Thermally stable and fast responsive mesoporous cresol red functionalized silica and titania nanomatrices: fiber optic pH sensors
Source abstract
Abstract
Owing to the fast responsive fiber optic pH sensing, silica nanomatrix (SNM) and titania nanomatrix (TNM) are synthesized by the sol–gel method at low temperatures. Cresol red (CR) is immobilized within SNM and TNM for sensing evaluation. Crack-free, crystallinity and porous surfaces with an average particle size of CR-SNM ~45 ± 0.4 nm and CR-TNM ~24 ± 0.4 nm are observed through microscopic analysis. The is observed in CR immobilized matrices. The CR-SNM shows lower roughness ~7 nm, a large surface area ~380 m2/g, thermal stability at ≤400 °C, and a refractive index 1.47. Whereas, CR-TNM revealed high roughness 48 nm, surface area 211 m2/g, and refractive index 1.76. The sensitivity of the CR-SNM coated fiber is estimated at around 52.8 counts/pH which is greater than CR-TNM coated fiber sensitivity 14.53 counts/pH. Moreover, CR-SNM shows response time 0.17 s at pH 12 which is faster than CR-TNM time response 0.48 s.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Analytical Chemistry and Sensors · Mesoporous Materials and Catalysis · Electrochemical sensors and biosensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (20)
Show source-provided references
1. Wang C, Ohodnicki Jr PR, Su X, Keller M, Brown TD, Baltrus JP (2013) Novel silica surface charge density mediated control of the optical properties of embedded optically active materials and its application for fiber optic pH sensing at elevated temperatures. Nanoscale 00:1–3
2. Khanikar T, Singh VK, Sheoran J (2019) A fiber optic refractive index sensor with a high index ZnO overlay. Laser Phys 29:045103. (7pp)10.1088/1555-6611/ab02f6 ↗
3. Mujahid A, Lieberzeit PA, Dickert FL (2010) Chemical sensors based on molecularly imprinted sol-gel materials. Mater 3(4):2196–221710.3390/ma3042196 ↗
4. Guével XL, Schutzmann S, Stella L, Matteis FD, Prosposito P, Casalboni M (2008) Effect of titania content on the optical properties of dye-doped hybrid sol–gel coatings. Optical Mater 31:451–45410.1016/j.optmat.2008.06.009 ↗
5. Wencel D, Abel T, McDonagh C (2014) Optical chemical pH sensors. Anal Chem 86(1):15–2910.1021/ac4035168 ↗
6. Islam S, Bidin N, Riaz S, Naseem S (2017) Self-assembled hierarchical phenolphthalein encapsulated silica nanoparticles: structural, optical and sensing response. Sens Actuators A 266:111–12110.1016/j.sna.2017.09.020 ↗
7. Liberman A, Mendez N, Trogler WC, Kummel AC (2014) Synthesis and surface functionalization of silica nanoparticles for nanomedicine. Surf Sci Rep. 69(2–3):132–15810.1016/j.surfrep.2014.07.001 ↗
8. Akl MA, Youssef AM, Al-Awadhi MM (2013) Adsorption of acid dyes onto bentonite and surfactant-modified bentonite. J Anal Bioanal Tech 4(4):1–7
9. Chen Y, Chen H, Guo L, He Q, Chen F, Zhou J, Feng J, Shi J (2009) Hollow/rattle-type mesoporous nanostructures by a structural difference-based selective etching strategy. ACS Nano 4:529–53910.1021/nn901398j ↗
10. Islam S, Bakhtiar H, Haider Z, Riaz S, Naseem S, Chaudhary K, Suan LP, Usman SS, Aziz MS (2019) BPB dye confined growth of surfactant-assisted mesostructured silica matrix fiber optic sensing tracers. J Saudi Chem Soc 23:427–43810.1016/j.jscs.2018.07.005 ↗
11. Islam S, Bakhtiar H, Bidin N, Salim AA, Riaz S, Krishnan G, Naseem S (2018) Crack-free high surface area silica-titania nanocomposite coating as opto-chemical sensor device. Sens Actuators A 270:153–16110.1016/j.sna.2017.12.063 ↗
12. Nassar EJ, Ciuffi KJ, Ribeiro SJL, Messaddeq Y (2003) Europium incorporated in silica matrix obtained by sol-gel: luminescent materials. Mater Res 6(4)10.1590/S1516-14392003000400023 ↗
13. Chauhan SS, Jasra RV, Sharma AL (2014) Structural, optical, and pH-stimulus response properties of cresol red immobilized nanocomposite silica films derived by a sol-gel process employing different synthetic routes. Ind Eng Chem Res 53:18863–1887210.1021/ie500846z ↗
14. Wang E, Chow K-F, Kwan V, Chin T, Wong C, Bocarsly A (2003) Fast and long term optical sensors for pH based on sol–gels. Analytica Chim Acta 495:45–5010.1016/S0003-2670(03)00904-8 ↗
15. El Nahhal I, Zourab S, Kodeh F, Babonneau F, Hegazy W (2012) Sol–gel encapsulation of cresol red in presence of surfactants. J Sol-Gel Sci Technol 62(2):117–12510.1007/s10971-012-2693-y ↗
16. Dong S, Luo M, Peng G, Cheng W (2008) Broad range pH sensor based on sol–gel entrapped indicators on fibre optic. Sens Actuators B: Chem 129:94–9810.1016/j.snb.2007.07.078 ↗
17. Islam S, Bakhtiar H, Aziz M, Riaz S, Naseem S (2019) Mesoporous anatase based opto-chemical sensor. Mater Sci Semiconductor Process 100:236–24410.1016/j.mssp.2019.05.009 ↗
18. Wu S, Cheng W, Qiu Y, Li Z, Shuang S, Dong C (2010) Fiber optic pH sensor based on mode-filtered light detection. Sens Actuators B 144:255–25910.1016/j.snb.2009.10.058 ↗
19. Ganesh AB, Radhakrishnan TK (2007) Fiber-optic sensors for the estimation of pH within natural biofilms on metals. Sens Actuators B: Chem 123:1107–111210.1016/j.snb.2006.11.027 ↗
20. Li W, Cheng H, Xia M, Yang KC (2013) An experimental study of pH optical sensor using a section of no-core fiber. Sens Actuators A: Phys 199:260–26410.1016/j.sna.2013.06.004 ↗