Abstract
Polymer hydrogels can exhibit large reversible volume changes in response to external stimuli, and thus are regarded as excellent materials for chemical sensors. In this report, we demonstrate a mechanically robust and fast response photonic crystal pH sensor fabricated by templated photo-polymerization of hydrogel monomers within the interstitial space of a self-assembled colloidal photonic crystal. Throughout a rigorous optimization of the photo- polymerization, pH sensors showing a response time of less than 10 s upon a pH change were fabricated. Repeated pH changes revealed that the sensor has a long lifetime (>6 months) without degradation of the response time or reproducibility in pH-driven color change.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 183-190 |
| Number of pages | 8 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 150 |
| Issue number | 1 |
| DOIs | |
| State | Published - Oct 21 2010 |
Keywords
- Fast response
- Hydrogel
- Inverse opal
- pH sensor
- Photonic crystal
ASJC Scopus subject areas
- Instrumentation
- Materials Chemistry
- Surfaces, Coatings and Films
- Metals and Alloys
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering