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介绍一种以银的局域表面等离子共振原理来检测过氧化氢的方法,银纳米颗粒是通过AgNO3在聚乙烯醇(PVA)中发生热还原生成的,PVA在合成过程中既作为还原剂又作为保护剂,在合成过程中不需要其他的试剂。该方法合成的银纳米颗粒通过紫外—可见分光光度计、透射电镜、X射线衍射仪器表征。由于银纳米颗粒能够催化分解过氧化氢,因此在分解过程能够诱导银纳米颗粒的降解,从而引起银纳米颗粒的表面等离子体共振吸收峰强度的明显变化,而且黄色的银胶体因此变的透明,从而能够检测过氧化氢的含量。当这种透明的混合溶液经过热处理后,溶液会重新变为黄色,经研究发现又重新生成银胶体,表面这是一种可再生的过氧化氢传感方法,由于该方法灵敏、高效、廉价、易于操作等优点将会在医学和环境监测方面有着巨大的应用价值。
A method for detecting hydrogen peroxide by using the principle of local surface plasmon resonance of silver is introduced. The silver nanoparticles are generated by thermal reduction of AgNO3 in polyvinyl alcohol (PVA). The PVA is used as both a reducing agent As a protectant, no additional reagents are required in the synthesis. The silver nanoparticles synthesized by the method are characterized by UV-visible spectrophotometer, transmission electron microscope and X-ray diffraction. Since silver nanoparticles can catalyze the decomposition of hydrogen peroxide, degradation of the silver nanoparticles can be induced during decomposition, causing a significant change in the surface plasmon resonance absorption peak intensity of the silver nanoparticles, and the yellow silver colloid thus becomes transparent, Thus, the hydrogen peroxide content can be detected. When this transparent mixed solution is heat-treated, the solution will turn yellow again. Silver colloids are regenerated upon study. The surface is a renewable hydrogen peroxide sensing method. Because this method is sensitive, efficient and inexpensive , Easy to operate and other advantages will have great application value in medical and environmental monitoring.