We report ZnO inverse opal- and nanowire (NW)-based enzymatic glucose biosensors with extended linear detection ranges. The ZnO inverse opal sensors have 0.01-18 mM linear detection range, which is 2.5 times greater than that of ZnO NW sensors and 1.5 times greater than that of other reported ZnO sensors. This larger range is because of reduced glucose diffusivity through the inverse opal geometry. The ZnO inverse opal sensors have an average sensitivity of 22.5 μA/(mM cm2), which diminished by 10% after 35 days, are more stable than ZnO NW sensors whose sensitivity decreased by 10% after 7 days.
Bibliographical noteFunding Information:
This work was supported by the Seoul R&BD Program (No. 10920) and by the National Research Foundation of Korea (NRF) by Korea Ministry of Education, Science and Technology (Grant No. 2012-0002028) and Korea Ministry of Environment (Grant No. GT-11-G-02-001-1).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)