AgOx型超分辨近场结构的非线性光学特性研究

采用共焦Z扫描系统，以λ=532nm．脉冲宽度0．7ns．重复频率15．79kHz的脉冲半导体激光器作为入射光源，研究了AgOx超分辨近场结构(SuperRENS)薄膜样品的非线性光学性质．实验获得了其三阶非线性折射率系数随入射光功率的变化曲线．并与Au，Ag薄膜作了比较．讨论了光致非线性变化过程。结果表明，在聚焦激光作用下．AgOx超分辨近场结构薄膜样品存在一相变点．即解析出纳米Ag颗粒，满足了产生局域表面等离子体的激发和增强效应的条件。     

Composite planar electrode for sensing electrochemical oxygen demand

This work reports on the development of a graphite-polystyrene composite electrode of planar configuration, containing silver(II) oxide and copper(II) oxide catalysts (AgO-CuO), for the measurement of electrochemical oxygen demand (EOD). Optimisation studies of the composite composition as well as conditions for its processing on planar substrates and generation of an appropriate electrochemical active area resulted in the scalable fabrication of robust composite electrodes. These were evaluated with glucose as target analyte. They showed competitive low limits of detection in a linear concentration range from 5 mg L⁻¹ to 1400 mg L⁻¹ of O₂. Besides, they were stable for at least one year. The determination of EOD in wastewater samples coming from production lines of parenteral food and winemaking was successfully carried out.     

AgOx薄膜的光开关特性和机理研究

用磁控溅射法制备了具有超分辨近场结构的系列薄膜 ,测量了非线性层AgOx 的光开关特性及其结构随温度的变化 ,分析了AgOx 的光开关特性与微结构之间的内在联系     

非醇醚类助焊剂及其焊膏的研究

研究了多元醇类溶剂及其复配物对Sn0.3Ag0.7Cu焊膏性能的影响。结果表明:四氢糠醇和聚丙二醇对冰白和水白松香都具有较强的溶解性。当四氢糠醇和聚丙二醇以质量比9:1复配时,获得的焊膏平均铺展率可达87%以上,焊点完整、饱满、无焊球和桥连等缺陷,储存时间较长,是一种综合性能良好的焊膏。     

Effect of mixed cations in synergizing the performance characteristics of PVA-based polymer electrolytes for novel category Zn/AgO polymer batteries—a preliminary study

Thin films of polymer electrolytes comprising of PVA and KOH (A) with and without the addition of zinc salts, viz., zinc acetate (B) and zinc triflate (C) as mixed cations were prepared via. solution casting method. The thermal stability and ionic conductivity of PVA–KOH solid polymer electrolyte (A) were improved by the partial substitution of KOH with zinc salts. Among the two salts, zinc triflate was found to improve both the physical as well as electrochemical properties of the PVA–KOH films more significantly than zinc acetate. An attempt to optimize the ratio of various components of polymer electrolytes, viz., polymer: KOH: zinc salt was also made, based on the dimensional stability and ionic conductivity values. Finally, the select category polymer film containing PVA–KOH–zinc triflate (C) in an optimum ratio of 40:35:25 was deployed in coin cell fabrication and subjected to charge–discharge studies with a view to demonstrate the possible electrochemical reversibility characteristics. Based on the encouraging results obtained from the cycling study, C type films [PVA–KOH–zinc triflate] qualify themselves as potential polymer electrolytes for use in rechargeable Zn/AgO polymer batteries.     

硅藻土负载AgO复合材料的制备及热分解非等温动力学

采用化学氧化沉淀法, 以过硫酸钾为氧化剂制备了硅藻土负载过氧化银(AgO)复合材料, 并使用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和激光粒度仪对其进行了表征, 借助热重(TG)分析研究了复合材料的热分解过程和非等温热分解动力学. 结果表明, 制备的复合材料为正方晶系方英石和单斜晶系AgO混合体, 且AgO质量分数为12.7%; 复合材料的中位径为18.53 μm, 比表面积为203.32 m²/kg, 颗粒的粒度分布在0.614~116.5 μm之间. 复合材料中AgO在171 ℃开始分解成Ag₂O, 在更高温度时Ag₂O进一步分解成Ag; 热分解反应服从以核生成和核成长为控制步骤的A1机理, 其热分解表观活化能为131.37 kJ/mol, 反应频率因子为3.19×10¹³ s^-1. 同自制的AgO粉末相比, 复合材料中AgO的热分解温度升高, 表观活化能上升约40 kJ/mol.     

Towards a metallic quasi‐d9 system without copper: AgO at high pressure

AgO is a prototypical mixed‐valence compound, with markedly different coordination environment of dumbbell Ag(1+) and low‐spin square‐planar Ag(3+) which render it a narrow band gap semiconductor. The hybrid HSE06 functional reproduces fairly well the band gap of its P 2₁/c form at ambient conditions (ΔE_exp = 1.0–1.1 eV, ΔE_theor = 0.94 eV) and suggest progressive band gap decrease with external pressure with metallization at 50 GPa via band overlap. Dynamic (phonon) instability appears at the onset of metallization leading to a structural phase transition to a more stable but still metallic $$P\stackrel{?}{1}$$ form. The density of electronic states at the Fermi level of the $$P\stackrel{?}{1}$$ polymorph is small and a pseudo‐gap at the Fermi level is preserved.

Illustration of the predicted P2₁/c → $$P\stackrel{?}{1}$$ transformation.