| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7141654 | Sensors and Actuators B: Chemical | 2018 | 21 Pages |
Abstract
A novel graphene oxide (GO)-based pH sensor was designed and prepared through covalently attaching a zwitterionic betaine molecule onto a GO surface. This betaine-modified GO (BMGO) exhibited high water solubility and low toxicity. In aqueous media, BMGO displayed increased fluorescence in acidic conditions and decreased fluorescence in basic conditions. BMGO possesses a pH sensing range from 4 to 12 with excellent reversibility, quick response and high stability. With its high sensitivity and robustness, BMGO can be used to monitor the pH of intracellular contents, as demonstrated through cell imaging.
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Authors
Lihua Lu, Chenfu Liu, Guodong Li, Li-Juan Liu, Chung-Hang Leung, Dik-Lung Ma,