Development of a micro-planar Ag/AgCl quasi-reference electrode with long-term stability for an amperometric glucose sensor

This paper reports a micro-planar Ag/AgCl quasi-reference electrode (QRE) with long-term stability which is characterized by both long-term potential stability and practical immunity to interference species, and which has been applied for use with an amperometric glucose sensor for plasma glucose. For fabrication, we coated a silver/silver chloride (Ag/AgCl) electrode first with γ-aminopropyltriethoxysilane (γ-APTES) and then with perfluorocarbon polymer (PFCP). Tests demonstrate the new electrode’s ability to remain stable over an 82-day period in 150 mM KCl, and also show its imperviousness to the effects of interference species (1 mM KI and 1 mM KBr), pH, and serum. Furthermore, in tests for glucose concentrations in plasma samples, a good correlation coefficient, 0.954 (n=30, Y=1.02X+0.20), was demonstrated between results obtained with a clinical analyzer and those obtained with an amperometric glucose sensor that used the developed Ag/AgCl QRE, showing that the Ag/AgCl QRE functions well as a reference electrode for plasma samples.     

掺有浅电子陷阱的AgCl微晶的光电子衰减谱的时间分辨特性

利用微波吸收技术研究了K4Ru(CN)6浅电子陷阱掺杂剂对立方体AgCl微晶光生电子时间分辨特性的影响。结果表明,掺杂剂的掺杂量以及掺杂位置对乳剂的光生电子时间分辨特性都有影响。掺杂量为245×10-5mol·(molAg)-1,掺杂位置75%Ag时自由电子的衰减最慢,寿命最长。     

Ag/AgCl复合纳米粒子/聚丙烯腈纳米纤维膜的制备及可见光催化降解甲基橙

通过电纺丝法结合原位还原及原位氧化反应, 成功制备了均匀负载Ag/AgCl复合纳米粒子/聚丙烯腈(PAN)复合纳米纤维膜. 首先利用电纺丝技术制备了PAN/AgNO₃复合纳米纤维, 然后用乙二醇将硝酸银还原成银纳米粒子, 最后采用三氯化铁溶液对材料进行原位氧化. 所得纤维膜材料可以作为高效的可见光催化剂, 具有高可见光利用率, 优异的柔性和高光催化动力学等特性.     

酸度对AgCl溶胶表面吸附H2TPP化学反应的影响

讨论了ｍｅｓｏ四苯基卟啉（Ｈ２ＴＰＰ）吸附在ＡｇＣｌ溶胶表面的吸收光谱。实验表明,当ｐＨ＝２．０～６．０时,Ｈ２ＴＰＰ吸附于ＡｇＣｌ溶胶表面以卟啉二酸Ｈ４ＴＰＰ２＋存在;当ｐＨ＝６．７５～１１．０时,Ｈ２ＴＰＰ吸附于ＡｇＣｌ溶胶表面发生络合反应,生成二价银络合物Ａｇ（Ⅱ）ＴＰＰ,并且络合反应的速率随ｐＨ值的增大而加快。     

Control of Interfacial Potentials and Redox Reactions on Bipolar Electrodes Using Ag/AgCl

The interfacial potential difference on the surface of bipolar electrodes was controlled by placing Ag/AgCl on part of the electrode. Oxygen reduction on the cathodic pole was coupled with an electrochemiluminescence (ECL) reaction on the anodic pole. In an open bipolar system, the ECL intensity depended on the location of Ag/AgCl and the concentration of Cl⁻ ions. A current flowed through Ag/AgCl and the ratio of currents generated at the anodic and cathodic poles was affected by the position of Ag/AgCl. Further, the effect of Ag/AgCl placement was also demonstrated in a closed bipolar system using hydrogen peroxide (H₂O₂) and glucose as analytes. Ag/AgCl was also effective in adjusting the sensitivity to these analytes to achieve the best performance. This method of interfacial potential control is expected to contribute toward the development of reliable sensing devices and applications such as redox cycling, which require precise potential control.     

Metastable surface alloys produced by ion implantation,laser and electron beam treatment

Ion Implantation, Laser and Electron-beam Treatment (LET) of metals have been employed extensively to produce metastable surface alloys. Recent published work on implanted alloys is reviewed first. The dilute implanted alloys (solute concentration <10 at. %) are shown to lead to crystalline metastable solid solutions. At higher solute concentrations, an amorphous phase has been observed for several binary systems and recently for a ternary system. The physical mechanisms at play, are discussed in detail. A review of the surface alloys produced by LET of metals is then presented—with an emphasis on the mechanisms involved. In particular, general criteria governing formation of metastable solid solutions under LET are proposed and shown to have excellent agreement with available data on metals and Si.     

吸附在AgCl溶胶上的卟啉二酸H_4TPP~(2+)和H_4T(p-OCH_3)PP~(2+)的SERS和UVA光谱

本文研究了两种卟啉二酸——5,10,15,20-四苯基卟啉二酸(H_4TPP~(2+))和5,10,15,20-四对甲氧基苯基卟啉二酸(H_4T(p-OCH_3)pp~(2+))在AgCl溶胶上的表面增强拉曼光谱(SERS)和吸收光谱(UVA)。发现H_4TPP~(2+) 吸附在AgCl胶体上,发生部分去质子化;而H_4T(p-OCH_3)PP~(2+)则未发生去质子化作用。两者谱图的差别被归因于后者苯环上的取代基—OCH_3的给电子作用。     

可见光响应光催化剂Ag/AgCl@NH2-UiO-66的制备及其光催化性能

采用气相扩散-沉积-光还原法制备了可见光响应复合光催化剂Ag/AgCl@NH_2-UiO-66。通过X射线衍射(XRD)、电子扫描显微镜(SEM)、X射线能谱(EDS)、紫外可见漫反射光谱及X射线光电子能谱(XPS)等对催化剂的结构进行了表征。结果表明Ag/AgCl@NH_2-UiO-66具有优良的光催化活性,可见光条件下(λ≥420nm)对20mg·L~(-1)罗丹明的降解效率14min即可达到98%。     

外电场下AgCl分子的结构与性质

采用密度泛函理论B3P86方法计算了Ag Cl基态分子在不同场强条件下的稳定结构及激发态性质.研究了外电场对Ag Cl基态分子键长、总能量、电子结构、谐振频率和红外光谱强度及前10个激发态的吸收谱、激发能、振子强度的影响.结果表明随着沿Ag-Cl分子轴向电场的逐渐增大,Ag Cl分子键长逐渐减小;总能量则逐渐增大;电偶极矩单调减小;HOMO能级升高,而LUMO能级、费米能级和能隙均减小.谐振频率随正向电场增加而增大,而红外谱强度则逐渐减小.随着电场的增强,由基态至第1~10激发态的波长增大,激发能减小.     

Ag/AgCl@Cotton‐fabric:A Highly Stable and Easy‐recycling Plasmonic Photocatalyst under Visible Light Irradiation

Ag/AgCl@cotton‐fabric plasmonic photocatalyst has been synthesized by a facile method, which exhibits excellent stability for the decomposition of RhB and conveniency in the separation and recovery of the catalyst from the solution.