Development of fibre-optic pH sensor based on silver nanoparticle embedded in silica matrix for high temperature/pressure conditions

Research output: Contribution to conferencePoster

Abstract

Quantifying hydrogen ion concentration of a solution (or pH) has important applications in different industries such as cosmetics, pharmaceuticals, textile, food and beverage, etc. However, it is challenging to maintain and detect accurately pH under conditions of high temperature and pressure (HTHP). At the moment, there is no reliable instrument that is capable of measuring pH at temperatures exceeding 100 oC in oil wells, or at elevated pressure and in the presence of aggressive chemical species.

Recently, surface plasmon resonance property of gold nanoparticles (Np) have been coated on optical fibres to determine the pH of solutions at different temperatures and pressures [1], [2]. The use of silver nanoparticles (AgNp) on fibre optic as a pH sensor in the HTHP environment, however, is yet to be reported. This study focuses on developing a coating of AgNp embedded in silica (SiO2) on optical fibres to be used as a pH sensor in the HTHP environment. In order for this system to be useful in harsh environments, it is expected to have excellent optical and adhesive properties, durability and sensitivity.

Silver nanoparticles embedded in silica was prepared by adding tetraethoxysilane (TEOS) to ethanol, water and silver nitrate, and the pH of the silver nitrate solution was adjusted to 2 using nitric acid. The solution was left to evaporate for gel formation. Glass slides were then dipped into the gel and dried in an oven at 300oC where silver ions reduced to form AgNp. Characterization of the coating using UV/Visible spectrophotometer indicated the formation of silver nanoparticles showing an absorbance peak around 400 nm, which is consistent with what is reported in the literature [3], [4].
Original languageEnglish
Number of pages1
Publication statusAccepted/In press - 2 Apr 2020
EventButler meeting 2020 - Meeting Postponed. - Newcastle University, Newcastle, United Kingdom
Duration: 2 Apr 20202 Apr 2020
https://conferences.ncl.ac.uk/butlermeeting/butlermeeting2020/

Conference

ConferenceButler meeting 2020 - Meeting Postponed.
CountryUnited Kingdom
CityNewcastle
Period2/04/202/04/20
Internet address

Keywords

  • fibre-optics
  • pH sensor
  • silver colloidal particles

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  • Cite this

    Debnath, S., Roy, S., & Chen, Y-C. (Accepted/In press). Development of fibre-optic pH sensor based on silver nanoparticle embedded in silica matrix for high temperature/pressure conditions. Poster session presented at Butler meeting 2020 - Meeting Postponed., Newcastle, United Kingdom.