An optical pH sensor with extended detection range based on fluoresceinamine covalently bound to sol–gel support

2006 ◽  
Vol 84 (1-2) ◽  
pp. 50-55 ◽  
Author(s):  
Hong Dinh Duong ◽  
Ok-Jae Sohn ◽  
Hung T. Lam ◽  
Jong Il Rhee
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Detection Range ◽  
Optical Ph Sensor ◽  
Covalently Bound

scholarly journals Preparation and Optimization of Optical pH Sensor Based on Sol-Gel

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3195 ◽  
Author(s):  
Jianxin Zhang ◽  
Lei Zhou
Keyword(s):  
Hydrochloric Acid ◽  
Cellulose Acetate ◽  
Measurement Accuracy ◽  
Sol Gel ◽  
Ph Sensor ◽  
Bromophenol Blue ◽  
Support Vector ◽  
Detection Range ◽  
Optical Ph Sensor ◽  
Sensitive Membrane

Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate, N,N-dimethylformamide (DMF), indicator, hydrochloric acid, and precursor glue in preparing the sensor-sensitive membrane. The linearity, measurement accuracy, repeatability, stability, and response time of the prepared pH sensor were tested. The measurement results were analyzed using a support vector machine and linear regression. The experimental results show that the optical pH sensor has a measurement accuracy of up to 0.2 pH and better stability and repeatability than the traditional pH glass electrode.

Coumarin-4-Doped Sol-Gel Coating Film as Optical pH Sensor

1995 ◽  
Vol 34 (Part 2, No. 12A) ◽  
pp. L1594-L1596 ◽  
Author(s):  
Yoshihiro Takahashi ◽  
Ryuichi Shimada ◽  
Akinori Maeda ◽  
KenzoKojima ◽  
Hiroshi Ota
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Coating Film ◽  
Optical Ph Sensor

Broad-Range Optical pH Sensor Based on Binary Mixed-Indicator Doped Sol-Gel Film and Application of Artificial Neural Network

2008 ◽  
Vol 41 (17) ◽  
pp. 3113-3123 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Fatemeh Abbasitabar ◽  
Vali Zare-Shahabadi ◽  
Shahabadi ◽  
Morteza Akhond
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Sol Gel ◽  
Ph Sensor ◽  
Gel Film ◽  
Artificial Neural ◽  
Optical Ph Sensor

scholarly journals A Numerical Analysis of Various pH Level for Fiber Optic pH Sensor Based on Bromophenol Blue in Silica

2019 ◽  
Vol 9 (1) ◽  
pp. 18
Author(s):  
Maizatul Zolkapli ◽  
Suhairi Saharudin ◽  
Sukreen Hana Herman ◽  
Wan Fazlida Hanim Abdullah
Keyword(s):  
Fiber Optic ◽  
Sol Gel ◽  
Ph Sensor ◽  
Statistical Technique ◽  
Bromophenol Blue ◽  
Sensing Element ◽  
Detection Range ◽  
Ph Response ◽  
Ph Level ◽  
Ph Range

The fabrication and characterization of an optical fiber pH sensor for the detection range 2 – 7 are described. The sensing element was prepared by coating the uncladded middle portion of a multimode plastic clad silica fiber (PCF) with xerogel film of immobilized bromophenol blue (BPB) prepared by a sol-gel process. The exponential decay of the evanescent wave at the core-cladding interface of the multimode fiber was utilized to determine the pH response.  The objective of this work is to analyze the measurement of the fiber optic sensing probe towards various pH level. The intensity of the absorbance was analyzed using statistical technique (Statistical Package for the Social Sciences, SPSS) to identify the significant pH range that can be used as a reference in developing the sensor instrumentation in the future. pH2 shows the highest significance among all pH values based on the statistical results using error plots.

Optical pH sensor based on sol-gel-doped new luminescent dye

1999 ◽  
Author(s):  
Aleksandra Lobnik ◽  
Karlheinz Niederreiter ◽  
Georg Uray
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Optical Ph Sensor

scholarly journals Optical pH sensor based on polyaniline sol-gel film immobilized with bromothymol blue and phenol red

2016 ◽  
Author(s):  
Norliza Othman ◽  
Wan Fazlida Hanim ◽  
Uzer Mohd Noor ◽  
Sukreen Hana
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Bromothymol Blue ◽  
Phenol Red ◽  
Gel Film ◽  
Optical Ph Sensor

Design and Application of an Optical pH Sensor Based on Thionine Doped Modified Sol–Gel Film

2019 ◽  
Vol 93 (7) ◽  
pp. 1389-1393
Author(s):  
Mahboubeh Vafi ◽  
Gholam Hossein Rounaghi ◽  
Zarrin Es’haghi ◽  
Zahra Moradi
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Gel Film ◽  
Optical Ph Sensor ◽  
Design And Application

Optical pH sensor based on the absorption of antenna generated europium luminescence by bromothymolblue in a sol–gel membrane

2001 ◽  
Vol 74 (1-3) ◽  
pp. 200-206 ◽  
Author(s):  
Aleksandra Lobnik ◽  
Nataša Majcen ◽  
Karlheinz Niederreiter ◽  
Georg Uray
Keyword(s):  
Sol Gel ◽  
Ph Sensor ◽  
Europium Luminescence ◽  
Optical Ph Sensor

scholarly journals Ex-Vivo Measurement of the pH in Aqueous Humor Samples by a Tapered Fiber-Optic Sensor

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5075
Author(s):  
Ondřej Podrazký ◽  
Jan Mrázek ◽  
Jana Proboštová ◽  
Soňa Vytykáčová ◽  
Ivan Kašík ◽  
...  
Keyword(s):  
Cataract Surgery ◽  
Aqueous Humor ◽  
Fiber Optic ◽  
Ex Vivo ◽  
Sol Gel ◽  
Ph Sensor ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Tapered Optical Fiber ◽  
Practical Demonstration

A practical demonstration of pH measurement in real biological samples with an in-house developed fiber-optic pH sensor system is presented. The sensor uses 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) fluorescent dye as the opto-chemical transducer. The dye is immobilized in a hybrid sol-gel matrix at the tip of a tapered optical fiber. We used 405 nm and 450 nm laser diodes for the dye excitation and a photomultiplier tube as a detector. The sensor was used for the measurement of pH in human aqueous humor samples during cataract surgery. Two groups of patients were tested, one underwent conventional phacoemulsification removal of the lens while the other was subjected to femtosecond laser assisted cataract surgery (FLACS). The precision of the measurement was ±0.04 pH units. The average pH of the aqueous humor of patients subjected to FLACS and those subjected to phacoemulsification were 7.24 ± 0.17 and 7.31 ± 0.20 respectively.

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