Loading...
Please wait, while we are loading the content...
Similar Documents
Chemistry of Oxygen Ionosorption on SnO2 Surfaces.
| Content Provider | Europe PMC |
|---|---|
| Author | Sopiha, Kostiantyn V. Malyi, Oleksandr I. Persson, Clas Wu, Ping |
| Copyright Year | 2021 |
| Abstract | Ionosorbed oxygenis the key player in reactions on metal-oxidesurfaces. This is particularly evident for chemiresistive gas sensors,which operate by modulating the conductivity of active materials throughthe formation/removal of surface O-related acceptors. Strikingly though,the exact type of species behind the sensing response remains obscureeven for the most common material systems. The paradigm for ab initio modeling to date has been centered around charge-neutralsurface species, ignoring the fact that molecular adsorbates are requiredto ionize to induce the sensing response. Herein, we resolve thisinconsistency by carrying out a careful analysis of all charged O-relatedspecies on three naturally occurring surfaces of SnO2.We reveal that two types of surface acceptors can form spontaneouslyupon the adsorption of atmospheric oxygen: (i) superoxide O2– on the (110) and the (101) surfaces and (ii)doubly ionized O2– on the (100) facet, with theprevious experimental evidence pointing to the latter as the sourceof sensing response. This species has a unique geometry involvinga large displacement of surface Sn, forcing it to attain the coordinationresembling that of Sn2+ in SnO, which seems necessary tostabilize O2– and activate metal-oxide surfacesfor gas sensing. |
| ISSN | 19448244 |
| Journal | ACS Applied Materials & Interfaces |
| Volume Number | 13 |
| PubMed Central reference number | PMC8397246 |
| Issue Number | 28 |
| PubMed reference number | 34251174 |
| e-ISSN | 19448252 |
| DOI | 10.1021/acsami.1c08236 |
| Language | English |
| Publisher | AmericanChemical Society |
| Publisher Date | 2021-07-12 |
| Access Restriction | Open |
| Rights License | Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2021 TheAuthors. Published by AmericanChemical Society |
| Subject Keyword | ionosorption model chemiresistive sensing tin dioxide charged oxygen species surfacechemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Medicine Materials Science |
