Abstract
We report on surface-near two-dimensional electron gases in GaAs/AlGaAs heterostructures for application in potential chemical or biochemical sensors in liquid environment. GaAs cap layers of the heterostructures were coated with self-assembled monolayers of 4′-substituted 4-mercaptobiphenyls (MBP), showing stable device performance in physiological (aqueous) buffers. Deposition of MBP with different 4′-substituents led to systematic changes in the lateral resistance, which can be correlated to the electrical potential drop across the established surface dipole layers. Furthermore, the lateral resistance showed a clear dependency on organic solvents with different polarities, suggesting its high sensitivity to the polarity of physisorbed molecules.
| Original language | English |
|---|---|
| Pages (from-to) | 1111-1115 |
| Number of pages | 5 |
| Journal | Physica E: Low-Dimensional Systems and Nanostructures |
| Volume | 21 |
| Issue number | 2-4 |
| DOIs | |
| State | Published - Mar 2004 |
| Externally published | Yes |
| Event | Proceedings of the Eleventh International Conference on Modulation (MSS11) - Nara, Japan Duration: 14 Jul 2003 → 18 Jul 2003 |
Bibliographical note
Funding Information:The authors thank A. Paul for e-beam cross-linking of some of the MBP samples and M.G. Nikolaides for help with the experimental set-up. This work was financially supported by the DFG (SFB563, Ta 259/1) and in part by Fujitsu Labs Europe.
Funding
The authors thank A. Paul for e-beam cross-linking of some of the MBP samples and M.G. Nikolaides for help with the experimental set-up. This work was financially supported by the DFG (SFB563, Ta 259/1) and in part by Fujitsu Labs Europe.
| Funders | Funder number |
|---|---|
| Fujitsu Labs Europe | |
| Deutsche Forschungsgemeinschaft | Ta 259/1, SFB563 |
Keywords
- GaAs
- Heterostructure
- Self-assembled monolayer
- Sensor
- Two-dimensional electron gas