文献类型：期刊文献

英文题名：Fluorescence enhanced microfluidic sensor with CsPbI₃ probe for lubricant copper ions on-site rapid detection based on SiO₂ inverse opal photonic crystals

作者：Gao, Yuefeng[1];Xu, Sai[2];Liu, Zhijian[1];Yu, Kezhen[1];Wang, Chengfa[1];Wu, Sen[1];Wang, Junsheng[3];Pan, Xinxiang[1,4]

机构：[1]Dalian Maritime Univ, Coll Marine Engn, Dalian 116026, Liaoning, Peoples R China;[2]Dalian Maritime Univ, Sch Sci, Dalian 116026, Liaoning, Peoples R China;[3]Dalian Maritime Univ, Coll Informat & Sci Technol, Dalian 116026, Liaoning, Peoples R China;[4]Guangdong Ocean Univ, Maritime Coll, Zhanjiang 524088, Guangdong, Peoples R China

年份：2021

卷号：238

外文期刊名：JOURNAL OF LUMINESCENCE

收录：SCI-EXPANDED(收录号：WOS:000684034500001)、、WOS

基金：This research is supported by National Natural Science Foundation of China (52001047, 52071048, 51909019, 52001050) , State Environ-mental Protection Key Laboratory of Coastal Ecosystem (202106) , "Double FirstClass" Construction Project ( Ph.D. Innovative Talent Training Project of Dalian Maritime University, No. BSCXXM004) , Fundamental Research Funds for the Central Universities (3132021209, 3132021204) , Natural Science Foundation of Liaoning Province (2019MS029) , High-level personnel in Dalian innovation support program (2019RQ072) , National Key Research and Development and Development Program of China (2017YFC1404603) , Dalian Science and Technology Innovation Fund (2018J11CY021) .

语种：英文

外文关键词：Fluorescence-enhanced microfluidic sensor; Perovskites quantum dots probe; Copper ions on-site rapid detection; SiO2 inverse opal photonic crystals

外文摘要：Cu2+ content in diesel engine lubricating oil refers to a vital parameter suggesting the quality of oil and judging mechanical wear. Accordingly, the on-site rapid copper ions content determination in lubricant is of great sig-nificance to safe operation of diesel engines. However, most of the current researches on detection are carried out in laboratory, requiring the use of large-scale equipment such as spectrometer, which are not suitable for rapid on-site detection. Quantum dot-based optical microfluidic chip provides the possibility for heavy metal ions on-site detection, but it is subject to the defect of weak fluorescence intensity, thereby the increase in sensitivity is limited. In the present study, a microfluidic sensor using SiO2 inverse opal photonic crystals (IOPCs) to heighten CsPbI3 perovskite quantum dots (PQDs) photoluminescence (PL) intensity is proposed, which can realize rapid Cu2+ content detection in lubricant. Firstly, the selective detection characteristic of CsPbI3 on Cu2+ was studied. Experimental results showed that the photoluminescence of CsPbI3 was significantly quenched by Cu2+ because electrons were effectively transferred from CsPbI3 to Cu2+. Subsequently, to enhance the fluorescence intensity of CsPbI3 probe, the SiO2 IOPCs structure was formed in chip detection well. The effective PL intensity of CsPbI3 PQDs was enhanced by the photonic stopband effect formed by the periodically arranged micro-nano structure of photonic crystals. This enhancement effect was attributed to the coupling effect between stopband with exci-tation and emission light. As the stopband of SiO2 IOPCs was coupled with the excitation light wavelength and emission light wavelength of CsPbI3, the enhancement factors could reach 17-fold and 22-fold, respectively. The mentioned strategy could effectively improve the detection sensitivity of the microfluidic sensor and reduce the detection limit to 0.34 nM. Moreover, the formed microfluidic sensor system can be used for determination of Cu2+ content in lubricating oil on site. Meanwhile, the sturdy porous structure of SiO2 IOPCs also facilitated target metal ions to be captured and enriched.