Optical Technology until the Year 2000: An Historical Overview

Wolfbeis, Otto S.

doi:10.1007/978-3-662-09111-1_1

Cited by 21 publications

(7 citation statements)

References 160 publications

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“…Optical chemical sensors allow the continuous recording of the concentration of chemical species (e.g., O 2 , CO 2 , or several ions) and physical parameters (e.g., pressure, temperature) and therefore several applications have been found. Among the many optical methods that are used for sensing, fluorescence has attracted special attention because it is highly sensitive and versatile 35 …”

Section: Sensing Applicationsmentioning

confidence: 99%

“…Among the many optical methods that are used for sensing, fluorescence has attracted special attention because it is highly sensitive and versatile. 35 In fluorescence, the sample can be both excited and measured optically. Therefore, fluorescence-based sensors, not requiring contact with the medium during measurement, are advantageous compared with contact sensors in applications where electromagnetic noise is strong or it is physically difficult to connect a wire.…”

Section: Sensing Applicationsmentioning

confidence: 99%

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Thermally Activated Delayed Fluorescence in Fullerenes

Baleizão¹,

Berberan‐Santos²

2008

Annals of the New York Academy of Sciences

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This report reviews the thermally activated delayed fluorescence (TADF) displayed by fullerenes. From the analysis of the steady-state data, time-resolved data, or by a combination of both, it is possible to determine several important photophysical parameters of fullerenes. Herein we also cover the development of temperature and oxygen sensors based on the TADF effect exhibited by fullerene C 70 . Despite the work already carried out, knowledge of the photophysics of fullerenes and derivatives is still incomplete, and much remains to be done in this area and in the improvement of sensor systems based on fullerenes.

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Section: Sensing Applicationsmentioning

confidence: 99%

Section: Sensing Applicationsmentioning

confidence: 99%

Thermally Activated Delayed Fluorescence in Fullerenes

Baleizão¹,

Berberan‐Santos²

2008

Annals of the New York Academy of Sciences

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“…Optical sensors have been employed commercially for the determination of pH, heavy metal ions, CO 2 and O 2 gases and clinical parameters such as glucose and bacteria in blood [ 18 ]. Optical pH sensors are used for measurement and control of pH for applications in chemistry [ 10 ], biochemistry [ 19 ], clinical chemistry [ 20 ] and environmental sciences [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

Abu-Thabit

Umar

Ratemi

et al. 2016

Sensors

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Abstract:A new optical pH sensor based on polysulfone (PSU) and polyaniline (PANI) was developed. A transparent and flexible PSU membrane was employed as a support. The electrically conductive and pH-responsive PANI was deposited onto the membrane surface by in situ chemical oxidative polymerization (COP). The absorption spectra of the PANI-coated PSU membranes exhibited sensitivity to pH changes in the range of 4-12, which allowed for designing a dual wavelength pH optical sensor. The performance of the membranes was assessed by measuring their response starting from high pH and going down to low pH, and vice versa. It was found that it is necessary to precondition the sensor layers before each measurement due to the slight hysteresis observed during forward and backward pH titrations. PSU membranes with polyaniline coating thicknesses in the range of «100-200 nm exhibited fast response times of <4 s, which are attributed to the porous, rough and nanofibrillar morphology of the polyaniline coating. The fabricated pH sensor was characterized by a sigmoidal response (R 2 = 0.997) which allows for pH determination over a wide dynamic range. All membranes were stable for a period of more than six months when stored in 1 M HCl solution. The reproducibility of the fabricated optical pH sensors was found to be <0.02 absorption units after one month storage in 1 M HCl solution. The performance of the optical pH sensor was tested and the obtained pH values were compared with the results obtained using a pH meter device.

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“…Optical sensors have been employed commercially for determination of pH, heavy metal ions, CO2 and O2 gases and clinical parameters such as glucose and bacteria in blood [12]. Optical pH sensors are used for measurement and control of pH for applications in chemistry [11], biochemistry [13], clinical chemistry [14,15] and environmental sciences [16].…”

Section: Introductionmentioning

confidence: 99%

<strong>Polyaniline-Coated Polysulfone Membranes as Flexible Optical pH Sensors</strong>

Abu-Thabit

Umar

Ratemi

et al. 2015

Proceedings of 2nd International Electronic Conference on Sensors and Applications

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A new optical pH sensor based on Polysulfone (PSU) and Polyaniline (PANI) was developed. The transparent and flexible PSU membrane was employed as a support. The electrically conductive and pH-responsive PANI was deposited onto the membrane surface by in situ chemical oxidative polymerization (COP). The absorption spectra of the PANI-coated PSU membranes exhibited sensitivity to pH changes in the range of 4-12, which allowed for designing dual wavelength pH optical sensor. The performance and durability of the membranes were assessed by measuring their response starting from high pH and going down to low pH, and vice versa. The effect of synthesis conditions and film thickness were investigated. The effect of the membrane's storage conditions on the reproducibility of the results was also investigated.

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Optical Technology until the Year 2000: An Historical Overview

Cited by 21 publications

References 160 publications

Thermally Activated Delayed Fluorescence in Fullerenes

Thermally Activated Delayed Fluorescence in Fullerenes

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

<strong>Polyaniline-Coated Polysulfone Membranes as Flexible Optical pH Sensors</strong>

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