Sol-gel-based optical sensor for the detection of aqueous amines
Abstract
We present an optical sensor for the detection of aqueous amines obtained by incorporating chromoionophore XV (ETHT 4001) into sol-gel thin films. Acid- and base-catalyzed sol-gel processes were studied to prepare stable ormosil layers using various amounts of organically modified sol-gel precursor such asmethyltriethoxysilane (MTriEOS). The sensor layers were coated with a protective layer of microporous white polytetrafluoroethylene (PTFE) in order to prevent interference from ions and ambient light. The measurements were carried out in a flow-through cell in the reflection mode. Acid-catalyzed ormosil layers (pH 1) based on the copolymerization of tetraethoxysilane (TEOS) and MTriEOS did not show any change in signal upon exposure to aqueous amine solutions, while base-catalyzed sensor layers (pH 3 and 13) showed significant changes in signal. The response time (t100) for the base-catalyzedsensor layer L3 (pH 13) upon exposure to different solutions containing 0-608 mmol L-1 aqueous propylamine was 20-30 s, the regeneration time was 70 s and the detection limit was 0.1 mmol L-1. The sensor response was reproducible and reversible. The porous ormosil layers permit dry sensor storage conditions.
Keywords
analizna kemija;optični senzorji;sol-gel tehnologija;določevanje aminov;fluorometrija;analytical chemistry;optical sensors;sol-gel technology;determination of amines;fluorimetry;
Data
| Language: | English |
|---|---|
| Year of publishing: | 2007 |
| Typology: | 1.01 - Original Scientific Article |
| Organization: | UM FS - Faculty of Mechanical Engineering |
| UDC: | 543.4 |
| COBISS: |
11135254
|
| ISSN: | 1618-2642 |
| Views: | 2349 |
| Downloads: | 79 |
| Average score: | 0 (0 votes) |
| Metadata: |
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Other data
| Secondary language: | English |
|---|---|
| Secondary keywords: | analizna kemija;optični senzorji;sol-gel tehnologija;določevanje aminov;fluorometrija; |
| URN: | URN:SI:UM: |
| Pages: | str. 2863-2870 |
| Volume: | ǂVol. ǂ387 |
| Issue: | ǂno. ǂ8 |
| Chronology: | Apr. 2007 |
| ID: | 8718654 |
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