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Title: Integrated Strategy toward Self-Powering and Selectivity Tuning of Semiconductor Gas Sensors
Author: Gad, Alaaeldin
Hoffmann, Martin W. G.
Casals Guillén, Olga
Mayrhofer, Leonhard
Fábrega, Cristian
Caccamo, Lorenzo
Hernández Ramírez, Francisco
Mohajerani, Matin S.
Moseler, Michael
Shen, Hao
Waag, Andreas
Prades García, Juan Daniel
Keywords: Detectors de gasos
Gas detectors
Issue Date: 29-Sep-2016
Publisher: American Chemical Society
Abstract: 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.
Note: Versió postprint del document publicat a:
It is part of: ACS Sensors, 2016, vol.1, num.10, p. 1256–1264
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ISSN: 2379-3694
Appears in Collections:Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Electrònica)

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