| 1. |
- Bastuck, Manuel, et al.
(författare)
-
UV-assisted gate bias cycling in gas-sensitive field-effect transistors
- 2018
-
Ingår i: Proceedings. - Basel Switzerland : MDPI. - 2504-3900. ; 2:13
-
Tidskriftsartikel (refereegranskat)abstract
- Static and dynamic responses of a silicon carbide field-effect transistor gas sensor have been investigated at two different gate biases in several test gases. Especially the dynamic effects are gas dependent and can be used for gas identification. The addition of ultraviolet light reduces internal electrical relaxation effects, but also introduces new, temperature-dependent effects.
|
|
| 2. |
- Rodner, Marius, 1991-, et al.
(författare)
-
A platform for extremely sensitive gas sensing : 2D materials on silicon carbide
- 2018
-
Ingår i: TechConnect Briefs 2018 - Advanced Materials. - : TechConnect. - 9780998878232 ; , s. 101-104
-
Konferensbidrag (refereegranskat)abstract
- 2D materials offer a unique platform for sensing with extreme sensitivity, since minimal chemical interactions cause noticeable changes in the electronic state. An area where this is particularly interesting is environmental monitoring of gases that are hazardous at trace levels. In this study, SiC is used as a base for epitaxial growth of high quality, uniform graphene, and for templated growth of atomically thin layers of platinum, with potential benefits in terms of the ability to operate at higher temperature and to serve as a more robust template for fiinctionalization compared to graphene. Fiinctionalization with nanoparticles allows tuning the sensitivity to specific molecules without damaging the 2D sensor transducer. With this platform we demonstrate detection of nitrogen dioxide, formaldehyde, and benzene at trace concentrations. This, combined with smart sensor signal evaluation allowing fast response times, could allow real-time monitoring of these toxic pollutants at concentrations of relevance to air quality monitoring.
|
|
| 3. |
- Rodner, Marius, 1991-, et al.
(författare)
-
Iron oxide nanoparticle decorated graphene for ultra-sensitive detection of volatile organic compounds
- 2018
-
Ingår i: Proceedings. - Basel Switzerland : MDPI. - 2504-3900. ; 2:13
-
Tidskriftsartikel (refereegranskat)abstract
- It has been found that two-dimensional materials, such as graphene, can be used as remarkable gas detection platforms as even minimal chemical interactions can lead to distinct changes in electrical conductivity. In this work, epitaxially grown graphene was decorated with iron oxide nanoparticles for sensor performance tuning. This hybrid surface was used as a sensing layer to detect formaldehyde and benzene at concentrations of relevance in air quality monitoring (low parts per billion). Moreover, the time constants could be drastically reduced using a derivative sensor signal readout, allowing detection at the sampling rates desired for air quality monitoring applications.
|
|
| 4. |
- Santangelo, Maria Francesca, et al.
(författare)
-
Epitaxial graphene sensors combined with 3D printed microfluidic chip for heavy metals detection
- 2018
-
Ingår i: Proceedings. - Basel Switzerland : MDPI. - 2504-3900. ; 2:13
-
Tidskriftsartikel (refereegranskat)abstract
- Two-dimensional materials may constitute key elements in the development of a sensing platform where extremely high sensitivity is required, since even minimal chemical interaction can generate appreciable changes in the electronic state of the material. In this work, we investigate the sensing performance of epitaxial graphene on Si-face 4H-SiC (EG/SiC) for liquid-phase detection of heavy metals (e.g., Pb). The integration of preparatory steps needed for sample conditioning is included in the sensing platform, exploiting fast prototyping using a 3D printer, which allows direct fabrication of a microfluidic chip incorporating all the features required to connect and execute the Lab-on-chip (LOC) functions. It is demonstrated that interaction of Pb2+ ions in water-based solutions with the EG enhances its conductivity exhibiting a Langmuir correlation between signal and Pb2+ concentration. Several concentrations of Pb2+ solutions ranging from 125 nM to 500 µM were analyzed showing good stability and reproducibility over time.
|
|
