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Surface functionality and optical properties impact of phenol red dye on mesoporous silica matrix for fiber optic pH sensing

Islam, Shumaila and Bakhtiar, Hazri and Naseem, Shahzad and Abd. Aziz, Muhammad Safwan and Bidin, Noriah and Riaz, Saira and Ali, Jalil (2018) Surface functionality and optical properties impact of phenol red dye on mesoporous silica matrix for fiber optic pH sensing. Sensors and Actuators, A: Physical, 276 . pp. 267-277. ISSN 0924-4247

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Official URL: http://dx.doi.org/10.1016/j.sna.2018.04.027


Phenol red dye (PR) functionalized mesoporous silica matrix nano-structures/ nano-tubes (MSNs) are synthesized by sol-gel method for pH sensing. FE-SEM analysis revealed formation of different nano-objects (i.e. nano-clusters and nano-tubes) with defined pores, which are arranged into bunch of nanotubes after PR encapsulation. AFM analysis shows the crack-free dense matrices films with low average surface roughness and thickness. XRD and FT–IR exhibited the interaction/bonding of phenolic anchoring groups of PR with silica. HRTEM analysis confirms the formation of crystalline nano-tubes after PR encapsulation within silica matrix. TGA/DTA analysis shows PR dye interacts efficiently within the silica matrix species from 300 °C - 1000 °C. N2 adsorption isotherms confirms the meso-porous nature of the PR encapsulated silica matrix have high surface area value of 434 m2/g with a pore volume of 0.96 cm3/g. UV–vis analysis exhibited that silica matrix has transmission of 84% at 550 nm and 1.36 refractive index. However, transmission is reduced to 79% whilst refractive index increased to 1.37 at 550 nm after PR encapsulation. Coated fiber optic displayed dynamic range of 1–10 pH with fast response time (<50 s). In conclusion, these structural, physicochemical, thermal and optical characteristics of synthesized PR encapsulated silica matrix film could serve as a prototype sensing device model leading to functional benefits in pH stimuli response behavior of opto-chemical devices and optical characteristics.

Item Type:Article
Uncontrolled Keywords:Optical characteristics, pH sensing
Subjects:Q Science > QC Physics
ID Code:85007
Deposited By: Widya Wahid
Deposited On:29 Feb 2020 13:19
Last Modified:29 Feb 2020 13:19

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