Integrated Strategy toward Self-Powering and Selectivity Tuning of Semiconductor Gas Sensors
| Autor: | Michael Moseler, Francisco Hernández Ramírez, Andreas Waag, Leonhard Mayrhofer, Matin Sadat Mohajerani, Martin W. G. Hoffmann, Olga Casals Guillén, Lorenzo Caccamo, Cristian Fàbrega, Juan Daniel Prades García, Hao Shen, Alaaeldin Gad |
|---|---|
| Přispěvatelé: | Universitat de Barcelona, Publica |
| Rok vydání: | 2016 |
| Předmět: |
conductometric gas sensor
Nanostructure Bioengineering Nanotechnology 02 engineering and technology 01 natural sciences 7. Clean energy Oxidizing agent Instrumentation Fluid Flow and Transfer Processes Nanoestructures organic-inorganic hybrid nanostructure self-powered business.industry Chemistry Process Chemistry and Technology 010401 analytical chemistry selectivity Self-assembled monolayer Heterojunction heterostructure Gas detectors Detectors de gasos 021001 nanoscience & nanotechnology Nanostructures 0104 chemical sciences Semiconductor Semiconductors self-assembled monolayer Modulation Power consumption 0210 nano-technology business Selectivity |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 2379-3694 |
| DOI: | 10.1021/acssensors.6b00508 |
| Popis: | Inorganic conductometric gas sensors struggle to overcome limitations in high power consumption and poor selectivi-ty. Herein, recent advances in developing self-powered gas sensors with tunable selectivity are introduced. Alternative general approaches for powering gas sensors were realized via proper integration of complementary functionalities (namely; powering and sensing) in a singular heterostructure. These solar light driven gas sensors operating at room temperature without applying any additional external powering sources are comparatively discussed. The TYPE-1 gas sensor based on integration of pure inorganic interfaces (e.g. CdS/n-ZnO/p-Si) is capable of delivering a self-sustained sensing response, while it shows a non-selective interaction towards oxidizing and reducing gases. The structural and the optical merits of TYPE-1 sensor are investigated giving more insights into the role of light activation on the modu-lation of the self-powered sensing response. In the TYPE-2 sensor, the selectivity of inorganic materials is tailored through surface functionalization with self-assembled organic monolayers (SAMs). Such hybrid interfaces (e.g. SAMs/ZnO/p-Si) have specific surface interactions with target gases compared to the non-specific oxidation-reduction interactions governing the sensing mechanism of simple inorganic sensors. The theoretical modeling using density functional theory (DFT) has been used to simulate the sensing behavior of inorganic/organic/gas interfaces, revealing that the alignment of organic/gas frontier molecular orbitals with respect to the inorganic Fermi level is the key factor for tuning selectivity. These platforms open new avenues for developing advanced energy-neutral gas sensing devices and concepts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|