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Graphene-Based Ion-Selective Field-Effect Transistor for Sodium Sensing
| Content Provider | MDPI |
|---|---|
| Author | Huang, Ting Yeung, Kan Kan Li, Jingwei Sun, Honglin Alam, Masruck Gao, Zhaoli |
| Copyright Year | 2022 |
| Description | Field-effect transistors have attracted significant attention in chemical sensing and clinical diagnosis, due to their high sensitivity and label-free operation. Through a scalable photolithographic process in this study, we fabricated graphene-based ion-sensitive field-effect transistor (ISFET) arrays that can continuously monitor sodium ions in real-time. As the sodium ion concentration increased, the current–gate voltage characteristic curves shifted towards the negative direction, showing that sodium ions were captured and could be detected over a wide concentration range, from $10^{−8}$ to $10^{−1}$ M, with a sensitivity of 152.4 mV/dec. Time-dependent measurements and interfering experiments were conducted to validate the real-time measurements and the highly specific detection capability of our sensor. Our graphene ISFETs (G-ISFET) not only showed a fast response, but also exhibited remarkable selectivity against interference ions, including $Ca^{2+}$, $K^{+}$, $Mg^{2+}$ and NH_{4}$^{+}$. The scalability, high sensitivity and selectivity synergistically make our G-ISFET a promising platform for sodium sensing in health monitoring. |
| Starting Page | 2620 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano12152620 |
| Journal | Nanomaterials |
| Issue Number | 15 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-29 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Ion-selective Field-effect Transistor Graphene Sodium Ions Real-time Monitoring |
| Content Type | Text |
| Resource Type | Article |
