Nanocrystalline Sm2O3 coated fiber optic sensor is proposed for detecting toxic gases such as ammonia, methanol and ethanol vapors. Sm2O3 in the as prepared form as well as annealed form have been used as gas sensing materials, by making them as cladding of a PMMA fiber. The spectral characteristics of the Sm2O3 gas sensor are presented for ammonia, methanol and ethanol gases with different concentrations ranging from 0 to 500 ppm. The sensor exhibits a linear variation in the output light intensity with the concentration. The enhanced gas sensitivity and selectivity of the sensor for ethanol is discussed briefly. © 2014 Elsevier B.V.

Angarai Ramanathan Ganesan

Department Of Physics

Balusamy Renganathan

Ammonia

Ethanol

Light sources

Methanol

Sensors

GAS SELECTIVITY

GAS SENSING MATERIAL

Light intensity

LINEAR VARIATION

Nanocrystallines

OPTIC GAS SENSOR

Spectral characteristics

TOXIC GAS DETECTIONS

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

Materials Science and Engineering B: Solid-State Materials for Advanced Technology

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

IEEE Sensors Journal

Thickness Dependency of Thin-Film Samaria-Doped Ceria for Oxygen Sensing

Materials Science and Engineering: B

A novel fiber-optic temperature sensor based on high temperature-dependent optical properties of ZnO film on sapphire fiber-ending

Sensor Letters

Optical Fiber Coated with Nanocrystalline Tin Oxide for Ammonia Vapour Sensing

Sensors and Actuators B: Chemical

CO and ethanol dual selective sensor of Sm2O3-doped SnO2 nanoparticles synthesized by microwave-induced combustion

Nanocrystalline samarium oxide coated fiber optic gas sensor

Journal	Data powered by TypesetMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Publisher	Data powered by TypesetElsevier BV
ISSN	09215107
Open Access	No