Investigation of dye-doped sol-gels for ammonia gas sensing

Alvin Persad; Kwok Fan Chow; Wenqun Wang; Enju Wang; Ann Okafor; Neil Jespersen; Jonathan Mann; Andrew Bruce Bocarsly

doi:10.1016/j.snb.2007.08.039

Investigation of dye-doped sol-gels for ammonia gas sensing

Alvin Persad, Kwok Fan Chow, Wenqun Wang, Enju Wang, Ann Okafor, Neil Jespersen, Jonathan Mann, Andrew Bruce Bocarsly

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

Sol-gel films doped with fluorescein (FL) and phenol red (PR) dyes were evaluated for their responses to ammonia gas. In a steady state, the sensors respond to the gas-phase ammonia evolved from ammonium hydroxide solutions in the range of 5 × 10^-6 to 0.05 M for FL-doped gels, and 10^-4 to 1 M for PR-doped gels. The sensors have high selectivity for ammonia against larger amines and moderate selectivity against methyl and ethylamines. The FL-gel exhibits rapid and reproducible response to dry NH₃ gas samples of 9-50 ppm, while PR-gel is insensitive to ammonia in this low concentration range. The life-times of the sensors are over a year.

Original language	English (US)
Pages (from-to)	359-363
Number of pages	5
Journal	Sensors and Actuators, B: Chemical
Volume	129
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2007.08.039
State	Published - Jan 29 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Keywords

Ammonia gas
Fluorescein
Optical sensor
Sol-gel

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10.1016/j.snb.2007.08.039

Cite this

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title = "Investigation of dye-doped sol-gels for ammonia gas sensing",

abstract = "Sol-gel films doped with fluorescein (FL) and phenol red (PR) dyes were evaluated for their responses to ammonia gas. In a steady state, the sensors respond to the gas-phase ammonia evolved from ammonium hydroxide solutions in the range of 5 × 10-6 to 0.05 M for FL-doped gels, and 10-4 to 1 M for PR-doped gels. The sensors have high selectivity for ammonia against larger amines and moderate selectivity against methyl and ethylamines. The FL-gel exhibits rapid and reproducible response to dry NH3 gas samples of 9-50 ppm, while PR-gel is insensitive to ammonia in this low concentration range. The life-times of the sensors are over a year.",

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language = "English (US)",

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T1 - Investigation of dye-doped sol-gels for ammonia gas sensing

AU - Persad, Alvin

AU - Chow, Kwok Fan

AU - Wang, Wenqun

AU - Wang, Enju

AU - Okafor, Ann

AU - Jespersen, Neil

AU - Mann, Jonathan

AU - Bocarsly, Andrew Bruce

PY - 2008/1/29

Y1 - 2008/1/29

N2 - Sol-gel films doped with fluorescein (FL) and phenol red (PR) dyes were evaluated for their responses to ammonia gas. In a steady state, the sensors respond to the gas-phase ammonia evolved from ammonium hydroxide solutions in the range of 5 × 10-6 to 0.05 M for FL-doped gels, and 10-4 to 1 M for PR-doped gels. The sensors have high selectivity for ammonia against larger amines and moderate selectivity against methyl and ethylamines. The FL-gel exhibits rapid and reproducible response to dry NH3 gas samples of 9-50 ppm, while PR-gel is insensitive to ammonia in this low concentration range. The life-times of the sensors are over a year.

AB - Sol-gel films doped with fluorescein (FL) and phenol red (PR) dyes were evaluated for their responses to ammonia gas. In a steady state, the sensors respond to the gas-phase ammonia evolved from ammonium hydroxide solutions in the range of 5 × 10-6 to 0.05 M for FL-doped gels, and 10-4 to 1 M for PR-doped gels. The sensors have high selectivity for ammonia against larger amines and moderate selectivity against methyl and ethylamines. The FL-gel exhibits rapid and reproducible response to dry NH3 gas samples of 9-50 ppm, while PR-gel is insensitive to ammonia in this low concentration range. The life-times of the sensors are over a year.

KW - Ammonia gas

KW - Fluorescein

KW - Optical sensor

KW - Sol-gel

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M3 - Article

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SN - 0925-4005

VL - 129

SP - 359

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JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

IS - 1

ER -

Investigation of dye-doped sol-gels for ammonia gas sensing

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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