N-doped, silver, and cerium co-doped carbon quantum dots based sensor for detection of Hg2+ and captopril

检出限 卡托普利 量子产额 碳量子点 荧光 猝灭(荧光) 兴奋剂 碳纤维 离子 化学 无机化学 材料科学 光化学 核化学 量子点 纳米技术 色谱法 光电子学 有机化学 放射科 复合材料 物理 复合数 血压 医学 量子力学
作者
Lakshita Dewangan,Yogyata Chawre,Jyoti Korram,Indrapal Karbhal,Rekha Nagwanshi,Vishal Jain,Manmohan L. Satnami
出处
期刊:Microchemical Journal [Elsevier BV]
卷期号:182: 107867-107867 被引量:39
标识
DOI:10.1016/j.microc.2022.107867
摘要

• Studied the photoluminescence properties of single heteroatom doped carbon quantum dots (N-CQDs) and double heteroatom doped carbon quantum dots (N/Ag-CQDs, N/Ce-CQDs). • The transition metal (N/Ag-CQDs) and rare earth element (N/Ce-CQDs) in conjunction with nitrogen shows high passivation, which increases the photoluminescence quantum yields. • The fluorescence quenching (Turn-Off) of N-CQDs, N/Ag-CQDs and N/Ce-CQDs is occurred with the addition of Hg 2+ ion. • On the other hand, captopril showed fluorescence recovery (Turn-On) of N-CQDs, N/Ag-CQDs and N/Ce-CQDs which are quenched by Hg 2+ ion. The fluorescence recovery of CQDs is due to the high affinity of thiol group of captopril towards Hg 2+ ion to form Hg-S bonds. • This is the first time report to comparison of single heteroatom doped (N-CQDs) and double heteroatom doped (N/Ag-CQDs and N/Ce-CQDs) carbon quantum dots based sensor for Hg 2+ and captopril detection with the lowest detection limit. A stable carbon quantum dots doped with nitrogen (N-CQDs), co-doped with silver (N/Ag-CQDs), and co-doped with cerium N/Ce-CQDs were synthesized using hydrothermal method. As-synthesized N/Ag-CQDs and N/Ce-CQDs showed high quantum yield compared to N-CQDs. These carbon quantum dots were used as a probe for the detection of mercury and captopril. The fluorescence quenching (turn-off) of N-CQDs, N/Ag-CQDs and N/Ce-CQDs was occured with the addition of Hg 2+ ion. On the other hand, captopril showed fluorescence recovery (turn-on) of N-CQDs, N/Ag-CQDs and N/Ce-CQDs which are quenched by Hg 2+ ion. The fluorescence recovery of CQDs is due to the high affinity of thiol group of captopril towards Hg 2+ ion to form Hg-S bonds. On the basis of fluorescence quenching (turn-off), Hg 2+ was determined with low limit of detection of 1.43 nM, 0.93 nM and 1.38 nM using N-CQDs, N/Ag-CQDs and N/Ce-CQDs, respectively as fluorescence nanoprobes. The fluorescence Turn-on of the CQDs has been applied for the detection of captopril with low limit of detection of 1.65 µM, 0.46 µM and 1.22 µM using N-CQDs, N/Ag-CQDs, and N/Ce-CQDs respectively. The developed sensing probe showed good sensitivity and high fluorescence efficiencies.
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