Photonic porous silicon as a pH sensor

Stephanie Pace, Roshan B. Vasani, Wei Zhao, Sébastien Perrier, Nicolas H. Voelcker

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)


Chronic wounds do not heal within 3 months, and during the lengthy healing process, the wound is invariably exposed to bacteria, which can colonize the wound bed and form biofilms. This alters the wound metabolism and brings about a change of pH. In this work, porous silicon photonic films were coated with the pH-responsive polymer poly(2-diethylaminoethyl acrylate). We demonstrated that the pH-responsive polymer deposited on the surface of the photonic film acts as a barrier to prevent water from penetrating inside the porous matrix at neutral pH. Moreover, the device demonstrated optical pH sensing capability visible by the unaided eye.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Issue number1
Publication statusPublished - 2014
Externally publishedYes


  • Color change sensor
  • pH-responsive polymer
  • Porous silicon
  • RAFT polymerization

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