Tailoring the Surface Chemical Reactivity of Transition-Metal Dichalcogenide PtTe2 Crystals
Authors/Creators
- 1. Fondazione Istituto Italiano di Tecnologia, Graphene Labs, via Morego 30, 16163 Genoa, Italy and Università della Calabria, Dipartimento di Fisica, via ponte Bucci cubo 31/C, 87036 Rende, Cosenza, Italy
- 2. Fondazione Istituto Italiano di Tecnologia,Università della Calabria, Dipartimento di Fisica, via ponte Bucci cubo 31/C, 87036 Rende, Cosenza, Italy
- 3. Department of Physics, National Cheng Kung University, 70101 Tainan, Taiwan
- 4. Consiglio Nazionale delle Ricerche (CNR)- Istituto Officina dei Materiali (IOM), Laboratorio TASC in Area Science Park S.S. 14 Km 163.5 34149 Trieste, Italy
- 5. Fondazione Istituto Italiano di Tecnologia, Graphene Labs, via Morego 30, 16163 Genoa, Italy
- 6. Department of Chemistry, Haiyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea and Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia
Description
By combining experiments and theory, we have investigated the chemical reactions occurring at the surface of PtTe2, a novel type-II Dirac semimetal in the bulk. We find that the undefected pristine surface of PtTe2 bulky crystal is inert toward most common ambient gases (oxygen and water). Conversely, the presence of defects jeopardizes its chemical inertness with the formation of Te oxides. On defected PtTe2, water adsorbs molecularly even at room temperature, while oxygen adsorption is dissociative. However, water decomposition is revealed on PtTe2 with the presence of substitutional carbon atoms. The influence of thickness and spin-orbit coupling on the electronic properties and the chemical stability are also assessed, with a particular emphasis for the monolayer regime.
Files
PtTe2-crystal.pdf
Files
(650.9 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:d698605b2c348604f8dda9193d104ef0
|
650.9 kB | Preview Download |