Fabrication and characterization of TiO 2 coated cone shaped nano-fiber pH sensor

Pathak, Akhilesh Kumar; Bhardwaj, Vanita; Gangwar, Rahul Kumar; De, Moutusi; Singh, Vinod Kumar

doi:10.1016/j.optcom.2016.11.021

Cited by 43 publications

(9 citation statements)

References 23 publications

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“…Prolonged exposures to BTB-contaminated water may even lead to organ damage . A review of the recent literature shows that BTB has been employed in the development of pH sensors as well. , These considerations laid the basis of our choice of ARS and BTB as model dye contaminants.…”

Section: Results and Discussionmentioning

confidence: 99%

Utilization of Biomass Fly Ash for Improving Quality of Organic Dye-Contaminated Water

et al. 2020

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Development of innovative methodologies to convert biomass ash into useful materials is essential to sustain the growing use of biomass for energy production. Herein, a simple chemical modification approach is employed to functionalize biomass fly ash (BFA) with 3-aminopropyltriethoxy silane (APTES) to develop an inexpensive and efficient adsorbent for water remediation. The amine-functionalized BFA (BFA−APTES) was fully characterized by employing a range of characterization techniques. Adsorption behavior of BFA−APTES was evaluated against two anionic dyes, namely, alizarin red S (ARS) and bromothymol blue (BTB). In the course of experimental data analysis, the computation tools of data fitting for linear and nonlinear form of Langmuir, Freundlich, and the modified Langmuir−Freundlich adsorption isotherms were used with the aid of Matlab R2019b. In order to highlight the misuse of linearization of adsorption models, the sum of the squares of residues (SSE) values obtained from nonlinear models are compared with R 2 values obtained from the linear regression. The accuracy of the data fitting was checked by the use of SSE as an error function instead of the coefficient of determination, R 2 . The dye adsorption capacity of BFA−APTES was also compared with the nonfunctionalized BFA. The maximum adsorption capacities of BFA−APTES for ARS and BTB dye molecules were calculated to be around 13.42 and 15.44 mg/g, respectively. This value is approximately 2−3 times higher than the pristine BFA. A reasonable agreement between the calculated and experimental values of q e obtained from the nonlinear form of kinetic models verified the importance of using equations in their original form. The experimentally calculated thermodynamic parameters including molar standard Gibbs free energy (Δ ad G m 0 ) and molar standard enthalpy change (Δ ad H m 0 ) reflected that the process of adsorption of dye molecules on the BFA−APTES adsorbent was spontaneous and exothermic in nature. Moreover, the used BFA−APTES adsorbent could be regenerated and reused for several cycles with significant dye adsorption capacity. The remediation capability of the BFA− APTES adsorbent against ARS dye was also demonstrated by packing a small column filled with the BFA−APTES adsorbent and passing a solution of ARS through it. Overall, we provide a simple and scalable route to convert BFA into an efficient adsorbent for water remediation applications.

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Section: Results and Discussionmentioning

confidence: 99%

Utilization of Biomass Fly Ash for Improving Quality of Organic Dye-Contaminated Water

et al. 2020

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“…In this case, a pH sensor based on fiber optic technology can be a preferable choice due to its small size, accurate measurement, immunity to electromagnetic disturbance and durability to harsh environments [2]. So far, several fiber optic based pH sensors have been reported with different sensing techniques such as interferometric [3][4][5], change of the refractive index [6][7][8] or fluorometric [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Bio-Compatible Fiber Optic pH Sensor Based on a Thin Core Interferometric Technique

et al. 2019

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There is an increasing demand for compact, reliable and versatile sensor concepts for pH-level monitoring within several industrial, chemical as well as bio-medical applications. Many pH sensors concepts have been proposed, however, there is still a need for improved sensor solutions with respect to reliability, durability and miniaturization but also for multiparameter sensing. Here we present a conceptual verification, which includes theoretical simulations as well as experimental evaluation of a fiber optic pH-sensor based on a bio-compatible pH sensitive material not previously used in this context. The fiber optic sensor is based on a Mach-Zehnder interferometric technique, where the pH sensitive material is coated on a short, typically 20-25 mm thin core fiber spliced between two standard single mode fibers. The working principle of the sensor is simulated by using COMSOL Multiphysics. The simulations are used as a guideline for the construction of the sensors that have been experimentally evaluated in different liquids with pH ranging from 1.95 to 11.89. The results are promising, showing the potential for the development of bio-compatible fiber optic pH sensor with short response time, high sensitivity and broad measurement range. The developed sensor concept can find future use in many medical- or bio-chemical applications as well as in environmental monitoring of large areas. Challenges encountered during the sensor development due to variation in the design parameters are discussed.

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“…Titanium dioxide films possess a good reflectivity in the near infrared (NIR) region [19], making it an interesting material for the improvement of Fabry-Perot interferometer-based sensors [20,21]. Moreover, TiO 2 is capable of gas and water adsorption, particularly in TiO 2 with the anatase phase [22], allowing for humidity, gas, or pH sensing [22][23][24]. Other important properties of TiO 2 are its high dielectric constants and high refractive index, which enhances light confinement, improving the performance of evanescent field-based sensors [25] as well as shifting the resonance wavelength of surface plasmon resonance (SPR) sensors towards the NIR region [26].…”

Section: Introductionmentioning

confidence: 99%

Sputtering Deposition of TiO2 Thin Film Coatings for Fiber Optic Sensors

et al. 2022

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Thin films of titanium dioxide (TiO2) and titanium (Ti) were deposited onto glass and optical fiber supports through DC magnetron sputtering, and their transmission was characterized with regard to their use in optical fiber-based sensors. Deposition parameters such as oxygen partial pressure, working pressure, and sputtering power were optimized to attain films with a high reflectance. The films deposited on glass supports were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Regarding the deposition parameters, all three parameters were tested simultaneously, changing the working pressure, the sputtering power, and the oxygen percentage. It was possible to conclude that a lower working pressure and higher applied power lead to films with a higher reflectance. Through the analysis of the as-sputtered thin films using X-ray diffraction, the deposition of both Ti and TiO2 films was confirmed. To study the applicability of TiO2 and Ti in fiber sensing, several thin films were deposited in single mode fibers (SMFs) using the sputtering conditions that revealed the most promising results in the glass supports. The sputtered TiO2 and Ti thin films were used as mirrors to increase the visibility of a low-finesse Fabry–Perot cavity and the possible sensing applications were studied.

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Fabrication and characterization of TiO 2 coated cone shaped nano-fiber pH sensor

Cited by 43 publications

References 23 publications

Utilization of Biomass Fly Ash for Improving Quality of Organic Dye-Contaminated Water

Utilization of Biomass Fly Ash for Improving Quality of Organic Dye-Contaminated Water

A Bio-Compatible Fiber Optic pH Sensor Based on a Thin Core Interferometric Technique

Sputtering Deposition of TiO2 Thin Film Coatings for Fiber Optic Sensors

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