Abstract
In order to fabricate efficient pH optical sensors, the characteristic features of the UV–vis spectra of six synthesized hydroxyazobenzene dyes were studied at different pH(s). Two optical pH sensors were developed using 4-[( p-nitrophenyl)azo]phenol and 2-methoxy-4-[(4-nitrophenyl)azo]phenol dyes immobilized on transparent triacetylcellulose (TAC) membrane, which showed reversible responses within the dynamic ranges of 8.5–10.5 and 6.5–8.5, respectively. A new optical pH sensor with a linear response over a range of 4.5 pH units (7–11.5) was also developed by immobilization of a mixture of the aforementioned dyes on a TAC membrane. All the fabricated optodes showed fast response time (less than 20 s), sharp and clear color change as well as excellent long-term stability (at least 3 months) under the applied conditions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
