vibrating sample magnetometer (VSM). The increase and decrease in the magnetism were respectively confirmed by the results of the formed ZnO and SiO<sub>2</sub> layer. The photocatalysis effect of the synthesized ZnFe<sub>2</sub>O<sub>4</sub> @ZnO@SiO<sub>2</sub> NPs was experimented in a black box (dark room) using methylene blue (MB) under UV irradiation.
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