1 引言
2 结果与讨论
2.1 荧光分子BTD的设计及光物理性质
图1 (a) BTD在二氯甲烷溶剂中的紫外-可见吸收光谱和荧光发射光谱; (b) BTD在不同溶剂中的荧光发射光谱(CBTD=5×10−6 mol/L)Figure 1 (a) UV-Vis and fluorescence spectra of BTD in DCM. (b) Fluorescence emission spectra of BTD in different solvents (CBTD=5×10−6 mol/L) DCM: Dichloromethane; THF: Tetrahydrofuran; TCM: Chloroform; MeOH: Methanol; DMF: N,N-Dimethylformamide, λex=305 nm |
2.2 荧光水凝胶的荧光及流变性能
图2 (a) Agar-BTD凝胶在日光灯和紫外灯下的照片; (b) Agar-BTD和BTD固体的荧光发射光谱; (c) Agar和Agar-BTD凝胶的G'和G''随剪切应力变化的曲线; (d) Agar-BTD凝胶的G'和G''随角频率变化的曲线; (e) Agar-BTD凝胶的G'和G''随时间的变化曲线Figure 2 (a) Photos of Agar-BTD gel under daylight and ultraviolet light; (b) Fluorescence emission spectra of Agar-BTD and BTD powder; (c) Curves of G' and G'' of Agar and Agar-BTD gel varying with shear stress; (d) Curves of G' and G'' of Agar-BTD gel varying with angular frequency; (e) Curves of G' and G'' of Agar-BTD gel varying with time |
2.3 荧光干凝胶的表征
图3 (a) Agar-BTD材料在日光灯和紫外灯下的照片; (b) Agar-BTD材料的柔韧性照片; (c) Agar-BTD材料的扫描电子显微镜图片; (d) Agar、BTD和Agar-BTD材料的傅里叶变换红外光谱Figure 3 (a) Photos of Agar-BTD materials under daylight and ultraviolet light; (b) Photos of the Agar-BTD materials upon bending; (c) SEM image of the Agar-BTD materials; (d) Fourier transform infrared spectra of Agar, BTD, and Agar-BTD materials |
2.4 荧光凝胶对硝基苯酚异构体的传感性能
图5 (a)不同浓度邻硝基苯酚蒸汽存在时Agar-BTD材料的荧光光谱; (b) Agar-BTD材料的荧光强度与邻硝基苯酚浓度之间的线性曲线; (c) Agar-BTD材料对潜在干扰物的荧光响应强度; 1: 苯胺, 2: 间碘苯甲醛, 3: 氯苯, 4: 三乙胺, 5: 间溴苯酚, 6: 4-碘硝基苯, 7: 邻硝基苯酚, 8: 间硝基苯酚, 9: 对硝基苯酚, 10: 乙酸, 11: 水, 12: 甲苯, 13: 甲醇, 14: 乙醇; (d)邻硝基苯酚泄漏的模拟检测场景Figure 5 (a) Fluorescence spectra of the Agar-BTD materials in the presence of different concentrations of o-NP vapor; (b) Linear relationship between fluorescence intensity of the Agar-BTD materials and o-NP vapor concentration; (c) Fluorescence responses of the Agar-BTD materials to some potential interferences; 1: Aniline, 2: m-Iodobenzaldehyde, 3: Chlorobenzene, 4: Triethylamine, 5: m-Bromophenol, 6: 4-Iodonitrobenzene, 7: o-NP, 8: m-NP, 9: p-NP, 10: Acetic acid, 11: H2O, 12: Toluene, 13: Methanol, 14: Ethanol; (d) Monitoring of o-NP vapor leakage using the Agar-BTD materials |