碳化聚合物量子點用於探測潛伏指紋、色感測器以及光催化反應等多功能應用

Emergent Carbonized Polymer Dots as Versatile Featured Probe for Latent Fingerprints, Colorimetric Sensor, and Photocatalysis Applications

林承昊(Cheng-Hao Lin)

指導教授 ： 林金全

國立臺灣大學/理學院/化學研究所/碩士(2022年)

https://doi.org/10.6342/NTU202201241

摘要

碳點搭配聚乙烯亞胺聚合物量子點(CPPDs)被發展一種多功能的材料，它有許多不同的應用像是銅離子感測器、潛伏指紋辨識以及非金屬光催化劑。CPPDs可以使用簡易的水熱法合成，尼羅藍碳點被包覆在聚乙烯亞胺聚合物量子點內形成核殼結構，憑藉其優異的螢光特性，此材料當作螢光探針使用於辨識不同媒介上的潛伏指紋，螢光指紋的高解析度使我們可以觀測指紋上的特徵結構，像是核心、孔隙、分叉和脊。另外，此材料也可使用比色法去應用於二價銅離子的偵測。當二價銅離子加入 CPPDs水溶液，溶液顏色會由無色轉變為藍色，偵測極限分別為616nM，材料表面豐富的胺官能基與銅離子形成強作用力而生成錯合物。此材料也可當作光催化劑用於有毒六價鉻離子的光降解，94%的六價鉻離子的光降解反應可在可見光的照射下以30分鐘的時間完成，其速率常數為 0.1339min-1，由清除自由基檢測得知此六價鉻離子光降解反應賴材料照光生成的電子去還原六價鉻離子生成無毒性的三價鉻離子。最後，CPPDs有著聚集誘導發光的特殊性質，當它們存於一些溶劑像是二甲基亞碸及丙酮中會有更高的聚集狀態且螢光強度會增強。可以預期的是這項技術有著便利、低成本以及多種有效以碳點/聚合物量子點為根基的應用。

關鍵字

碳化聚合物量子點 ； 碳點 ； 聚合物量子點 ； 色度感測器 ； 潛伏指紋 ； 光催化反應 ； 聚集誘導發光

並列摘要

Carbon dots-incorporated polyethyleneimine polymer dots (CPPDs) were developed as a multifunctional nanomaterial for diverse applications including colorimetric sensors, latent fingerprints (LFPs), and metal-free photocatalysis. The facile hydrothermal method was applied to synthesize CPPDs in which the Nile blue-derived carbon dots (C-dots) were encapsulated by polyethyleneimine (PEI) polymer to form a core-shell nanostructured CPPDs. By taking advantage of excellent optical properties, the CPPDs were used as a fluorescent probe in the development of LFPs on various substrates. The developed LFPs were showed distinct fluorescent patterns with high resolution, providing information about the fingerprint including core, pores, bifurcations, and ridges. Secondly, the CPPDs were demonstrated as an efficient probe for colorimetric sensing of copper ions (Cu2+). When Cu2+ ions were individually added, the colorless CPPDs solution was turned to a blue color with a detection limit of 616 nM, respectively. The high selectivity and sensitivity were achieved due to the existence of abundant amine functional groups that lead to a stronger interaction with copper ions resulting in the complex formation. In addition to LFP and sensor applications, CPPDs were showed their proficiency as a photocatalyst towards the degradation of toxic chromium [Cr(VI)] solution. The photocatalytic degradation of Cr(VI) was performed under visible light illumination in which nearly 94% degradation was achieved in 30 min with a rate constant of 0.1339 min-1. An effective degradation process was governed by photogenerated electrons via reduction reaction which was confirmed from the measurements of reactive species scavengers. Last, CPPDs had a special property called aggregation-induced emission (AIE) which particles could become more aggregate in several solvents such as DMSO and acetone and become more emissive. It is anticipated that this work would lead to the development of facile, low-cost, and effective C dots/polymer dots-based nanomaterials for synergic applications.

並列關鍵字

carbonized polymer dots ； carbon dots ； polymer dots ； colorimetric sensor ； latent fingerprints ； photocatalysis ； aggregation Induced Emission

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