稀土钕掺杂双配体温敏漆的制备及光学性质

Preparation and optical properties of rare earth neodymium doped temperature sensitive paint with double ligands

以稀土氧化物、2-噻吩甲酰基三氟丙酮(TTA)、邻菲罗啉盐酸盐(phen)为原料制备了稀土钕离子(Nd^(3+))掺杂的Eu(TTA)3phen探针分子。以聚甲基丙烯酸甲酯(PMMA)为基质,以Eu_(0.5)Nd_(0.5)(TTA)3phen为探针分子,利用自由基聚合作用制备了Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA温敏漆。采用红外光谱和扫描电镜对探针分子的结构和形貌进行了表征;采用紫外可见吸收光谱和荧光光谱对探针分子和温敏漆的光学性质进行了研究。结果表明,Nd^(3+)的掺杂未影响Eu(TTA)3phen结构;Nd^(3+)和Eu^(3+)的最佳物质的量比为0.5∶0.5;探针分子在波长617 nm附近具有最强荧光发射,且Nd^(3+)对Eu(TTA)3phen发光具有协同作用;20~80℃范围内,Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA最强荧光发射强度随着温度的升高逐渐减弱,说明温敏漆具有良好的温度猝灭性。此外,Nd^(3+)的掺杂能够提高温敏漆的荧光强度和测温灵敏度。Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA温敏漆测温技术为复杂动力学实验中温度测量提供了新方法。

The rare earth ion neodymium(Nd^(3+))doped Eu_(0.5)Nd_(0.5)(TTA)3phen probe molecule was prepared using rare earth oxide,2-thenoyltrifluoroacetone(TTA)and 1,10-phenanthroline monohydrochloride monohydrate(phen)as raw material.The Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA temperature sensitive paint was prepared by radical polymerization using polymethyl methacrylate(PMMA)as the matrix and Eu_(0.5)Nd_(0.5)(TTA)3phen as the probe molecule.The structure and morphology of the probe molecules were characterized by FTIR and SEM,and the optical properties of the probe molecules and temperature sensitive paint were investigated by UV-Vis and PL.The results show that the doping of Nd^(3+)does not affect the structure of Eu(TTA)3phen.The optimal ratio of Nd^(3+)and Eu^(3+)is 0.5:0.5;the probe molecule has the strongest fluorescence emission around 617 nm,and Nd^(3+)has synergistic effect on the emission of Eu(TTA)3phen.The strongest fluorescence emission intensity of Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA gradually decreases with the temperature increase in the range of 20~80℃,indicating that temperature sensitive paint has good temperature quenching.Moreover,the doping of Nd^(3+)can improve the fluorescence intensity and temperature measurement sensitivity of the temperature sensitive paint.The Eu_(0.5)Nd_(0.5)(TTA)3phen/PMMA temperature sensitive paint technique provides a new method for temperature measurement in complex kinetic experiments.