Synthesis, characterization and optical properties of Mg(OH)2 micro-/nanostructure and its conversion to MgO
Synthesis, characterization and optical properties of Mg(OH)2 micro-/nanostructure and its conversion to MgO
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DOI：
10.1016/j.ceramint.2009.05.035
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发表时间：
2009-12-01
影响因子：
5.2
通讯作者：
Wang, D. Z.
中科院分区：
文献类型：
--
作者：
Kumari, Latha;Li, W. Z.;Wang, D. Z.
采用一步水热法合成了氢氧化镁(Mg(OH)(2))微结构和窄结构。表面形貌分析表明，在不同的合成条件下，会形成不同形状和尺寸的微米和纳米结构。X-射线衍射仪和透射电子显微镜的结构分析表明，合成的材料为六方晶系氢氧化镁。由紫外-可见吸收光谱测得氢氧化镁纳米盘的光学带隙为5.7 eV。在室温下的氢氧化镁纳米盘的光致发光(PL)谱中观察到一个最大强度在400 nm左右的宽发光带，其紫光发射可归因于材料中的电离氧空位。此外，通过在450℃下焙烧，镁(OH)(2)被转化为氧化镁。对氧化镁纳米盘的光学研究表明，该纳米盘具有3.43 eV的光学带隙和在紫外区的宽带荧光发射。氢氧化镁和氧化镁纳米结构具有宽禁带和短波长的发光特性，可以作为一种较好的发光材料应用于光子领域。(C)2009年爱思唯尔有限公司和Techna Group S.r.l.版权所有。
Magnesium hydroxide (Mg(OH)(2)) micro- and narrostructures have been synthesized by a single step hydrothermal route. Surface morphology analysis reveals the formation of micro- and nanostructures with varying shape and size at different synthesis conditions. Structural investigations by X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirm that the synthesized material is Mg(OH)(2) with hexagonal crystal structure. An optical band gap of 5.7 eV is determined for Mg(OH)(2) nanodisks from the UV-vis absorption spectrum. A broad emission band with maximum intensity at around 400 nm is observed in the photoluminescence (PL) spectra of Mg(OH)(2) nanodisks at room temperature depicting the violet emission, which can be attributed to the ionized oxygen vacancies in the material. Furthermore, Mg(OH)(2) has been converted to MgO by calcination at 450 degrees C. Optical studies of the MgO nanodisks have shown an optical band gap of 3.43 eV and a broadband PL emission in the UV region. Mg(OH)(2) and MgO nanostructures with wide-band gap and short-wavelength luminescence emission can serve as a better luminescent material for photonic applications. (c) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.