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

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.

[1]  Dong Liu,et al.  An optical pH sensor with a linear response over a broad range , 2000 .

[2]  Moungi G Bawendi,et al.  A ratiometric CdSe/ZnS nanocrystal pH sensor. , 2006, Journal of the American Chemical Society.

[3]  G. J. Vervelde,et al.  The use of glass electrodes for the measurement of activities of metal ions , 2010 .

[4]  M. C. Pegalajar,et al.  Full-range optical pH sensor array based on neural networks , 2011 .

[5]  Shuwen Dai,et al.  Spectrum optimization of bi-color and tri-color phosphor-converted white LEDs in neutral correlated color temperature system , 2012 .

[6]  I. M. El-Nahhal,et al.  Sol-Gel Thin Films Immobilized with Bromocresol Purple pH-Sensitive Indicator in Presence of Surfactants , 2012 .

[7]  D. J. Graham,et al.  Development of the Glass Electrode and the pH Response , 2013 .

[8]  C. Chu,et al.  Effect of substrate concentration and pH on biohydrogen production kinetics from food industry wastewater by mixed culture , 2013 .

[9]  S. H. Herman,et al.  Bromophenol blue thin film coated fiber optic response towards pH sensing , 2014, 2014 2nd International Conference on Electrical, Electronics and System Engineering (ICEESE).

[10]  A. Sharma,et al.  Structural, Optical, and pH-Stimulus Response Properties of Cresol Red Immobilized Nanocomposite Silica Films Derived by a Sol–Gel Process Employing Different Synthetic Routes , 2014 .

[11]  H. Arida Novel pH microsensor based on a thin film gold electrode modified with lead dioxide nanoparticles , 2014, Microchimica Acta.

[12]  T. Asaka,et al.  Development of a pH sensor based on a nanostructured filter adding pH-sensitive fluorescent dye for detecting acetic acid in photovoltaic modules , 2015 .

[13]  G. F. Guimarães,et al.  pH optical sensor based on thin films of sol–gel with bromocresol purple , 2016 .

[14]  I. M. El-Nahhal,et al.  Sol–gel entrapment of bromothymol blue (BTB) indicator in the presence of cationic 16E1Q and 16E1QS surfactants , 2016, Journal of Sol-Gel Science and Technology.

[15]  Dawei Huang,et al.  An internal reference fluorescent pH sensor with two pH-sensitive fluorophores carrier , 2016 .

[16]  Satsuki Tsuji,et al.  Effects of water pH and proteinase K treatment on the yield of environmental DNA from water samples , 2016, Limnology.

[17]  Krzysztof Zaraska,et al.  Development and characterization of miniaturized LTCC pH sensors with RuO2 based sensing electrodes , 2016 .

[18]  Nedal Y. Abu-Thabit,et al.  A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers , 2016, Sensors.

[19]  Amanpal Singh,et al.  Deposition of ZnO ultrathin films by sol-gel route , 2016, 2016 International Conference on Nanomaterials: Application & Properties (NAP).

[20]  Wang Xuan-jin Application and Analysis of the Orthogonal Test Design , 2016 .

[21]  Peifang Wang,et al.  Effect of UV irradiation on the aggregation of TiO2 in an aquatic environment: Influence of humic acid and pH. , 2016, Environmental pollution.

[22]  Vinod K. Singh,et al.  Fabrication and characterization of TiO 2 coated cone shaped nano-fiber pH sensor , 2017 .

[23]  Vinod Kumar Singh,et al.  No-core fiber-based highly sensitive optical fiber pH sensor , 2017, Journal of biomedical optics.