Fabrication of Humidity-Resistant Optical Fiber Sensor for Ammonia Sensing Using Diazo Resin-Photocrosslinked Films with a Porphyrin-Polystyrene Binary Mixture.
Fabrication of Humidity-Resistant Optical Fiber Sensor for Ammonia Sensing Using Diazo Resin-Photocrosslinked Films with a Porphyrin-Polystyrene Binary Mixture.
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DOI：
10.3390/s21186176
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发表时间：
2021-09-15
期刊：
影响因子：
--
通讯作者：
Lee SW
中科院分区：
文献类型：
--
作者：
Ahmed S;Park Y;Okuda H;Ono S;Korposh S;Lee SW
将重氮树脂(DAR)和四(4-磺基苯基)卟啉(TSPP)和聚苯乙烯磺酸(PSS)的二元混合物逐层沉积在多模U形光纤的纤芯上，制成了氨气传感器。通过剥离聚合物包层和包覆光纤芯层，增强了传输到逝去光场中的光的穿透性。在紫外光照射下，DAR中的重氮离子与TSPP和PSS中的磺酸盐残基之间的静电相互作用转化为共价键。用紫外-可见光谱和傅里叶变换红外光谱证实了膜之间的光反应。当光纤传感器暴露在浓度约为百万分之17(Ppm)的氨水溶液中产生的氨气中时，光纤传感器对氨的灵敏度是线性的。当曝光时间(30 S)缩短时，这种线性扩展到50ppm。用DAR/TSPP+PSS(1 mM TSPP和0.025 wt%PSS在水中的混合物)膜传感器将响应和恢复时间减少到30 S。优化后的传感器对溶液中氨的检出限估计为0.31ppm，相当于约0.03ppm的氨气。假设基质中PSS的疏水部分的存在抑制了湿度对传感器响应的影响。传感器的响应在七天内是稳定的和可重复性的。当与胺和非胺分析物一起检测时，含有PSS的U-弯曲型光纤传感器对氨也显示出更高的灵敏度。
Ammonia gas sensors were fabricated via layer-by-layer (LbL) deposition of diazo resin (DAR) and a binary mixture of tetrakis(4-sulfophenyl)porphine (TSPP) and poly(styrene sulfonate) (PSS) onto the core of a multimode U-bent optical fiber. The penetration of light transferred into the evanescent field was enhanced by stripping the polymer cladding and coating the fiber core. The electrostatic interaction between the diazonium ion in DAR and the sulfonate residues in TSPP and PSS was converted into covalent bonds using UV irradiation. The photoreaction between the layers was confirmed by UV-vis and Fourier transform infrared spectroscopy. The sensitivity of the optical fiber sensors to ammonia was linear when exposed to ammonia gases generated from aqueous ammonia solutions at a concentration of approximately 17 parts per million (ppm). This linearity extended up to 50 ppm when the exposure time (30 s) was shortened. The response and recovery times were reduced to 30 s with a 5-cycle DAR/TSPP+PSS (as a mixture of 1 mM TSPP and 0.025 wt% PSS in water) film sensor. The limit of detection (LOD) of the optimized sensor was estimated to be 0.31 ppm for ammonia in solution, corresponding to approximately 0.03 ppm of ammonia gas. It is hypothesized that the presence of the hydrophobic moiety of PSS in the matrix suppressed the effects of humidity on the sensor response. The sensor response was stable and reproducible over seven days. The PSS-containing U-bent fiber sensor also showed superior sensitivity to ammonia when examined alongside amine and non-amine analytes.
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DOI：
10.3390/s151025208
发表时间：
2015-09-30
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
Pospíšilová M;Kuncová G;Trögl J
通讯作者：
Trögl J
影响因子：
8.4
作者：
Cao, WQ;Duan, YX
通讯作者：
Duan, YX
DOI：
10.1073/pnas.071057598
发表时间：
2001-04-10
影响因子：
11.1
作者：
Narasimhan, LR;Goodman, W;Patel, CKN
通讯作者：
Patel, CKN
影响因子：
3
作者：
Satija, Jitendra;Punjabi, Nirmal Suresh;Mukherji, Soumyo
通讯作者：
Mukherji, Soumyo
影响因子：
5.3
作者：
Shipman, Michael A.;Symes, Mark D.
通讯作者：
Symes, Mark D.