Trace Ammonia Sensors Based on Fluorescent Near-Infrared-Emitting aza-BODIPY Dyes

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Highly sensitive ammonia sensors for environmental monitoring are presented. The sensing materials are based on fluorescent BF2-chelated tetraarylazadipyrromethene dyes (aza-BODIPYs) dyes physically entrapped in polyurethane hydrogels and dispersed in silicone rubber. This layer is covered by a hydrophobic porous Teflon membrane used as an additional proton barrier and light scattering layer. The dual-lifetime referenced (DLR) sensors make use of near-infrared (NIR)-emitting Egyptian blue as a reference material and in combination with optical fibers are read-out via a compact phase-fluorometer. The detectable concentration range can be tuned by the choice of aza-BODIPY dye or/and the hydrogel matrix. The most sensitive sensor has a limit of detection (LOD) of 0.11 μg/L and the upper detectable concentration of 300 μg/L. No cross-sensitivity toward pH is observed. The sensors show remarkable operational stability with no noticeable drift over a period of 2 weeks.

Originalspracheenglisch
Seiten (von - bis)2859-2865
Seitenumfang7
FachzeitschriftAnalytical Chemistry
Jahrgang89
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - 7 Mär 2017

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Ammonia
Coloring Agents
Infrared radiation
Sensors
Fluorometers
Silicone Elastomers
Hydrogels
Polyurethanes
Hydrogel
Polytetrafluoroethylene
Light scattering
Protons
Optical fibers
Membranes
4,4-difluoro-4-bora-3a,4a-diaza-s-indacene
Monitoring

ASJC Scopus subject areas

  • Analytische Chemie

Dies zitieren

Trace Ammonia Sensors Based on Fluorescent Near-Infrared-Emitting aza-BODIPY Dyes. / Strobl, Martin; Walcher, Anna; Mayr, Torsten; Klimant, Ingo; Borisov, Sergey M.

in: Analytical Chemistry, Jahrgang 89, Nr. 5, 07.03.2017, S. 2859-2865.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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