Dye-doped sol-gels for the optical sensing towards aliphatic amines

Wenqun Wang, K. F. Chow, Alvin Persad, Ann Okafor, Andrew Bruce Bocarsly, Neil D. Jespersen, Enju Wang

Research output: Chapter in Book/Report/Conference proceedingChapter


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 languageEnglish (US)
Title of host publicationThe Sol-Gel Process
Subtitle of host publicationUniformity, Polymers and Applications
PublisherNova Science Publishers, Inc.
Number of pages14
ISBN (Print)9781617613210
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • General Chemistry


  • Aliphatic amines
  • Bromocresol purple
  • Chloro-phenol red
  • Methylamine
  • Sol-gel sensors


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