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Shiquan Tao

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University of Massachusetts, Boston

Céline (O'Gorman) Tevlin

University of Nottingham

Anne Sophie Meincke (Spann)

University of Vienna

Amina Ahmed El-Imam

University of Ilorin

Cairo University

Joanna K Malinowska

Adam Mickiewicz University in Poznań

Animal Health Research Institute

Salah Abdelbary

Al-Azhar University

University of Ibadan

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Papers by Shiquan Tao

Optical fiber sensor having a sol-gel fiber core and a method of making

High dynamic range fiber optic relative humidity sensor

Optical Engineering, 2002

[Optical Engineering 41, 1093 (2002)]. Rajeev Jindal, Shiquan Tao, Jagdish P. Singh, Parikshit S.... more

Mercury atomic absorption by mercury atoms in water observed with a liquid core waveguide as a long path absorption cell

The Analyst, 2004

... Shiquan Tao*, Shoufeng Gong, Lina Xu and Joseph C. Fanguy. Diagnostic Instrumentation and Ana... more

Optical fiber evanescent wave absorption spectrometry of nanocrystalline tin oxide thin films for selective hydrogen sensing in high temperature gas samples

Talanta, 2009

SnO 2 nanocrystalline material was prepared with a sol-gel process and thin films of the nanocrys... more SnO 2 nanocrystalline material was prepared with a sol-gel process and thin films of the nanocrystalline SnO 2 were coated on the surface of bent optical fiber cores for gas sensing. The UV/vis absorption spectrometry of the porous SnO 2 coating on the surface of the bent optical fiber core exposed to reducing gases was investigated with a fiber optical spectrometric method. The SnO 2 film causes optical absorption signal in UV region with peak absorption wavelength at around 320 nm when contacting H 2-N 2 samples at high temperatures. This SnO 2 thin film does not respond to other reducing gases, such as CO, CH 4 and other hydrocarbons, at high temperatures within the tested temperature range from 300 • C to 800 • C. The response of the sensing probe is fast (within seconds). Replenishing of the oxygen in tin oxide was demonstrated by switching the gas flow from H 2-N 2 mixture to pure nitrogen and compressed air. It takes about 20 min for the absorption signal to decrease to the baseline after the gas sample was switched to pure nitrogen, while the absorption signal decreased quickly (in 5 min) to the baseline after switching to compressed air. The adhesion of tin oxide thin films is found to be improved by pre-coating a thin layer of silica gel on the optical fiber. Adhesion increases due to increase interaction of optical fiber surface and the coated silica gel and tin oxide film. Optical absorption spectra of SnO 2 coating doped with 5 wt% MoO 3 were observed to change and red-shifted from 320 nm to 600 nm. SnO 2 thin film promoted with 1 wt% Pt was found to be sensitive to CH 4 containing gas.

Optical fiber ammonia sensing probes using reagent immobilized porous silica coating as transducers

Sensors and Actuators B: Chemical, 2006

... Giuliani et al. [12] used a small piece of silica capillary coated on the inner surface with ... more ... Giuliani et al. [12] used a small piece of silica capillary coated on the inner surface with a laser dye (Oxazine 170) as a transducer for sensing ammonia in air gas. ... In brief, the central part of a conventional silica optical fiber with two ends polished was inserted into a small flame. ...

An active core fiber optic sensor for detecting trace H2S at high temperature using a cadmium oxide doped porous silica optical fiber as a transducer

Sensors and Actuators B: Chemical, 2007

An active core fiber optic sensor has been developed for detecting trace H2S in high-temperature ... more An active core fiber optic sensor has been developed for detecting trace H2S in high-temperature gas samples. This sensor uses a cadmium oxide doped porous silica optical fiber prepared with a sol–gel process as a transducer. When this porous silica optical fiber was exposed to a gas sample at high temperatures, trace H2S in the sample diffuse into the porous

A fiber optic temperature sensor with an epoxy-glue membrane as a temperature indicator

Sensors and Actuators B: Chemical, 2006

A fiber optic temperature sensor for monitoring/detecting ambient temperature ranging from room t... more A fiber optic temperature sensor for monitoring/detecting ambient temperature ranging from room temperature (25 • C) to ∼100 • C has been described. This sensor uses polycyclic aromatic compounds (PAHs) presenting in a commercially available epoxy glue as the temperature indicator. The PAHs in the epoxy glue fluoresce when excited with a UV light source. The intensity of the fluorescence of the PAHs decreases when the epoxy glue is exposed to an environment of higher temperature. Therefore, the reduction of fluorescence signal can be used to indicate temperature. A simple structured optical fiber temperature transducer has been constructed by gluing two silica optical fibers together with the epoxy glue. An optical fiber temperature sensor was built up by connecting one of the fibers to a UV light emitting diode and the other fiber to an optical fiber compatible UV-vis spectrometer. The sensor has been tested for monitoring temperature from room temperature up to 100 • C. The attenuation of the fluorescence intensity of the fiber optic sensor in dB has a linear relationship with temperature in the tested range. In this paper, the principle, fabrication, response characteristics, calibration, stability of this sensor and possible applications of the temperature sensing principle established in this work are discussed.

