| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5449838 | Optics Communications | 2017 | 6 Pages |
Abstract
In the present paper a novel cone shaped nano-fiber (CSNF) pH sensor using multi-mode fiber (MMF) has been fabricated and demonstrated. Three different pH indicators, chlorophenol red, bromothymol blue and cresol red with precursor tetraethyl orthosilicate (TEOS) have been used for fabrication of pH sensing layer. A significant enhancement in sensing properties of pH sensor with TiO2 thin film has been observed. The pH sensor with TiO2 thin film shows the quite high sensitivity (1.16Â dBm/pH) as compared to sensor with simple pH coating (0.81Â dBm/pH) at 1550Â nm with a good linear response. Moreover, the sensor with TiO2 film exhibits fast response time of â¼ 25Â s for pH values ranging from 4 to 11 with excellent stability and durability.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
A.K. Pathak, V. Bhardwaj, R.K. Gangwar, M. De, V.K. Singh,