Institute of Organic and Polymeric Materials, National Taipei University of Technology , Taipei, Taiwan 10608.
Department of Chemical Engineering, National Taiwan University , Taipei, Taiwan 10617.
ACS Appl Mater Interfaces. 2017 May 17;9(19):16381-16396. doi: 10.1021/acsami.7b00970. Epub 2017 May 3.
Novel red-green-blue (RGB) switchable probes based on fluorescent porous electrospun (ES) nanofibers exhibiting high sensitivity to pH and mercury ions (Hg) were prepared with one type of copolymer (poly(methyl methacrylatete-co-1,8-naphthalimide derivatives-co-rhodamine derivative); poly(MMA-co-BNPTU-co-RhBAM)) by using a single-capillary spinneret. The MMA, BNPTU, and RhBAM moieties were designed to (i) permit formation of porous fibers, (ii) fluoresce for Hg detection, and (iii) fluoresce for pH, respectively. The fluorescence emission of BNPTU (fluorescence resonance energy transfer (FRET) donor) changed from green to blue as it detected Hg. The fluorescence emission of RhBAM (FRET acceptor) was highly selective for pH, changing from nonfluorescent (pH 7) to exhibiting strong red fluorescence (pH 2). The full-color emission of the ES nanofibers included green, red, blue, purple, and white depending on the particular pH and Hg-concentration combination of the solution. The porous ES nanofibers with 30 nm pores were fabricated using hydrophobic MMA, low-boiling-point solvent, and at a high relative humidity (80%). These porous ES nanofibers had a higher surface-to-volume ratio than did the corresponding thin films, which enhanced their performance. The present study demonstrated that the FRET-based full-color-fluorescence porous nanofibrous membranes, which exhibit on-off switching and can be used as naked eye probes, have potential for application in water purification sensing filters.
基于荧光多孔静电纺丝 (ES) 纳米纤维的新型红绿蓝 (RGB) 可切换探针,对 pH 值和汞离子 (Hg) 具有高灵敏度,是用一种共聚物 (聚 (甲基丙烯酸甲酯-co-1,8-萘二甲酰亚胺衍生物-co-罗丹明衍生物); poly (MMA-co-BNPTU-co-RhBAM)) 通过使用单毛细管纺丝头制备的。MMA、BNPTU 和 RhBAM 部分旨在 (i) 允许形成多孔纤维,(ii) 荧光用于 Hg 检测,和 (iii) 分别用于 pH 值荧光。BNPTU(荧光共振能量转移 (FRET) 供体)的荧光发射从绿色变为蓝色,因为它检测到 Hg。RhBAM(FRET 受体)的荧光发射对 pH 值具有高度选择性,从非荧光 (pH 7) 变为显示强红色荧光 (pH 2)。ES 纳米纤维的全色发射包括绿色、红色、蓝色、紫色和白色,具体取决于溶液的特定 pH 值和 Hg 浓度组合。使用疏水性 MMA、低沸点溶剂和高相对湿度 (80%) 制造了具有 30nm 孔的多孔 ES 纳米纤维。与相应的薄膜相比,这些多孔 ES 纳米纤维具有更高的表面积与体积比,从而提高了它们的性能。本研究表明,基于 FRET 的全彩色荧光多孔纳米纤维膜具有开/关切换功能,可用作肉眼探针,在水净化传感过滤器中有应用潜力。