Optical fiber humidity sensor based on evanescent-wave scattering

Optics Letters, 2004

Testing the light scattering in the porous sol-gel silica coating.. 3.3 Testing the response of t... more Testing the light scattering in the porous sol-gel silica coating.. 3.3 Testing the response of the sol gel silica coated bent fiber probe to moisture…………………………………………… 3.3.1 Testing the sol gel silica coating EWS for moisture sensing…………………………………………………. 3.3.2 Testing the sol gel silica coating EWS and absorption for monitoring low level moisture content .

$1.8 The light transmission of porous silica. The transmission in the graph is the fraction of light intensity transmitted through the porous silica [28]. silica’s amorphous structure. In this region, sol gel silica is an adequate optical material.$

$gel silica satisfy the requirement of total internal reflection. the lower refractive index, total internal reflection occurs. Optical fiber core and the sol$

Nanostructured scintillating optical fiber prepared via sol-gel technique for detecting gamma radiation

Optics Letters, 2009

An innovative scintillating material prepared through distributing cesium iodide (CsI) nanocrysta... more An innovative scintillating material prepared through distributing cesium iodide (CsI) nanocrystals into pores of a transparent nanoporous silica using a sol-gel technology has been developed. The CsI nanocrystals doped porous silica material has been designed and made into an optical fiber by using a patented solgel technique. This CsI-doped sol-gel silica optical fiber was conveniently connected to a highly sensitive photon detector in testing the material for detecting gamma radiation. The preliminary test result reported in this Letter clearly demonstrates the feasibility of this scintillating fiber for detecting high-energy radiations.

ICP原子発光分析におけるin situ化学反応による新規な試料導入法の開発とその応用

Bunseki kagaku, 1996

Optical-Fiber Sensor Using Tailored Porous Sol-Gel Fiber Core

IEEE Sensors Journal, 2004

Since 1975, he has worked on the development of lasers and their applications. He has over 106 re... more Since 1975, he has worked on the development of lasers and their applications. He has over 106 referred publications. His research interests include lasers, laser spectroscopy, optical-fiber sensors, electronics, molecular dynamics, laser diagnostics for combustion, laser ultrasonics, and hazardous waste management. Dr. Singh is a member of the SPIE, OSA, AIAA, ACS, ISA, and SAS.

$Research paper thumbnail of An Optical Fiber ${\rm H}_{2}{\rm O}_{2}$-Sensing Probe Using a Titanium(IV) Oxyacetylacetonate Immobilized Nafion Coating on an Bent Optical Fiber Probe$

An Optical Fiber ${\rm H}_{2}{\rm O}_{2}$-Sensing Probe Using a Titanium(IV) Oxyacetylacetonate Immobilized Nafion Coating on an Bent Optical Fiber Probe

IEEE Sensors Journal, 2011

An optical fiber sensor technique has been developed for monitoring trace in aqueous solutions. A... more An optical fiber sensor technique has been developed for monitoring trace in aqueous solutions. A titanium(IV) oxyacetylacetonate doped Nafion coating on the surface of a bent optical fiber probe was used as a transducer. Trace in an aqueous solution diffused into the polymer coating reacts with the sensing agent. The resulted product absorbs light with peak absorption wavelength at 360 nm, which is detected by using op- tical fiber evanescent wave absorption spectrometry. This sensor reversibly responses to trace in water, and has a detection limit of . This fiber-optic sensor is immune of interferences from electromagnetic field which makes it useful in proton exchange membrane fuel cell researches.

Development and evaluation of optical fiber NH3 sensors for application in air quality monitoring

Atmospheric Environment, 2013

h i g h l i g h t s < Optical fiber NH 3 sensors have been developed. < The feasibility of using ... more h i g h l i g h t s < Optical fiber NH 3 sensors have been developed. < The feasibility of using the sensors for air quality monitoring has been investigated. < The sensors are reversible, can be used for continuous monitoring NH 3 in air. < The sensors are highly sensitive, can detect NH 3 in ppbv level. < Cross responses of the sensors to moisture, CO 2 and temperature change have been investigated.

