Optical fiber long period grating sensor with a polyelectrolyte alternate thin film for gas sensing of amine odors

A long period grating optical fiber sensor with nano-assembled porphyrin layers for detecting ammonia gas

“…In a previous study, however, 16 we found almost symmetrical wavelength and transmission changes in both resonance 17 bands in the TS of a film deposited using poly(acrylic acid) as a polyanion [11,12]. The In order to increase the population of J-aggregates of TSPP in the film before it was exposed to ammonia the prepared PDDA/TSPP film was exposed to HCl vapor (produced 1 by aqueous 0.1 M HCl).…”

“…Transducers for sensing ammonia that are frequently used include 1 resistive devices, acoustic wave devices, and field-effect transducers [10]. sensors that could specifically bind target chemical species to be fabricated [11][12][13]. We 6 have recently demonstrated that optical fiber LPG sensors modified with different 7 functional coatings can be used to detect ammonia [11,12], aromatic carboxylic acids 8 [13], and the RI of a sample [14,15].…”

“…sensors that could specifically bind target chemical species to be fabricated [11][12][13]. We 6 have recently demonstrated that optical fiber LPG sensors modified with different 7 functional coatings can be used to detect ammonia [11,12], aromatic carboxylic acids 8 [13], and the RI of a sample [14,15]. The sensitivity of an LPG to the RI arises from the 9 dependence of the phase matching condition on the effective RI of the cladding modes, 10 which is governed by equation 1 [16], …”

Fiber Optic Sensors Based on Nanostructured Materials

“…The contribution of James et al to this field has reached a particular relevance in the last years, with different approaches of optical fiber sensors based on coated LPGs [43][44][45]. Among other examples, they have created VOC detectors [46][47][48], chemical sensors [49] or interferometers [50] based on this technology. In Fig.…”

A Comparative Study in the Sensitivity of Optical Fiber Refractometers based on the Incorporation of Gold Nanoparticles Into Layer-by-Layer Films

“…Among them, optical fiber has attracted the attention of many research groups in the last decades due to its intrinsic advantages such as light weight, small size, portability, remote sensing, and immunity to electromagnetic interferences or possibility of multiplexing several signals [4]. Different optical geometries such as single-mode fiber, multi-mode fiber, long-period fiber gratings (LPGs) or fiber Bragg gratings (FBGs) have been studied with the aim of increasing the sensitivity of the devices [5][6][7][8][9][10]. However, recent works have demonstrated that the use of nanodeposition techniques for the design of optical fiber sensors is becoming a hot topic in the fabrication of thin-film coated devices [11][12][13][14][15][16][17].…”