Photonic porous silicon as a pH sensor
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(Published version)
Date
2014
Authors
Pace, S.
Vasani, R.B.
Zhao, W.
Perrier, S.
Voelcker, N.
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Nanoscale Research Letters, 2014; 9(article no. 420):1-7
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Abstract
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.
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Copyright 2014 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. (http://creativecommons.org/licenses/by/4.0)