Electrochemical vaporization of trace beryllium via in situ alkylation for inductively coupled plasma atomic emission spectrometry

Analytica Chimica Acta, 1994

A novel sample introduction method based on in situ alkylation for inductively coupled plasma ato... more

Optical fiber sensor having a sol-gel fiber core and a method of making

High dynamic range fiber optic relative humidity sensor

Optical Engineering, 2002

[Optical Engineering 41, 1093 (2002)]. Rajeev Jindal, Shiquan Tao, Jagdish P. Singh, Parikshit S.... more

Mercury atomic absorption by mercury atoms in water observed with a liquid core waveguide as a long path absorption cell

The Analyst, 2004

... Shiquan Tao*, Shoufeng Gong, Lina Xu and Joseph C. Fanguy. Diagnostic Instrumentation and Ana... more

Optical fiber evanescent wave absorption spectrometry of nanocrystalline tin oxide thin films for selective hydrogen sensing in high temperature gas samples

Talanta, 2009

SnO 2 nanocrystalline material was prepared with a sol-gel process and thin films of the nanocrys... more SnO 2 nanocrystalline material was prepared with a sol-gel process and thin films of the nanocrystalline SnO 2 were coated on the surface of bent optical fiber cores for gas sensing. The UV/vis absorption spectrometry of the porous SnO 2 coating on the surface of the bent optical fiber core exposed to reducing gases was investigated with a fiber optical spectrometric method. The SnO 2 film causes optical absorption signal in UV region with peak absorption wavelength at around 320 nm when contacting H 2-N 2 samples at high temperatures. This SnO 2 thin film does not respond to other reducing gases, such as CO, CH 4 and other hydrocarbons, at high temperatures within the tested temperature range from 300 • C to 800 • C. The response of the sensing probe is fast (within seconds). Replenishing of the oxygen in tin oxide was demonstrated by switching the gas flow from H 2-N 2 mixture to pure nitrogen and compressed air. It takes about 20 min for the absorption signal to decrease to the baseline after the gas sample was switched to pure nitrogen, while the absorption signal decreased quickly (in 5 min) to the baseline after switching to compressed air. The adhesion of tin oxide thin films is found to be improved by pre-coating a thin layer of silica gel on the optical fiber. Adhesion increases due to increase interaction of optical fiber surface and the coated silica gel and tin oxide film. Optical absorption spectra of SnO 2 coating doped with 5 wt% MoO 3 were observed to change and red-shifted from 320 nm to 600 nm. SnO 2 thin film promoted with 1 wt% Pt was found to be sensitive to CH 4 containing gas.

Optical fiber ammonia sensing probes using reagent immobilized porous silica coating as transducers

Sensors and Actuators B: Chemical, 2006

... Giuliani et al. [12] used a small piece of silica capillary coated on the inner surface with ... more ... Giuliani et al. [12] used a small piece of silica capillary coated on the inner surface with a laser dye (Oxazine 170) as a transducer for sensing ammonia in air gas. ... In brief, the central part of a conventional silica optical fiber with two ends polished was inserted into a small flame. ...

An active core fiber optic sensor for detecting trace H2S at high temperature using a cadmium oxide doped porous silica optical fiber as a transducer

Sensors and Actuators B: Chemical, 2007

An active core fiber optic sensor has been developed for detecting trace H2S in high-temperature ... more An active core fiber optic sensor has been developed for detecting trace H2S in high-temperature gas samples. This sensor uses a cadmium oxide doped porous silica optical fiber prepared with a sol–gel process as a transducer. When this porous silica optical fiber was exposed to a gas sample at high temperatures, trace H2S in the sample diffuse into the porous

A fiber optic temperature sensor with an epoxy-glue membrane as a temperature indicator

Sensors and Actuators B: Chemical, 2006

A fiber optic temperature sensor for monitoring/detecting ambient temperature ranging from room t... more A fiber optic temperature sensor for monitoring/detecting ambient temperature ranging from room temperature (25 • C) to ∼100 • C has been described. This sensor uses polycyclic aromatic compounds (PAHs) presenting in a commercially available epoxy glue as the temperature indicator. The PAHs in the epoxy glue fluoresce when excited with a UV light source. The intensity of the fluorescence of the PAHs decreases when the epoxy glue is exposed to an environment of higher temperature. Therefore, the reduction of fluorescence signal can be used to indicate temperature. A simple structured optical fiber temperature transducer has been constructed by gluing two silica optical fibers together with the epoxy glue. An optical fiber temperature sensor was built up by connecting one of the fibers to a UV light emitting diode and the other fiber to an optical fiber compatible UV-vis spectrometer. The sensor has been tested for monitoring temperature from room temperature up to 100 • C. The attenuation of the fluorescence intensity of the fiber optic sensor in dB has a linear relationship with temperature in the tested range. In this paper, the principle, fabrication, response characteristics, calibration, stability of this sensor and possible applications of the temperature sensing principle established in this work are discussed.

