Detection of Melamine and Metallic Ions Based on Biocompatible Nanomaterials

• Main Authors: Maria Jessabel Talite, 唐婕
• Other Authors: Chi Tsu Yuan
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/78649101011635128896

碩士 === 中原大學 === 物理研究所 === 104 === Fluorescent nanomaterials such as Gold (Au) and Silver (Ag) nanoclusters in liquid phase have become one of the most essential nanomaterial and have aroused much attention in research due to their excellent photophysical properties and wide range of applications as optical label for biosensing. In addition to their outstanding optical properties, Au and Ag Nanoclusters have the desired benefits of biocompatibility and simple synthetic routes. The study looked into the development of novel heavy metals detection methods that are rapid, low-cost, simple, highly sensitive, and applicable to aqueous systems for the detection of melamine and metal ions in view of the fact that it has become an urgent need to protect our environment and health. The research work seeks to investigate the effects of heavy metal ions on fluorescence intensity and fluorescence lifetime of the biocompatible nanomaterials and explore the use of this ineraction as sensors for melamine and metal ions. The results showed that upon addition and gradual increase in the volume and concentration of fluorescent indicator to solution-processed biocompatible nanomaterials such as Gold and Silver Nanoclusters, fluorescence intensity decreases and the intact span of fluorescence lifetime shortens. It was found that as the concentration of melamine and selected metal ions such as Fe3+, Cu2+, Hg2+, Zn2+, Na+ metal ion increases, the fluorescence lifetime of nanomaterial decreases. Fluorescence spectra were recorded and fluorescence responses were evaluated upon addition of different concentrations of quenchers. Clearly, a distinguishable decrease in the fluorescence intensity and fluorescence lifetime can be observed.