Fiber optic based gas sensor with nanoporous structure for the selective detection of NO2 in air samples

Mechery, Shelly John; Singh, Jagdish P.

doi:10.1016/j.aca.2005.10.051

Cited by 25 publications

(17 citation statements)

References 26 publications

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“…As SBS is not affected by a single VOC, several sensors with different selectivities can be combined to obtain fingertips to identify global VOCs mixtures that could yield to SBS. Anyway, there are some cases where toxic vapors can be detected with a low interference from other vapors, which the case of NO 2 [46], CHCl 3 [37] and NH 3 [47].…”

Section: Challenges and Opportunities Of Opti-cal Fiber Sensors In Sbmentioning

confidence: 99%

Optical Fiber Sensors to Detect Volatile Organic Compound in Sick Building Syndrome Applications

Elosúa¹,

Bariain²,

Matı́as³

2010

TOBCTJ

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Health issues, such as Sick Building Syndrome (SBS), are being taken into account in new constructions, houses and several non industrial environments. SBS produces several manifestations, for example, respiratory irritative symptoms, headache and fatigue. It is caused by several factors. Most of them are related with the air quality, and the presence of Volatile Organic Compounds (VOCs), among other parameters. It is obvious that is very important to keep these parameters under control, and so, the development of new devices to achieve this is more and more interesting during last few years. Some important features using sensors for this application are robustness, easy installation, on line and real time use. Although there are electronic devices already available, optical fiber sensors offer all the performances mentioned before, as well as other ones exclusive of this technology: sensors networking and electromagnetic immunity mainly. In this work, we will show a review about the SBS aim, the sensing architectures of optical fiber technology, and the opportunities that it has in this increasing market niche.

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Section: Challenges and Opportunities Of Opti-cal Fiber Sensors In Sbmentioning

confidence: 99%

Optical Fiber Sensors to Detect Volatile Organic Compound in Sick Building Syndrome Applications

Elosúa¹,

Bariain²,

Matı́as³

2010

TOBCTJ

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“…As in the case of evanescent wave sensors, one solution commonly used is the dip coating technique of the optical fiber into a sol- gel solution previously doped with the sensing material [51, 53, 77-80]. …”

Section: Sensing Architecturesmentioning

confidence: 99%

“…This is very important in areas with highly explosive gases such as methane [20] or hydrogen [43], and in case of toxic gases such as NO 2 [77], chloroform vapors [76] or dichloromethane ones [72]. In these cases, special modulation techniques are used to enhance the selectivity of the sensors and hence avoid the effect of other gases.…”

Section: More Relevant Applications and Future Challengesmentioning

confidence: 99%

Volatile Organic Compound Optical Fiber Sensors: A Review

Elosúa

Matı́as

Bariain

et al. 2006

Sensors

169

103

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Volatile organic compound (VOC) detection is a topic of growing interest with applications in diverse fields, ranging from environmental uses to the food or chemical industries. Optical fiber VOC sensors offering new and interesting properties which overcame some of the inconveniences found on traditional gas sensors appeared over two decades ago. Thanks to its minimum invasive nature and the advantages that optical fiber offers such as light weight, passive nature, low attenuation and the possibility of multiplexing, among others, these sensors are a real alternative to electronic ones in electrically noisy environments where electronic sensors cannot operate correctly. In the present work, a classification of these devices has been made according to the sensing mechanism and taking also into account the sensing materials or the different methods of fabrication. In addition, some solutions already implemented for the detection of VOCs using optical fiber sensors will be described with detail.

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“…[1][2][3]. Comparing to other metal oxide materials TiO 2 fibres are very promising because of their exceptional physical and optical properties and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Crack Formation During Post-Treatment of Nano- and Microfibres Prepared by Sol–Gel Technique

Tätte¹,

Al²,

Hussainov³

et al. 2010

J. Nanosci. Nanotech.

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We report on the method of TiO2 nano- and microfibres preparation and their cracking during processing and post-treatment. Nano- and microfibres were fabricated by drawing from viscous alkoxide based oligomeric concentrate precursors with the following exposure into an atmosphere of 30-50% humidity. The fibres microstructure was analyzed with TEM, solid state NMR, X-ray diffraction tools, and AFM. Experiments on crack formation in TiO2 microfibres proved that fibres with diameter larger than 10 micron are fractured for chosen post-treatment regimes. In theoretical considerations sol-gel produced and thermally treated microfibres are modeled as core/shell structures. It is suggested that the formation of fibres starts via solidification of liquid jet through the appearance of a rigid solid shell, which reveals tensile mechanical stresses because of material shrinkage. The effect of post-treatment is taken into account by additional densification of the fibre surface layer. The stress intensity factor K(I) is calculated for the model core/shell structures and the dependence of K(I) on the fibre diameter is demonstrated. The results of modeling qualitatively confirm experimental data of microfibre cracking above a certain threshold diameter.

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Fiber optic based gas sensor with nanoporous structure for the selective detection of NO2 in air samples

Cited by 25 publications

References 26 publications

Optical Fiber Sensors to Detect Volatile Organic Compound in Sick Building Syndrome Applications

Optical Fiber Sensors to Detect Volatile Organic Compound in Sick Building Syndrome Applications

Volatile Organic Compound Optical Fiber Sensors: A Review

Crack Formation During Post-Treatment of Nano- and Microfibres Prepared by Sol–Gel Technique

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