Optical fiber humidity sensor based on evanescent-wave scattering

Optics Letters, 2004

Testing the light scattering in the porous sol-gel silica coating.. 3.3 Testing the response of t... more Testing the light scattering in the porous sol-gel silica coating.. 3.3 Testing the response of the sol gel silica coated bent fiber probe to moisture…………………………………………… 3.3.1 Testing the sol gel silica coating EWS for moisture sensing…………………………………………………. 3.3.2 Testing the sol gel silica coating EWS and absorption for monitoring low level moisture content .

$1.8 The light transmission of porous silica. The transmission in the graph is the fraction of light intensity transmitted through the porous silica [28]. silica’s amorphous structure. In this region, sol gel silica is an adequate optical material.$

$gel silica satisfy the requirement of total internal reflection. the lower refractive index, total internal reflection occurs. Optical fiber core and the sol$

Nanostructured scintillating optical fiber prepared via sol-gel technique for detecting gamma radiation

Optics Letters, 2009

An innovative scintillating material prepared through distributing cesium iodide (CsI) nanocrysta... more An innovative scintillating material prepared through distributing cesium iodide (CsI) nanocrystals into pores of a transparent nanoporous silica using a sol-gel technology has been developed. The CsI nanocrystals doped porous silica material has been designed and made into an optical fiber by using a patented solgel technique. This CsI-doped sol-gel silica optical fiber was conveniently connected to a highly sensitive photon detector in testing the material for detecting gamma radiation. The preliminary test result reported in this Letter clearly demonstrates the feasibility of this scintillating fiber for detecting high-energy radiations.

ICP原子発光分析におけるin situ化学反応による新規な試料導入法の開発とその応用

Bunseki kagaku, 1996

Optical-Fiber Sensor Using Tailored Porous Sol-Gel Fiber Core

IEEE Sensors Journal, 2004

Since 1975, he has worked on the development of lasers and their applications. He has over 106 re... more Since 1975, he has worked on the development of lasers and their applications. He has over 106 referred publications. His research interests include lasers, laser spectroscopy, optical-fiber sensors, electronics, molecular dynamics, laser diagnostics for combustion, laser ultrasonics, and hazardous waste management. Dr. Singh is a member of the SPIE, OSA, AIAA, ACS, ISA, and SAS.

$Research paper thumbnail of An Optical Fiber ${\rm H}_{2}{\rm O}_{2}$-Sensing Probe Using a Titanium(IV) Oxyacetylacetonate Immobilized Nafion Coating on an Bent Optical Fiber Probe$

An Optical Fiber ${\rm H}_{2}{\rm O}_{2}$-Sensing Probe Using a Titanium(IV) Oxyacetylacetonate Immobilized Nafion Coating on an Bent Optical Fiber Probe

IEEE Sensors Journal, 2011

An optical fiber sensor technique has been developed for monitoring trace in aqueous solutions. A... more An optical fiber sensor technique has been developed for monitoring trace in aqueous solutions. A titanium(IV) oxyacetylacetonate doped Nafion coating on the surface of a bent optical fiber probe was used as a transducer. Trace in an aqueous solution diffused into the polymer coating reacts with the sensing agent. The resulted product absorbs light with peak absorption wavelength at 360 nm, which is detected by using op- tical fiber evanescent wave absorption spectrometry. This sensor reversibly responses to trace in water, and has a detection limit of . This fiber-optic sensor is immune of interferences from electromagnetic field which makes it useful in proton exchange membrane fuel cell researches.

Development and evaluation of optical fiber NH3 sensors for application in air quality monitoring

Atmospheric Environment, 2013

h i g h l i g h t s < Optical fiber NH 3 sensors have been developed. < The feasibility of using ... more h i g h l i g h t s < Optical fiber NH 3 sensors have been developed. < The feasibility of using the sensors for air quality monitoring has been investigated. < The sensors are reversible, can be used for continuous monitoring NH 3 in air. < The sensors are highly sensitive, can detect NH 3 in ppbv level. < Cross responses of the sensors to moisture, CO 2 and temperature change have been investigated.

Electrochemical vaporization of trace beryllium via in situ alkylation for inductively coupled plasma atomic emission spectrometry

Analytica Chimica Acta, 1994

A novel sample introduction method based on in situ alkylation for inductively coupled plasma ato... more