Highly sensitive and selective cartap nanosensor based on luminescence resonance energy transfer between NaYF4:Yb,Ho nanocrystals and gold nanoparticles.
Highly sensitive and selective cartap nanosensor based on luminescence resonance energy transfer between NaYF4:Yb,Ho nanocrystals and gold nanoparticles.
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基于 NaYF4:Yb,Ho 纳米晶体和金纳米颗粒之间的发光共振能量转移的高灵敏度和选择性杀螟丹纳米传感器。
DOI：
10.1016/j.talanta.2013.02.069
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发表时间：
2013-09
期刊：
影响因子：
6.1
通讯作者：
Jiang, Zhaohua
中科院分区：
文献类型：
--
作者：
Wang, Zhijiang;Wu, Lina;Shen, Baozhong;Jiang, Zhaohua
荧光检测是检测有毒化学品的一种有吸引力的方法。然而，目前用于荧光检测的大多数化学传感器基于有机染料或量子点，其不稳定、高背景噪声和溶液中有机杂质的干扰，也可能被紫外线辐射激发。在本研究中，我们开发了一种新型 NaYF4:Yb,Ho/Au 纳米复合材料化学传感器，与竞争分析物相比具有高灵敏度 (10 ppb) 和选择性，可用于检测杀虫剂杀螟丹。该纳米传感器采用 970 nm 激光（而不是紫外线辐射）激发，在 541 nm 处产生发射峰。在存在杀螟丹的情况下，纳米复合材料聚集，导致 NaYF4:Yb,Ho 纳米晶体和金纳米颗粒之间的发光共振能量转移增强，从而降低了 541 nm 处的发射强度。 541 nm 处的相对发光强度与溶液中杀螟丹的浓度呈线性关系。基于这一行为，所开发的纳米传感器成功地检测了农产品和水样中的杀螟丹，并取得了令人满意的结果。
Fluorescent detection is an attractive method for the detection of toxic chemicals. However, most chemosensors that are currently utilized in fluorescent detection are based on organic dyes or quantum dots, which suffer from instability, high background noise and interference from organic impurities in solution, which can also be excited by UV radiation. In the present research, we developed a novel NaYF4:Yb,Ho/Au nanocomposite-based chemosensor with high sensitivity (10 ppb) and selectivity over competing analytes for the detection of the insecticide cartap. This nanosensor is excited with a 970-nm laser instead of UV radiation to give an emission peak at 541 nm. In the presence of cartap, the nanocomposites aggregate, resulting in enhanced luminescence resonance energy transfer between the NaYF4:Yb,Ho nanocrystals and the gold nanoparticles, which decreases the emission intensity at 541 nm. The relative luminescence intensity at 541 nm has a linear relationship with the concentration of cartap in the solution. Based on this behavior, the developed nanosensor successfully detected cartap in farm produce and water samples with satisfactory results.
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