量子产额
荧光
检出限
傅里叶变换红外光谱
化学
水溶液中的金属离子
吸光度
光致发光
猝灭(荧光)
分析化学(期刊)
离子
碳纤维
光谱学
光化学
材料科学
环境化学
化学工程
光电子学
物理
有机化学
工程类
量子力学
复合材料
色谱法
复合数
作者
Shruti Sharma,Papia Chowdhury
标识
DOI:10.1002/cplu.202400715
摘要
The present study focuses on synthesis of Urea-based carbon quantum dots (UCQDs) using a non-toxic, low-cost hydrothermal method without consumption of any harmful chemical. The synthesized UCQDs were characterized via UV-Vis absorbance, Photoluminescence (PL), and FTIR spectroscopy. Distinct UV-Vis absorption peaks due to π-π* and n-π* transitions and existence of excitation-independent PL emission peaks at ~450 nm and ~525 nm, validated the presence of carbogenic core and nitrogen-enriched surface states. For water dissolved iron (Fe3+) ions UCQD proves its sensitivity by "Turn Off" fluorescence response, while it shows a "Turn On" sensing for Pb2+ ions. Bensei Hildebrand analysis, Stern-Volmer plots, Job plot and FTIR analysis established the sensing capability of UCQDs by the formation of UCQD: Metal ion complexation. The high quantum yield (~38%), high sensitivity and the low detection limit highlight UCQD's real life applicability for environmental pollution monitoring. The successful detection and quantification of metal ions in real samples validates UCQD as potential future metal ion sensor.
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