Liu Guixia

Fabrication of Eu(III) complex doped nanofibrous membranes and their oxygen-sensing properties

In this paper, we report the synthesis, characterization, and photophysical properties of Eu(TTA)₃ECIP, where TTA=2-thenoyltrifluoroacetonate, and ECIP=1-ethyl-2-(N-ethyl-carbazole-yl-4-)imidazo[4,5-f]1,10-phenanthroline. Its elementary application for oxygen-sensing application is also investigated by doping it into a polymer matrix of polystyrene (PS). Experimental data suggest that the 2.5 wt% doped Eu(TTA)₃ECIP/PS nanofibrous membrane exhibits a high sensitivity of 3.4 towards oxygen with a good linear relationship of R² = 0.9962. In addition, the 2.5 wt% doped Eu(TTA)₃ECIP/PS nanofibrous membrane owns a quick response of 8s towards oxygen, along with its excellent atmosphere insensitivity and photobleaching resistance. All these results suggest that both Eu(TTA)₃ECIP and Eu(TTA)₃CIP/PS system are promising candidates for oxygen-sensing optical sensors.

Synthesis and Characterization of Terbium-Trimesic Acid Luminescent Complex in Polyvinylpyrrolidone Matrix

Tb(III)-trimesic acid (TMA) luminescent complexes were synthesized in the polyvinylpyrrolidone (PVP) matrix. The elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and fourier-transform infrared spectroscopy (FT-IR) indicated that its chemical constitution is PVP/Tb(MTA)·4H2O. The XRD patterns showed that the complex is a new kind of crystal. The TEM image indicates that the complex is rod shaped. The rod diameter is about 200 nm, and the length ranges from hundred of nanometer to a few micrometers. In addition, the dispersity is better. TG-DTA curves indicate that the complex is thermally stable before 463 °C. Photoluminescence analysis indicates that the complex emits Tb3+ characteristic luminescence under ultraviolet excitation.

Fabrication and Characterization of Gd2O3:Eu3+Luminescent Nanofibres via Electrospinning

采用静电纺丝技术制备了PVA/[Gd(NO3)3+Eu(NO3)3]复合纳米纤维,并将其进行热处理,得到Gd 2 O 3 :Eu 3+ 发光纳米纤维。X射线衍射分析表明,复合纤维为无定型,Gd 2 O 3 :Eu 3+ 发光纳米纤维属于体心立方晶系,空间群为Ia3。扫描电子显微镜(SEM)分析表明,复合纳米纤维的平均直径约为200 nm,经过800 ℃焙烧后,获得了直径约50 nm的Gd 2 O 3 :Eu 3+ 发光纳米纤维。差热热重分析表明,温度高于600 ℃时,复合纳米纤维中水份、有机物和硝酸盐分解挥发完毕,样品不再失重,总失重率为71.9%。傅里叶转换红外光谱(FTIR)分析表明,复合纳米纤维的红外光谱与纯聚乙烯醇的红外光谱基本一致,600 ℃以上生成了Gd 2 O 3 :Eu 3+ 发光纳米纤维。荧光光谱分析表明,在251 nm紫外光激发下,Gd 2 O 3 :Eu 3+ 发光纳米纤维发射出Eu 3+ 离子特征的609 nm明亮红光。讨论了Gd 2 O 3 :Eu 3+ 发光纳米纤维的形成机理,该技术可以推广用于制备其他稀土氧化物发光纳米纤维。