Fluorescence ratiometric optical broad range pH sensor based on CdSe/ZnS quantum dots and O170 embedded in ethyl cellulose matrix

Cheng-Shane Chu; Chih-Jen Su

doi:10.1117/12.2255803

23 April 2017 Fluorescence ratiometric optical broad range pH sensor based on CdSe/ZnS quantum dots and O170 embedded in ethyl cellulose matrix

Cheng-Shane Chu, Chih-Jen Su

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103231L (2017) https://doi.org/10.1117/12.2255803
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

This paper presents a ratiometric optical broad range pH sensor that comprises an optical fiber coated at one end with CdSe/ZnS quantum dots (QDs) and Oxazine 170 perchlorate (O170) embedded in ethyl cellulose (EC) matrix. The feasibility of coating an optical fiber with the sensing film to fabricate a ratiometric fiber optic broad range pH sensor is investigated. Using an LED with a central wavelength 405 nm as an excitation light source, the CdSe/ZnS QDs shows that the emission wavelength at 575 nm highly sensitive to pH and O170 shows the emission wavelength at 655 nm insensitive to pH. The ratio of fluorescence intensities at 575 nm and 655 nm has a linear relationship with pH in the 0.9–12.2 range. The ratiometric sensing approach presented in this study has the advantage of suppressing spurious fluctuations in the intensity of the excitation source and optical transmission properties of the optical fiber sensor.

Citation Download Citation

Cheng-Shane Chu and Chih-Jen Su "Fluorescence ratiometric optical broad range pH sensor based on CdSe/ZnS quantum dots and O170 embedded in ethyl cellulose matrix", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103231L (23 April 2017); https://doi.org/10.1117/12.2255803

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available