摘要
NH4SCN能将三角形银纳米片(TAg-NPs)腐蚀。利用微量Cu2+与抗坏血酸(Vc)发生反应生成的Cu+进而被歧化为铜原子后,能有效覆盖在TAg-NPs活性银原子的表面,该覆盖层能阻止NH4SCN对TAg-NPs的腐蚀。导致TAg-NPs的形貌、颜色、最大吸收波长等特性随Cu2+浓度(6.0×10-8~1.0×10-6mol·L^(-1)范围)的改变而改变。基于TAg-NPs最大吸收波长的变化值与铜离子浓度之间存在的定量关系,建立了检测微量Cu2+的快速、简便的分光光度分析法。且基于Cu2+浓度不同引起的溶液颜色不同,建立了更为快速、简便的可视化半定量检测铜离子方法。
In this study, we found that the triangle silver nanoplate （TAg-NPs） could be etched by NH 4SCN. As a re su lt , the TAg- NPs transform from triangle to circle,the color of TAg-NPs turned from blue to yellow by the corrosive effect of NH 4SCN,and the maximum absorption peak of the TAg-NPs blue-shift. However,extremely low concentration of Cu2＋ could be reduced into Cu＋by as-corbic acid （VC）. Subsequently, Cu^ could produce disproportionation reaction to generate copper deposited on the surface of TAg- NPs, which could prevent TAg-Nps from the corrosion by NH 4SCN. When the concentration of N H 4SCN was c o n s ta n t , it is confirmed that the color was turned from yellow to blue,and the morphology transformed by nanodisc gradually into trangles,and the plasmon absorption of TAg-NPs changed with the change of the concentration of Cu2＋. The change values of the plasmon absorption of TAg- NPs were proportional to the concentrations of Cu2＋ in the range of 6.0×10-81.0×10-6mol·L-1. According to these phenomena, we demonstrated a novel method for Cu2＋ detection by either UV-visible spectrophotometric detection or naked-eye observation suc-cessfully.
出处
《化学研究与应用》
CSCD
北大核心
2017年第7期980-985,共6页
Chemical Research and Application
基金
国家自然科学基金项目(21275047)资助
