Fiber optic gas sensors with nanoparticles of V2O5 and WO3 as the cladding of a PMMA fiber have been proposed in this work. The spectral response of these sensors for detection of ammonia, methanol and ethanol under various concentrations has been studied at room temperature. The time response characteristics of the sensors are also presented. © 2013 Elsevier B.V. All rights reserved.

Angarai Ramanathan Ganesan

Department Of Physics

Balusamy Renganathan

Nanocrystallines

OPTIC GAS SENSOR

Response characteristic

Room temperature

Spectral response

TOXIC GAS

Tungsten oxide

VANADIUM OXIDES

Chemical sensors

Fiber optic sensors

Nanoparticles

Oxides

Sensors

GAS DETECTORS

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Optics Communications

Clad-modified fibre optic ammonia sensor was developed subsequently using pure V2O5, MoO3, and its composites with TiO2. Prior to the sensing measurement, the composite was synthesised and studied for the structural and microstructural properties using powder X-ray diffractometer and field emission scanning electron microscope. The analysis confirms the existence of nanocrystalline anatase phase TiO2 in the grain boundaries of microcrystalline V2O5/MoO3 in the composites. Ammonia sensing measurement was performed for different concentrations of ammonia exposures up to 500 ppm. The obtained response was applied to calculate the sensitivity and it was found to be superior for the clad modified with composite material as compared to the pure microcrystalline samples are discussed in detail. © 2019The Institution of Engineering and Technology.

Micro and Nano Letters

Evanescent wave ammonia sensor: Influence of nanocrystalline tio2 on v2o5 and moo3

Nanocrystalline copper bromide (γ-CuBr) has been synthesized by hydrothermal method. The as-synthesized sample was characterized for its structural and microstructural properties using powder X-ray diffraction, electron diffraction and high resolution transmission electron microscope. The surface characteristics and optical properties of the sample were further studied with spectroscopy techniques such as FT-IR transmittance, diffused reflectance and fluorescence. Further, γ-CuBr nanocrystals was used as a gas sensing material in clad-modified optical fiber gas sensing system to explore its sensing behaviour for acetone (C3H6O), ammonia (NH3) and ethanol (C2H5OH). As compared with other gases, γ-CuBr nanocrystals showed superior sensitivity and specificity to acetone gas. The mechanism involved in the present, clad-modified optical fiber acetone sensor was discussed in detail. © 2018

Materials Science in Semiconductor Processing

Acetone sensing behaviour of optical fiber clad-modified with γ-CuBr nanocrystals

A clad modified optical fiber gas sensor for sensing volatile organic compound vapours (VOCs) such as formaldehyde (HCHO), ammonia (NH3), ethanol (C2H5OH) and methanol (CH3OH) up to 500 ppm was studied using nanocrystalline nickel oxide embedded coatings. Prior to the measurements, nickel oxide in two different crystallite sizes such as 24 nm and 76 nm was synthesized by calcination of reverse precipitated nickel hydroxide subsequently at 450 °C and 900 °C for 30 min. Then, samples physical properties were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM). Our gas sensing measurement concludes that the lower crystallite size (24 nm) nickel oxide nanocrystals exhibits superior performance to formaldehyde and ethanol vapours as compared with other two VOCs, the observed experimental results were discussed in detail. © 2017 Elsevier Inc.

Optical Fiber Technology

Clad modified optical fiber gas sensors based on nanocrystalline nickel oxide embedded coatings

Optics & Laser Technology

Nanocrystalline ZnO coated fiber optic sensor for ammonia gas detection

Sensors and Actuators B: Chemical

Gas sensors based on anodic tungsten oxide

NO2 sensing properties of WO3 varistor-type gas sensor

Vanadium oxide-porphyrin nanocomposites as gas sensor interfaces for probing low water content in ethanol

Doped-vanadium oxides as sensing materials for high temperature operative selective ammonia gas sensors

Fiber optic gas sensors with vanadium oxide and tungsten oxide nanoparticle coated claddings

Journal	Optics Communications
ISSN	00304018
Open Access	No