Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages
The successful synthesis of endohedral complexes consisting of nanoscale carbon cages that can encapsulate small molecules has been a remarkable accomplishment since these systems are ideal models to investigate how confinement effects can induce changes in structural and electronic properties of en...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Carbon Trends |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667056922000980 |
| _version_ | 1811155477535391744 |
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| author | Pier Luigi Silvestrelli S. Subashchandrabose Abdolvahab Seif Alberto Ambrosetti |
| author_facet | Pier Luigi Silvestrelli S. Subashchandrabose Abdolvahab Seif Alberto Ambrosetti |
| author_sort | Pier Luigi Silvestrelli |
| collection | DOAJ |
| description | The successful synthesis of endohedral complexes consisting of nanoscale carbon cages that can encapsulate small molecules has been a remarkable accomplishment since these systems are ideal models to investigate how confinement effects can induce changes in structural and electronic properties of encapsulated molecular species. We here investigate from first principles screening effects observed when small molecules, characterized by a finite electronic dipole moment, such as HF, LiF, NaCl, and H2O, are encapsulated into different nanoscale cages: C60, C72, B36N36, Be36O36, Li36F36, Li36Cl36, Na36F36, Na36Cl36, and K36Br36. Binding energies and electronic properties, of these complexes have been computed. In particular, detailed analysis of the effective dipole moment of the complexes and of the electronic charge distribution suggests that screening effects crucially depend on the nature of the intramolecular bonds of the cage: screening is maximum in covalent-bond carbon nanocages, while it is reduced in partially-ionic nanocages B36N36 and Be36O36, being very small in the latter cage which turns out to be almost “electrically transparent”. Interestingly, in the case of the ionic-bond nanocages, an antiscreening effect is observed: in fact, due to the relative displacement of positive and negative ions, induced by the dipole moment of the encapsulated molecule, these cages act as dipole-field amplifiers. Our results open the way to the possibility of tuning the dipole moment of nanocages and of generating electrostatic fields at the nanoscale without the aid of external potentials. Moreover, we can expect some transferability of the observed screening effects also to nanotubes and 2D materials. |
| first_indexed | 2024-04-10T04:34:25Z |
| format | Article |
| id | doaj.art-34f9f0122c7643048ffd8b0897a30a84 |
| institution | Directory Open Access Journal |
| issn | 2667-0569 |
| language | English |
| last_indexed | 2024-04-10T04:34:25Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Carbon Trends |
| spelling | doaj.art-34f9f0122c7643048ffd8b0897a30a842023-03-10T04:36:47ZengElsevierCarbon Trends2667-05692023-03-0110100242Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocagesPier Luigi Silvestrelli0S. Subashchandrabose1Abdolvahab Seif2Alberto Ambrosetti3Corresponding author.; Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova 35131, ItalyDipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova 35131, Italy; Centre for Research and Development, Department of Physics, PRIST Deemed University, Thanjavur, Tamilnadu, 613403, IndiaDipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova 35131, ItalyDipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova 35131, ItalyThe successful synthesis of endohedral complexes consisting of nanoscale carbon cages that can encapsulate small molecules has been a remarkable accomplishment since these systems are ideal models to investigate how confinement effects can induce changes in structural and electronic properties of encapsulated molecular species. We here investigate from first principles screening effects observed when small molecules, characterized by a finite electronic dipole moment, such as HF, LiF, NaCl, and H2O, are encapsulated into different nanoscale cages: C60, C72, B36N36, Be36O36, Li36F36, Li36Cl36, Na36F36, Na36Cl36, and K36Br36. Binding energies and electronic properties, of these complexes have been computed. In particular, detailed analysis of the effective dipole moment of the complexes and of the electronic charge distribution suggests that screening effects crucially depend on the nature of the intramolecular bonds of the cage: screening is maximum in covalent-bond carbon nanocages, while it is reduced in partially-ionic nanocages B36N36 and Be36O36, being very small in the latter cage which turns out to be almost “electrically transparent”. Interestingly, in the case of the ionic-bond nanocages, an antiscreening effect is observed: in fact, due to the relative displacement of positive and negative ions, induced by the dipole moment of the encapsulated molecule, these cages act as dipole-field amplifiers. Our results open the way to the possibility of tuning the dipole moment of nanocages and of generating electrostatic fields at the nanoscale without the aid of external potentials. Moreover, we can expect some transferability of the observed screening effects also to nanotubes and 2D materials.http://www.sciencedirect.com/science/article/pii/S2667056922000980FullerenesEndohedral complexesScreening effectDipole-moment calculationFirst principles simulationsDensity functional theory |
| spellingShingle | Pier Luigi Silvestrelli S. Subashchandrabose Abdolvahab Seif Alberto Ambrosetti Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages Carbon Trends Fullerenes Endohedral complexes Screening effect Dipole-moment calculation First principles simulations Density functional theory |
| title | Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages |
| title_full | Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages |
| title_fullStr | Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages |
| title_full_unstemmed | Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages |
| title_short | Screening and antiscreening in fullerene-like cages: Dipole-field amplification with ionic nanocages |
| title_sort | screening and antiscreening in fullerene like cages dipole field amplification with ionic nanocages |
| topic | Fullerenes Endohedral complexes Screening effect Dipole-moment calculation First principles simulations Density functional theory |
| url | http://www.sciencedirect.com/science/article/pii/S2667056922000980 |
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