| Autor: |
Zhong JQ; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA., Wang M; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.; Department of Materials Science and Chemical Engineering, Stony Book University, Stony Brook, New York 11790, USA., Akter N; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.; Department of Materials Science and Chemical Engineering, Stony Book University, Stony Brook, New York 11790, USA., Kestell JD; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA., Boscoboinik AM; Instituto de Fisica Aplicada INFAP-CONICET-Departamento de Fìsica-Universidad Nacional de San Luis, Chacabuco 917-5700-San Luis, Argentina., Kim T; Department of Materials Science and Chemical Engineering, Stony Book University, Stony Brook, New York 11790, USA., Stacchiola DJ; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA., Lu D; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA., Boscoboinik JA; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA. |
| Abstrakt: |
The confinement of noble gases on nanostructured surfaces, in contrast to bulk materials, at non-cryogenic temperatures represents a formidable challenge. In this work, individual Ar atoms are trapped at 300 K in nano-cages consisting of (alumino)silicate hexagonal prisms forming a two-dimensional array on a planar surface. The trapping of Ar atoms is detected in situ using synchrotron-based ambient pressure X-ray photoelectron spectroscopy. The atoms remain in the cages upon heating to 400 K. The trapping and release of Ar is studied combining surface science methods and density functional theory calculations. While the frameworks stay intact with the inclusion of Ar atoms, the permeability of gasses (for example, CO) through them is significantly affected, making these structures also interesting candidates for tunable atomic and molecular sieves. These findings enable the study of individually confined noble gas atoms using surface science methods, opening up new opportunities for fundamental research. |
