Nanoscale LnMOF-functionalized nonwoven fibers protected by a polydimethylsiloxane coating layer as a highly sensitive ratiometric oxygen sensor
Nanoscale LnMOF-functionalized nonwoven fibers protected by a polydimethylsiloxane coating layer as a highly sensitive ratiometric oxygen sensor
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DOI：
10.1039/c6tc02569b
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发表时间：
2016-09
影响因子：
6.4
通讯作者：
Xiao-yu Xu;B. Yan
中科院分区：
文献类型：
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作者：
Xiao-yu Xu;B. Yan
镧系金属有机骨架（LnMOFs）结合了镧系发光材料和多孔基质的优点，在氧传感领域显示出巨大的潜力。在这项工作中，双发射纳米级LnMOFs，SUMOF-6-Eu，已被选为比率传感器，包含Eu 3+为基础的发光作为O2敏感的探针和配体（H2 pbydc）为基础的发光作为O2不敏感的参考探针。为了提高O2敏感性，采用原位晶体生长法在柔性非织造聚丙烯（PP）表面制备了纳米级SUMOF-6-Eu软膜。在聚二甲基硅氧烷（PDMS）涂层处理后，薄膜显示出高的化学稳定性在水分，长的发光寿命（1.074 ms）和绝对量子产率（62%）。在1 atm O2下，SUMOF-6-Eu薄膜的发光猝灭效率为89.9%，线性关系良好（KSV = 6.73，R2 = 0.99765），具有良好的可逆性，响应/恢复时间短（10/60 s），检测限低（0.45%）。这是由防水PDMS层保护的软LnMOF膜的第一个例子，用于比率O2传感。
Combining the advantages of lanthanide luminescent and porous matrixes, lanthanide metal–organic frameworks (LnMOFs) show great potential in O2 sensing. In this work, dual-emissive nanoscale LnMOFs, SUMOF-6-Eu, have been chosen as a ratiometric sensor that contains Eu3+-based luminescence as an O2-sensitive probe and ligand (H2pbydc)-based luminescence as an O2-insensitive reference probe. In order to improve O2 sensitivity, an in situ crystal-growth method was developed to fabricate nanoscale SUMOF-6-Eu soft films on flexible nonwoven polypropylene (PP) surfaces. After polydimethylsiloxane (PDMS)-coating treatment, the films show high chemical stabilities in moisture, long luminescence lifetimes (1.074 ms) and absolute quantum yields (62%). The coated nanoscale SUMOF-6-Eu films give rise to a high luminescence quenching efficiency of 89.9% at 1 atm O2 (R0/R100 = 7.66) with perfectly linear Stern–Volmer plots (KSV = 6.73, R2 = 0.99765), good reversibility, short response/recovery times (10/60 s) and low detection limits (0.45%). This is the first example of soft LnMOF films protected by a water-resistant PDMS layer for ratiometric O2 sensing.