石墨烯负载纳米Ag颗粒增强ToF-SIMS分子离子峰

Enhancement of ToF-SIMS Molecular Ion Detection Using Dispersive Silver Nanoparticle-Graphene Composites

制备石墨烯与纳米Ag颗粒的复合材料(AgNP-GE),并用作新型衬底/基质材料,研究了Ag纳米颗粒对有机物分子峰的增强检测机制。用溶液滴涂法将两种样品Irganox 1010与Risperidone分散到AgNP-GE衬底上,并以ToF-SIMS对其表征。实验发现,两种样品均检测出(M+Ag)^(+),但Irganox 1010更容易产生(M+Ag)^(+),而Risperidone更容易产生(M+H)^(+)。表明AgNP-GE衬底可以起到类似氧化银(AgO)衬底的作用而形成(M+Ag)^(+)。由于石墨烯衬底自身有助于有机分子的(M+H)^(+)的形成,AgNP-GE有望成为提高有机物分子的分子离子峰检测灵敏度的一种新型基质材料。

In this paper,a composite of graphene and Ag nanoparticles was prepared and used as a new substrate/matrix to study the mechanism of organic molecular ion enhancement by silver nanoparticles.Two model compounds,Irganox 1010 and Risperidone were dispersed on AgNP-GE substrates by solution casting method and characterized by ToF-SIMS.The results show that(M+Ag)^(+) are detected for both samples,however Irganox 1010 sample is more likely to generate(M+Ag)^(+),while Risperidone sample is more likely to generate(M+H)^(+).This indicates that AgNP-GE substrate can play a similar role as silver oxide(AgO) substrate for generating(M+Ag)^(+).Since graphene substrate itself can also help to generate(M+H)^(+),AgNP-GE is expected to be a kind of new substrate/matrix material that can improve the detection sensitivity of organic molecular ions.