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Optical detection of ammonia in water using integrated up-conversion fluorescence in a fiberized microsphere

Optical detection of ammonia in water using integrated up-conversion fluorescence in a fiberized microsphere
Optical detection of ammonia in water using integrated up-conversion fluorescence in a fiberized microsphere
A novel optical sensor for ammonia concentration in water is demonstrated using up-conversion (UC) fluorescence intensity ratio (FIR). The sensor element consists of (i) an Er 3+ -Yb 3+ co-doped tellurite glass microsphere integrated inside a section of suspended tri-core hollow fiber (STCHF) and (ii) the pH indicator phenol red. When 980 nm pump is coupled into the microsphere, the Er 3+ ions produce green and red UC emissions. Exposure to ammonia results in a strong increase in the 560 nm absorption of the phenol red, which acts as a filter for the green emission, while the red emission is unaffected. A simple linear relation between the FIR and the ammonia aqueous concentration has been established.
Integrated device, Microsphere, Optical ammonia sensor, Up-conversion
0733-8724
7303 - 7306
Zhang, M.
e4ab68e1-4890-4c79-9301-f0cc8dda8298
Wang, R.
d5a51dbb-3a55-4943-8827-7e9b1a79aa14
Tian, K.
1043e920-6272-48d2-85ee-a5811ee23eed
Yu, J.
f0cc5bca-6305-4361-9b00-67975b8a1d2e
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Yuan, L.
38c36754-a315-4175-b1a2-e0add1ab6b5c
Wang, P.
df957848-e6e4-45f0-ba01-2d966a30aa67
Zhang, M.
e4ab68e1-4890-4c79-9301-f0cc8dda8298
Wang, R.
d5a51dbb-3a55-4943-8827-7e9b1a79aa14
Tian, K.
1043e920-6272-48d2-85ee-a5811ee23eed
Yu, J.
f0cc5bca-6305-4361-9b00-67975b8a1d2e
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Yuan, L.
38c36754-a315-4175-b1a2-e0add1ab6b5c
Wang, P.
df957848-e6e4-45f0-ba01-2d966a30aa67

Zhang, M., Wang, R., Tian, K., Yu, J., Brambilla, Gilberto, Yuan, L. and Wang, P. (2021) Optical detection of ammonia in water using integrated up-conversion fluorescence in a fiberized microsphere. Journal of Lightwave Technology, 39 (22), 7303 - 7306. (doi:10.1109/JLT.2021.3111829).

Record type: Article

Abstract

A novel optical sensor for ammonia concentration in water is demonstrated using up-conversion (UC) fluorescence intensity ratio (FIR). The sensor element consists of (i) an Er 3+ -Yb 3+ co-doped tellurite glass microsphere integrated inside a section of suspended tri-core hollow fiber (STCHF) and (ii) the pH indicator phenol red. When 980 nm pump is coupled into the microsphere, the Er 3+ ions produce green and red UC emissions. Exposure to ammonia results in a strong increase in the 560 nm absorption of the phenol red, which acts as a filter for the green emission, while the red emission is unaffected. A simple linear relation between the FIR and the ammonia aqueous concentration has been established.

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Optical detection of ammonia in water using integrated up-conversion fluorescence in a fiberized microsphere - Accepted Manuscript
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More information

Accepted/In Press date: 7 September 2021
Published date: 10 September 2021
Keywords: Integrated device, Microsphere, Optical ammonia sensor, Up-conversion

Identifiers

Local EPrints ID: 453226
URI: http://eprints.soton.ac.uk/id/eprint/453226
ISSN: 0733-8724
PURE UUID: 64030290-07db-4b80-bcfc-b4ecbf45d38f
ORCID for Gilberto Brambilla: ORCID iD orcid.org/0000-0002-5730-0499

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Date deposited: 11 Jan 2022 17:39
Last modified: 28 Apr 2022 01:48

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Contributors

Author: M. Zhang
Author: R. Wang
Author: K. Tian
Author: J. Yu
Author: L. Yuan
Author: P. Wang

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