Highly sensitive SnO2 nanowire network gas sensors
In this work we present a methodology for the localized growth of nanowires on prespecified areas of microhotplates that allows to independently adjust the device's resistance and its response to the gas. This is achieved through the fabrication stripes containing the nanowires, with or without...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/198961 |
| Acceso en línea: | https://hdl.handle.net/2445/198961 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanoestructures Detectors de gasos Semiconductors Nanostructures Gas detectors |
| Sumario: | In this work we present a methodology for the localized growth of nanowires on prespecified areas of microhotplates that allows to independently adjust the device's resistance and its response to the gas. This is achieved through the fabrication stripes containing the nanowires, with or without the presence of a gap in the stripe, giving rise that the nanowires bridge the current. The methodology is demonstrated growing SnO2 nanowirebased chemoresistors and the fabricated sensors have been characterized against CO and NO2. The results show the capability of tailoring nanowire stripe sizes from 1 to 100 μm, including empty areas of the same sizes along the sensing material, and a response increase by a factor of up to 500. We attribute the response enhancement to the absence of nucleation seeds in the gap area, where only arching nanowires can allow the current to flow between electrodes. In this way, the current flow along the bridge of nanowires is restricted principally to the surface conduction, which is controlled by the interaction of the nanowires with gases. |
|---|