Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine
The influence of single-layer graphene on top of a SiO2/Si surface on the orientation of nonplanar lead phthalocyanine (PbPc) molecules is studied using two-dimensional grazing incidence X-ray diffraction. The studies indicate the formation of a mixture of polymorphs, i.e., monoclinic and triclinic...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2020-05-01
|
| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.11.66 |
| _version_ | 1819010843580301312 |
|---|---|
| author | K. Priya Madhuri Abhay A. Sagade Pralay K. Santra Neena S. John |
| author_facet | K. Priya Madhuri Abhay A. Sagade Pralay K. Santra Neena S. John |
| author_sort | K. Priya Madhuri |
| collection | DOAJ |
| description | The influence of single-layer graphene on top of a SiO2/Si surface on the orientation of nonplanar lead phthalocyanine (PbPc) molecules is studied using two-dimensional grazing incidence X-ray diffraction. The studies indicate the formation of a mixture of polymorphs, i.e., monoclinic and triclinic forms of PbPc with face-on (lying down) and edge-on (standing up) PbPc orientations, respectively. The formation of monoclinic fractions is attributed to the presence of the graphene layer directing the π interactions between the highly delocalized macrocycles. The competing interfacial van der Waals forces and molecule–molecule interactions lead to the formation of a small fraction of triclinic moieties. The nanoscale electrical characterization of the thin PbPc layer on graphene by means of conducting atomic force microscopy shows enhanced vertical conductance with interconnected conducting domains consisting of ordered monoclinic crystallites through which the charge transfer occurs via tunneling. These results show the importance of a templating layer to induce the formation of a required phase of PbPc suitable for specific device applications. |
| first_indexed | 2024-12-21T01:18:42Z |
| format | Article |
| id | doaj.art-8857a9d75f65414b8a7cc8c9b35c54f6 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-21T01:18:42Z |
| publishDate | 2020-05-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-8857a9d75f65414b8a7cc8c9b35c54f62022-12-21T19:20:43ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862020-05-0111181482010.3762/bjnano.11.662190-4286-11-66Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanineK. Priya Madhuri0Abhay A. Sagade1Pralay K. Santra2Neena S. John3Centre for Nano and Soft Matter Sciences, Jalahalli, Bengaluru 560 013, IndiaLaboratory for Advanced Nanoelectronic Devices, Sir C. V. Raman Research Park, Department of Physics & Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603 203, Tamil Nadu, IndiaCentre for Nano and Soft Matter Sciences, Jalahalli, Bengaluru 560 013, IndiaCentre for Nano and Soft Matter Sciences, Jalahalli, Bengaluru 560 013, IndiaThe influence of single-layer graphene on top of a SiO2/Si surface on the orientation of nonplanar lead phthalocyanine (PbPc) molecules is studied using two-dimensional grazing incidence X-ray diffraction. The studies indicate the formation of a mixture of polymorphs, i.e., monoclinic and triclinic forms of PbPc with face-on (lying down) and edge-on (standing up) PbPc orientations, respectively. The formation of monoclinic fractions is attributed to the presence of the graphene layer directing the π interactions between the highly delocalized macrocycles. The competing interfacial van der Waals forces and molecule–molecule interactions lead to the formation of a small fraction of triclinic moieties. The nanoscale electrical characterization of the thin PbPc layer on graphene by means of conducting atomic force microscopy shows enhanced vertical conductance with interconnected conducting domains consisting of ordered monoclinic crystallites through which the charge transfer occurs via tunneling. These results show the importance of a templating layer to induce the formation of a required phase of PbPc suitable for specific device applications.https://doi.org/10.3762/bjnano.11.66conducting atomic force microscopy (c-afm)lead phthalocyanine (pbpc)molecular orientationsingle-layer graphenesubstrate effecttwo-dimensional grazing incidence x-ray diffraction (2d-gixrd) |
| spellingShingle | K. Priya Madhuri Abhay A. Sagade Pralay K. Santra Neena S. John Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine Beilstein Journal of Nanotechnology conducting atomic force microscopy (c-afm) lead phthalocyanine (pbpc) molecular orientation single-layer graphene substrate effect two-dimensional grazing incidence x-ray diffraction (2d-gixrd) |
| title | Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| title_full | Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| title_fullStr | Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| title_full_unstemmed | Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| title_short | Templating effect of single-layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| title_sort | templating effect of single layer graphene supported by an insulating substrate on the molecular orientation of lead phthalocyanine |
| topic | conducting atomic force microscopy (c-afm) lead phthalocyanine (pbpc) molecular orientation single-layer graphene substrate effect two-dimensional grazing incidence x-ray diffraction (2d-gixrd) |
| url | https://doi.org/10.3762/bjnano.11.66 |
| work_keys_str_mv | AT kpriyamadhuri templatingeffectofsinglelayergraphenesupportedbyaninsulatingsubstrateonthemolecularorientationofleadphthalocyanine AT abhayasagade templatingeffectofsinglelayergraphenesupportedbyaninsulatingsubstrateonthemolecularorientationofleadphthalocyanine AT pralayksantra templatingeffectofsinglelayergraphenesupportedbyaninsulatingsubstrateonthemolecularorientationofleadphthalocyanine AT neenasjohn templatingeffectofsinglelayergraphenesupportedbyaninsulatingsubstrateonthemolecularorientationofleadphthalocyanine |