Scheelite-type MWO4 (M = Ca, Sr, and Ba) nanophosphors: Facile synthesis, structural characterization, photoluminescence, and photocatalytic properties
Scheelite-type MWO4 (M = Ca, Sr, and Ba) nanophosphors: Facile synthesis, structural characterization, photoluminescence, and photocatalytic properties
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DOI：
10.1016/j.materresbull.2014.09.096
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发表时间：
2015-01-01
影响因子：
5.4
通讯作者：
Nagabhushana, H.
中科院分区：
文献类型：
--
作者：
Shivakumara, C.;Saraf, Rohit;Nagabhushana, H.
采用沉淀法合成了白钨矿结构的MWO4(M=Ca，Sr，Ba)纳米荧光粉。所有化合物均为四方晶系，空间群为141/a(第88号)。Scherrer‘s和TEM结果表明，微晶的平均尺寸在32~55 nm之间。Fe-SEM显示了球形(CaWO4)、花束(SrWO4)和鱼状(BaWO4)的形貌。荧光光谱表明，在紫外光激发下，436(CaWO4)、440(SrWO4)和433 nm(BaWO4)有较宽的发射峰。计算的MWO4纳米荧光粉的CIE颜色坐标与商业BAM和国家电视系统委员会的蓝色荧光粉接近。考察了MWO4在紫外光照射下降解亚甲基蓝染料的光催化活性。在pH为3的条件下，BaWO4纳米催化剂在60min内对染料的降解率为100%。在中性和酸性条件下，光催化活性大小顺序为BaWO4>；CaWO4>；SrWO4。(C)2014爱思唯尔有限公司。保留所有权利。
Scheelite-type MWO4 (M = Ca, Sr, and Ba) nanophosphors were synthesized by the precipitation method. All compounds crystallized in the tetragonal structure with space group 141/a (No. 88). Scherrer's and TEM results revealed that the average crystallite size varies from 32 to 55 nm. FE-SEM illustrate the spherical (CaWO4), bouquet (SrWO4), and fish (BaWO4) like morphologies. PL spectra indicate the broad emission peak maximum at 436 (CaWO4), 440 (SrWO4), and 433 nm (BaWO4) under UV excitation. The calculated CIE color coordinates of MWO4 nanophosphors are close to the commercial BAM and National Television System Committee blue phosphor. The photocatalytic activities of MWO4 were investigated for the degradation of methylene blue dye under UV illumination. At pH 3, BaWO4 nanocatalyst showed 100% dye degradation within 60 min. The photocatalytic activity was in the decreasing order of BaWO4> CaWO4>SrWO4 under both neutral and acidic conditions. (C) 2014 Elsevier Ltd. All rights reserved.