等离激元增强上转换发光及其分子检测应用
Plasmon-enhanced upconversion luminescence and application of molecular detection
杨扬 1李鹏城 2舒展 2屠能榮 2王宗花3
作者信息
- 1. 青岛大学,化学化工学院,材料科学与工程学院,青岛 266071;宁波工程学院,微纳材料与器件创新研究院,宁波 315211;宁波中乌新材料产业技术研究院有限公司,宁波 315201
- 2. 宁波工程学院,微纳材料与器件创新研究院,宁波 315211
- 3. 青岛大学,化学化工学院,材料科学与工程学院,青岛 266071
- 折叠
摘要
针对荧光分子检测普遍灵敏度低和检测范围窄的问题,制备了具有等离子激元共振特性的重掺杂半导体纳米结构Cu2-xS和典型的稀土掺杂上转换发光纳米颗粒NaYF4∶Yb,Er,通过三相界面自组装方法获得了 Cu2-xS/NaYF4∶Yb,Er薄膜基底.结合有限元模拟,计算了不同摆放情况下Cu2-xS周围的局域电场分布,研究了在实际薄膜中Cu2-xS纳米盘之间产生的等离激元耦合对上转换发光性能以及对拉曼信号增强的影响.结果表明,Cu2-xS等离激元层与NaYF4:Yb,Er发光层的耦合,不仅得到了上转换3个数量级的提高,还实现了分子检测10-7 mol·L-1的检测极限,并且获得了 10-3～10-7 mol·L-1的宽线性响应,从而达到高灵敏度的定性和定量双功能的精确检测.
Abstract
Fluorescence molecular detection exhibits limited development in detection applications due to generally low sensitivity and narrow detection range.The heavily doped semiconductor nanostructures Cu2-xS with surface plasmon resonance effect and typical rare-earth-doped upconversion luminescent nanoparticles NaYF4∶Yb,Er were prepared,and further Cu2-xS/NaYF4∶Yb,Er film substrates were obtained by three-phase interfacial self-assembly method.Combined with finite element method simulations,the local electric field distributions around Cu2-xS were calculated for different placement situations.The plasmon-coupling effect generated between Cu2-xS nanodisks was investigated on the upconversion luminescence performance and the Raman signals.Based on the intense upconver-sion luminescence caused by the excellent synergetic localized surface plasmon resonance effect,a dual detection method of qualitative before quantitative detection of Rhodamine B using surface-enhanced Raman scattering signal monitoring and fluorescence sensing was established.The results show that the coupling of the Cu2-xS plasmonic layer with the NaYF4∶Yb,Er luminescent layer not only enables three orders of magnitude improvement of upcon-version emission,but also achieves the detection limit of 10-7 mol·L-1for molecular detection and obtains a broad linear response from 10-3 to 10-7 mol·L-1,and finally realizes the qualitative and quantitative bifunctionality of high-sensitivity accurate detection.
关键词
Cu2-xS纳米盘/等离子激元共振/分子检测Key words
Cu2-xS nanodisk/plasmon resonance/molecular detection引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据