Fiber optic pH sensing with long wavelength excitable Schiff bases in the pH range of 7.0–12.0

2007 ◽  
Vol 588 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Sibel Derinkuyu ◽  
Kadriye Ertekin ◽  
Ozlem Oter ◽  
Serpil Denizalti ◽  
Engin Cetinkaya
Keyword(s):  
Schiff Bases ◽  
Fiber Optic ◽  
Ph Sensing ◽  
Long Wavelength ◽  
Ph Range

Emission based fiber optic pH sensing with Schiff bases bearing dimethylamino groups

2008 ◽  
Vol 76 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Sibel Derinkuyu ◽  
Kadriye Ertekin ◽  
Ozlem Oter ◽  
Serpil Denizalti ◽  
Engin Cetinkaya
Keyword(s):  
Schiff Bases ◽  
Fiber Optic ◽  
Ph Sensing

A complementary-DNA-enhanced fiber-optic sensor based on microfiber-assisted Mach-Zehnder interferometry for biocompatible pH sensing

2021 ◽  
Vol 332 ◽  
pp. 129516
Author(s):  
Yujia Wang ◽  
Hao Zhang ◽  
Yunxi Cui ◽  
Shaoxiang Duan ◽  
Wei Lin ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Ph Sensing ◽  
Complementary Dna ◽  
Optic Sensor

scholarly journals TiO2 Nano Flowers Based EGFET Sensor for pH Sensing

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 251
Author(s):  
Chih-Chiang Yang ◽  
Kuan-Yu Chen ◽  
Yan-Kuin Su
Keyword(s):  
Ph Value ◽  
Ph Sensor ◽  
High Sensitivity ◽  
Experimental Result ◽  
Ph Sensing ◽  
Voltage Reference ◽  
Ph Sensors ◽  
Oxide Substrate ◽  
Ph Range ◽  
The Relationship

In this study, pH sensors were successfully fabricated on a fluorine-doped tin oxide substrate and grown via hydrothermal methods for 8 h for pH sensing characteristics. The morphology was obtained by high-resolution scanning electron microscopy and showed randomly oriented flower-like nanostructures. The TiO2 nanoflower pH sensors were measured over a pH range of 2–12. Results showed a high sensitivity of the TiO2 nano-flowers pH sensor, 2.7 (μA)1/2/pH, and a linear relationship between IDS and pH (regression of 0.9991). The relationship between voltage reference and pH displayed a sensitivity of a 46 mV/pH and a linear regression of 0.9989. The experimental result indicated that a flower-like TiO2 nanostructure extended gate field effect transistor (EGFET) pH sensor effectively detected the pH value.

scholarly journals Near-Infrared pH Sensor Based on a SPEEK–Polyaniline Polyelectrolyte Complex Membrane

Proceedings ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 11 ◽  
Author(s):  
Nedal Y. Abu-Thabit
Keyword(s):  
Polyelectrolyte Complex ◽  
Near Infrared ◽  
Response Times ◽  
Oxidative Polymerization ◽  
Ph Sensor ◽  
Ph Sensing ◽  
Ph Values ◽  
Sensing Applications ◽  
Ph Range ◽  
Speek Membrane

A polyelectrolyte complex (PEC) membrane based on sulfonated poly (ether ether ketone) and polyaniline (SPEEK-PANI) was developed for pH sensing applications. Aniline was polymerized in the presence of the SPEEK membrane by using in situ chemical oxidative polymerization to yield an ionically crosslinked SPEEK-PANI membrane. The fabricated membrane exhibited sensitivity in the physiological pH range of 2–8. The PEC membrane pH sensor showed good absorption properties in the near-infrared region (NIR). The membrane showed fast response during a de-doping process (≈90 s), while longer response times are essential for doping processes from the alkaline/neutral pH region to the acidic pH region, which is attributed to the presence of highly acidic sulfonic acid groups with a high buffering capacity in the PEC membrane. The SPEEK-PANI membrane exhibited slightly higher water uptake compared to the neat SPEEK membrane. The membrane exhibited good stability, as it was stored in 1M HCl solution for more than 2 years without physical or visual deterioration. A preconditioning step in 1M HCl ensured that the results were reproducible and allows the pH sensor to be used repeatedly. The PEC sensor membranes are suitable for applications that start at low pH values and move upwards to higher pH values in the 2–8 pH range.

Fiber optic pH sensing system with microscopic spatial resolution

2015 ◽  
Author(s):  
Ondřej Podrazký ◽  
Jan Mrázek ◽  
Soňa Vytykáčová ◽  
Jana Proboštová ◽  
Ivan Kašík
Keyword(s):  
Spatial Resolution ◽  
Fiber Optic ◽  
Ph Sensing ◽  
Sensing System

Long-wavelength InGaAsP light sources and detectors for fiber-optic communications

1979 ◽  
Author(s):  
R. E. Yeats ◽  
S. H. Chiao ◽  
P. D. Wright ◽  
Y. G. Chai ◽  
G. A. Antypas
Keyword(s):  
Fiber Optic ◽  
Light Sources ◽  
Fiber Optic Communications ◽  
Long Wavelength

scholarly journals Optical pH Detection with U-Shaped Fiber-Optic Probes and Absorption Transducers

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jakub Zajíc ◽  
Lenka Traplová ◽  
Vlastimil Matějec ◽  
Marie Pospíšilová ◽  
Ivo Bartoň
Keyword(s):  
Fiber Optic ◽  
Ph Monitoring ◽  
Porous Silica ◽  
Bromothymol Blue ◽  
Small Sample ◽  
Physiological Processes ◽  
Ph Indicators ◽  
Fiber Optic Probes ◽  
Ph Range

In medicine knowledge of pH values can provide us with information not only about the patients’ status but also about physiological processes in the patient’s body. Measurements of pH in small-sample volumes and online pH monitoring in vivo can be employed to obtain such information. For such measurements we have developed and investigated U-shaped fiber-optic probes with immobilized pH indicators in this paper. U-shaped probes with a diameter of about 2 mm were prepared. Three different pH indicators, methyl red, methyl orange, and bromothymol blue, were immobilized in two types of matrices, namely, porous silica (PS) and ethylcellulose (EC), and applied on the U-shaped probes. Changes in spectra of transmitted power were measured and calibration curves were determined from these spectra. It has been found that a working pH range of prepared probes was from 3.1 to 7.6. The maximum sensitivity was about 0.1 1/pH unit. Effects of structural relaxations of detection layers and indicator leaching observed in experiments are discussed.

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