Abstract
Bromocresol purple (CPR) and chlorophenol red (BCP) encapsulated in the sol-gel matrix were successfully applied to optical response towards aliphatic amines. The sol-gel matrix obtained by acidic hydrolysis of tetraethoxysilane and phenyltriethoxysilane in the presence of selected dyes was further spin-coated onto glass slides. The coating process was repeated as needed. The optical sensors with a single coating and double coatings showed similar long-term stability, but they differed in response times and sensitivities. These sensors' selectivity sequence towards amines is: methylamine > ethylamine > propylamine > butylamine > triethylamine. The response time for methylamine (t95%) is 75 s, and its detection limit is 5, 10-5 M in aqueous solution. The CPR and BCP doped sol-gel sensors showed good reproducibility, with a useful lifetime of four weeks.
| Original language | English (US) |
|---|---|
| Title of host publication | The Sol-Gel Process |
| Subtitle of host publication | Uniformity, Polymers and Applications |
| Publisher | Nova Science Publishers, Inc. |
| Pages | 631-644 |
| Number of pages | 14 |
| ISBN (Print) | 9781617613210 |
| State | Published - 2011 |
All Science Journal Classification (ASJC) codes
- General Chemistry
Keywords
- Aliphatic amines
- Bromocresol purple
- Chloro-phenol red
- Methylamine
- Sol-gel sensors