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標題: | 電化學法製備碳點並應用於金離子檢測 Electrochemical synthesis of carbon dots for sensing of Au3+ ions |
作者: | Chun-Ting Wu 吳郡庭 |
指導教授: | 張煥宗(Huan-Tsung Chang) |
關鍵字: | 碳點,電化學合成,麩胺酸,乙二胺,金離子檢測, carbon nanodots,electrochemical synthesis,L-glutamic acid,ethylenediamine,Au3+ detection, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 碳奈米點 (碳點) 是一種新興的螢光奈米材料,除了製備簡單外,優越的光學性質和良好的生物相容性皆使其成為螢光探針的理想材料,本研究中,我們選用麩胺酸和乙二胺作為前驅物,利用新穎的電化學合成法來製備碳點,此方法不需要外加高溫,並且能隨時間量測碳點形成過程中的變化。麩胺酸因同時具有羧基和胺基,容易於電化學合成過程中進行縮合反應,而乙二胺可作為氮源,除了能提高碳點量子產率外,同時也扮演表面鈍化和功能化的角色,賦予其表面大量胺基和醯胺基,有利於與金離子 (Au3+) 螯合。最後我們將所合成之碳點應用於金離子檢測,其線性範圍為0.5–5 μM (R2 = 0.98),偵測極限為0.28 μM,並成功利用此方法檢測溶於王水溶液中之廢棄電子元件的金離子含量。 Carbon nanodots (C-dots), as emerging fluorescent nanomaterials, possess many advantages such as low cost and simple production process, unique optical properties, and good biocompatibility. These make it an ideal candidate for the fluorescent sensors. In this study, a novel one-step electrochemical method was used for the preparation of C-dots. The method is energy-saving, and could be monitoring the synthesis process of C-dots. L-glutamic acid and ethylenediamine were chosen as precursors. L-glutamic acid is an amino acid with carboxyl and amine groups which can form C-dots easily. Ethylenediamine can improve the quantum yield of C-dots by enhancing the doping of nitrogen atoms, and can act as passivation and functionalization agents in the meantime. The as-prepared C-dots are rich in amino and amide functional groups on the surface, resulting in high sensitivity and selectivity toward Au3+ ions. The detection linear range is from 0.5–5 μM (R2 = 0.98) with detection limit of 0.28 μM. This assay was successfully applied to quantitation of Au3+ in electronic waste with pretreatment in aqua regia. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/20765 |
DOI: | 10.6342/NTU202004081 |
全文授權: | 未授權 |
顯示於系所單位: | 化學系 |
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