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首页> 外文期刊>RSC Advances >Depth profiling X-ray photoelectron spectroscopy and atomic force microscopy of Cd(II)- and Pb(II)-selective electrodes based on nano metal sulfides
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Depth profiling X-ray photoelectron spectroscopy and atomic force microscopy of Cd(II)- and Pb(II)-selective electrodes based on nano metal sulfides

机译：基于纳米金属硫化物的Cd（II）和Pb（II）选择电极的深度轮廓X射线光电子能谱和原子力显微镜

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This research involved constructing and studying plastic membrane Cd(II)- and Pb(II)-ion selective electrodes of the coated wire type based on nanoparticles of CdS and PbS as ionophores, respectively. The electrodes exhibited average linear concentration ranges of 1.0 × 10?6 to 1.0 × 10?2 and 9.6 × 10?7 to 1.0 × 10?2 M, average detection limits of 8.6 × 10?7 and 5.8 × 10?7 M, pH ranges of 2.2–5.8 and 2.9–5.9, and average calibration graph slopes of 28.56 and 28.81 mV per concentration decade, respectively. Both electrodes showed high selectivity towards many inorganic cations. Depth profiling X-ray photoelectron spectroscopy of fresh and expired membranes proved that: (a) the nanoparticles were homogeneously dissolved in the polymeric network and (b) the limitation of the life span of the plastic membrane was due to leaching of the active ingredient from the membrane surface to the bathing solution. The topography of fresh, active, and expired membranes as imaged by atomic force microscopy revealed the formation of a gel layer at the surface of the active electrode and drastic deformation of the expired membrane's surface.
机译：这项研究涉及基于CdS和PbS纳米粒子作为离子载体的包覆线型塑料膜Cd（ II ）-和Pb（ II ）离子选择性电极的构建和研究， 分别。电极的平均线性浓度范围为1.0×10 ？6 至1.0×10 ？2 和9.6× 10 ？7 到1.0×10 ？2 M，平均检出限为8.6×10 < sup>？7 和5.8×10 ？7 M，pH范围为2.2–5.8和2.9–5.9，并且平均校准图斜率每个浓度十年分别为28.56和28.81 mV。两个电极都显示出对许多无机阳离子的高选择性。新鲜和失效膜的深度轮廓X射线光电子能谱证明：（a）纳米颗粒均匀地溶解在聚合物网络中;（b）塑料膜寿命的限制是由于从中浸出的活性成分膜表面到沐浴液。通过原子力显微镜对新鲜的，活性的和失效的膜进行形貌分析，结果表明在活性电极的表面上形成了凝胶层，并且失效的膜表面发生了剧烈的变形。

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