基于FAIMS谱图峰位置的离子迁移率非线性函数解析

离子迁移率的非线性函数反映了物质本身的微观碰撞特性,是FAIMS技术实现离子分离检测的基础。现有的离子迁移率非线性函数求解方法多是近似求解,存在较大误差。该工作提出了一种基于半正弦分离电压和FAIMS谱图峰位置下的严格求解方法,推导出严格的二阶、四阶系数求解方程。利用自制的高场不对称波形离子迁移谱仪分别对乙醇、间二甲苯和正丁醇三种典型的醇和苯类物质进行检测,获取了三种物质的FAIMS谱图,通过谱图峰位置获得了不同分离电压值下的补偿电压,利用最小二乘法求出三种离子非线性函数二阶、四阶系数。拟合后的均方误差表明FAIMS非线性函数严格求解的方法,明显优于现有的求解方法。有助于提高FAIMS检测分辨率,进而有助于建立更加准确的FAIMS图谱,实现FAIMS对检测物质的精准识别。     

微芯片电泳研究进展及其在离子检测中的应用

微芯片电泳具有检测迅速、易于便携化、消耗试剂少等优点,成为离子检测诸多手段中的热门方法。本文在介绍微芯片电泳原理的基础上,从微芯片电泳的结构、材料、制作工艺、表面改性、实验方法及其在离子检测中的应用等多个方面进行了综述,并对存在的问题以及未来的研究方向进行了总结和展望。     

Importance of PbI_2 morphology in two-step deposition of CH_3NH_3PbI_3 for high-performance perovskite solar cells

Controlling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of solar cell devices. In this work, we study the influence of the crystallization condition on PbI_2 morphology and the performances of resulting perovskite solar cells. The PbI_2 morphologies and coverage rates under different formation conditions such as solvent effect, slow crystallization at room temperature and substrate-preheating, are found to be of crucial importance for preparing high-quality perovskite. The generation of loosely packed disk-like PbI_2 film with interpenetrating nanopores promotes the penetration of methyl ammonium iodide(MAI), leading to a better crystallinity of the perovskite film, and a best repeatable power conversion efficiency of 11.59% is achieved when methyl ammonium lead triiodide(CH_3NH_3PbI_3, MAPbI_3) is employed. In addition, an excellent device is also obtained with an efficiency of more than 93% to remain after working for 43 days.