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Embedding carbon dots and gold nanoclusters in metal-organic frameworks for ratiometric fluorescence detection of Cu2.
Analytical and Bioanalytical Chemistry ( IF 3.8 ) Pub Date : 2020-01-11 , DOI: 10.1007/s00216-019-02353-5
Qingqing Tan 1 , Ruirui Zhang 2 , Guoyan Zhang 1 , Xiaoya Liu 1 , Fengli Qu 1 , Limin Lu 3
Affiliation  

Herein, a dual-emission metal-organic framework based ratiometric fluorescence nanoprobe was reported for detecting copper(II) ions. In particular, carbon dots (CDs) and gold nanoclusters (AuNCs) were embedded into ZIF-8 (one of the classical metal-organic frameworks) to form CDs/AuNCs@ZIF-8 nanocomposites, which exhibited dual-emission peaks at UV excitation. In the presence of Cu2+, the fluorescence attributed to AuNCs can be rapidly quenched, while the fluorescence of CDs serves as reference with undetectable changes. Therefore, the CDs/AuNCs@ZIF-8 nanocomposites were utilized as a ratiometric fluorescence nanoprobe for sensitive and selective detection of Cu2+. A good linear relationship between the ratiometric fluorescence signal of CDs/AuNCs@ZIF-8 and Cu2+ concentration was obtained in the range of 10-3-103 μM, and the detection limit was as low as 0.3324 nM. The current ratiometric fluorescence nanoprobe showed promising prospects in cost-effective and rapid determination of Cu2+ ions with good sensitivity and selectivity. Furthermore, this nanoprobe has been successfully applied for the quantitative detection of Cu2+ in serum samples, indicating its value of practical application. Graphical abstract Carbon dots (CDs) and gold nanoclusters (AuNCs) were embedded into metal-organic frameworks (ZIF-8) to form CDs/AuNCs@ZIF-8 nanocomposites, which exhibited dual-emission peaks at 365 nm excitation. In the presence of Cu2+, the fluorescence emission peak at 574 nm can rapidly respond by quenching, while the fluorescence at 462 nm serves as reference with undetectable changes.

中文翻译:

将碳点和金纳米簇嵌入金属-有机框架中,用于Cu2的比例荧光检测。

在此,报道了基于双发射金属-有机骨架的比例荧光纳米探针,用于检测铜(II)离子。特别是,将碳点(CD)和金纳米团簇(AuNCs)嵌入ZIF-8(经典的金属有机框架之一)中以形成CD / AuNCs @ ZIF-8纳米复合材料,该复合物在紫外线激发下表现出双发射峰。在存在Cu2 +的情况下,归因于AuNCs的荧光可以快速淬灭,而CD的荧光可以作为参考,但检测不到变化。因此,CDs / AuNCs @ ZIF-8纳米复合材料被用作比率荧光纳米探针,用于敏感和选择性地检测Cu2 +。在10-3-103μM范围内,CDs / AuNCs @ ZIF-8的比例荧光信号与Cu2 +浓度之间具有良好的线性关系,检测限低至0.3324 nM。当前的比例荧光纳米探针在具有成本效益和快速测定Cu2 +离子方面具有良好的灵敏度和选择性,显示出广阔的前景。此外,该纳米探针已成功应用于血清样品中Cu2 +的定量检测,表明其实际应用价值。图形化的抽象碳点(CD)和金纳米团簇(AuNCs)嵌入金属-有机骨架(ZIF-8)中以形成CDs / AuNCs @ ZIF-8纳米复合材料,该复合物在365 nm激发下表现出双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。当前的比例荧光纳米探针在具有成本效益和快速测定Cu2 +离子方面具有良好的灵敏度和选择性,显示出广阔的前景。此外,该纳米探针已成功应用于血清样品中Cu2 +的定量检测,表明其实际应用价值。图形化的抽象碳点(CD)和金纳米团簇(AuNCs)嵌入金属-有机骨架(ZIF-8)中以形成CDs / AuNCs @ ZIF-8纳米复合材料,该复合物在365 nm激发下表现出双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。当前的比例荧光纳米探针在具有成本效益和快速测定Cu 2+离子方面具有良好的灵敏度和选择性,显示出广阔的前景。此外,该纳米探针已成功应用于血清样品中Cu2 +的定量检测,表明其实际应用价值。图形化的抽象碳点(CD)和金纳米团簇(AuNCs)嵌入金属-有机骨架(ZIF-8)中以形成CDs / AuNCs @ ZIF-8纳米复合材料,该复合物在365 nm激发下表现出双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。该纳米探针已成功用于血清样品中Cu2 +的定量检测,表明其实际应用价值。图形化的抽象碳点(CD)和金纳米团簇(AuNCs)嵌入金属-有机骨架(ZIF-8)中以形成CDs / AuNCs @ ZIF-8纳米复合材料,该复合物在365 nm激发下表现出双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。该纳米探针已成功用于血清样品中Cu2 +的定量检测,表明其实际应用价值。图形化的抽象碳点(CD)和金纳米团簇(AuNCs)嵌入金属-有机骨架(ZIF-8)中以形成CDs / AuNCs @ ZIF-8纳米复合材料,该复合物在365 nm激发下表现出双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。在365 nm激发下显示双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。在365 nm激发下显示双发射峰。在存在Cu 2+的情况下,在574 nm处的荧光发射峰可以通过猝灭快速响应,而在462 nm处的荧光作为参考存在不可检测的变化。
更新日期:2020-01-13
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