Study of precursor-solution purity for high-quality yttrium–barium–copper-oxide superconducting thin film
Study of precursor-solution purity for high-quality yttrium–barium–copper-oxide superconducting thin film
复制标题
DOI：
10.1007/s10971-018-4624-z
复制
发表时间：
2018-05
影响因子：
2.5
通讯作者：
S. S. Wang-S.;Z. L. Zhang;M. H. Li;M. J. Li;L. Gao;B. Wei;B. Cao
中科院分区：
文献类型：
--
作者：
S. S. Wang-S.;Z. L. Zhang;M. H. Li;M. J. Li;L. Gao;B. Wei;B. Cao
三氟乙酸-金属-有机沉积(TFA-MOD)是制备大面积高质量YBCO超导薄膜的有效方法。化学反应和提纯是TFA-MOD法制备前驱体溶液的关键。本研究通过红外光谱对前驱体溶液的制备过程进行了系统考察，并通过傅里叶变换红外光谱(FTIR)对各红外光谱进行了测定，以判断可能发生的副反应。结果表明，有机官能团在室温(20 ± 2℃)下无副作用。而净化工艺可以去除多余的水、酸等。前驱体溶液的纯度随着蒸馏的进行而增加。当经过三次提纯的溶液3的光谱中Cf_3-−与C-−-OH吸收峰的相对高度比达到0.664，C-−-F与C-−-OH吸收峰的相对比为0.418时，可以得到表面均匀的YBCO薄膜。其转变起始温度约为90.9 K，临界电流密度(Jc)为2.32 mA/cm~2(77 K，0 T)，超导薄膜的生长强烈地沿c轴取向。此外，还发现蒸馏去除了多余的水、醋酸等小分子，并决定了YBCO薄膜的质量。对于这一性能，超导薄膜已经成功地应用于滤光片的制造。因此，这种方法本质上是研究前驱体溶液中杂质含量以形成质量良好的超导薄膜的有效方法。上图是文章图表的总结，分为四大步骤。本研究对前驱体溶液的制备过程进行了系统的红外光谱检测，并通过傅里叶变换红外光谱(FTIR)对各红外光谱进行了测定，以判断可能发生的副反应。并用X射线衍射仪、扫描电子显微镜、低温扫描仪和四探针法对薄膜的微观结构和超导电性进行了表征。最后，通过这种研究方法，将超导薄膜的这种性能成功地应用于滤光片的制作。
Trifluoroacetic acid-metal-organic deposition (TFA-MOD) is an effective method to prepare high-quality yttrium–barium–copper oxide (YBCO) superconducting thin films with a large area. Chemical reactions and purification are the keys to the preparation of the precursor solution in the TFA-MOD method. In this study, the process of preparing the precursor solution was examined by the infrared spectra systematically, and each infrared spectrum was determined by Fourier-transform-infrared spectroscopy (FTIR) to judge the possible side reactions. The results show that organic functional groups have no side effects at room temperature (20 ± 2°C). And the purification process can remove excess water, acid, and so on. The purity of the precursor solution would increase with distillation. When the relative height ratio of CF3−and the C−OH absorption peak in the spectra of solution 3, which has been purified three times, reaches 0.664, and the relative ratio of C−F and the C−OH absorption peak is 0.418, a YBCO thin film can be obtained with a perfectly uniform surface. Its transition-onset temperature is approximately 90.9 K, the value of critical current density (Jc) is 2.32 mA/cm2(77 K, 0 T), and the growth of the superconducting film is strongly oriented to thec-axis. In addition, it was found that distillation removes excess water, acetic acid, and other small molecules, and determines the quality of YBCO thin films. For this performance, a superconducting film has been successfully applied to filter the fabrication. Therefore, this method is essentially an effective method to study the content of impurities in the precursor solution in order to form a superconducting film with good quality.The picture above is a summary of the article charts, divided into four major steps. In this study, the process of preparing the precursor solution was examined by infrared spectra systematically, and each infrared spectrum was determined by Fourier transform infrared spectroscopy (FTIR) to judge possible side reactions. And the microstructure and superconductivity of thin film have been characterized by XRD, SEM, CRYO SCAN equipment and four-probe method. Finally, this performance of superconducting film haves been successfully applied to the filter fabrication through this research method.