Alexander Sinitskii | University of Nebraska-Lincoln (original) (raw)

Papers by Alexander Sinitskii

Faraday Discuss., 2014

Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for elec... more Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for electronic and optoelectronic applications. Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that could yield very narrow GNRs with atomically precise edges. One type of GNRs that has received a considerable attention is the chevron-like GNR with a very distinct periodic structure. Surface-assisted and solution-based synthetic approaches for the chevron-like GNRs have been developed, but their electronic properties have not been reported yet. In this work, we synthesized chevron-like GNRs in bulk by a solution-based method, characterized them by a number of spectroscopic techniques and measured their bulk conductivity. We demonstrate that solution-synthesized chevron-like GNRs are electrically conductive in bulk, which makes them a potentially promising material for applications in organic electronics and photovoltaics.

Chemistry of Materials, 2015

Site-directed electrochemical deposition of pinhole free, low- dielectric thin films on graphene... more Site-directed electrochemical deposition of pinhole free, low- dielectric thin films on graphene is described for the first time. Specifically, we demonstrate the heterogeneous electrochemical polymerization of phenol to form thin (3-4 nm) layers of poly(phenylene oxide) (PPO) on monolayer graphene samples prepared by micromechanical exfoliation and chemical vapor deposition growth. We demonstrate the reliability of depositing PPO films simultaneously on a large number of devices, and selected individual graphene flakes/devices. The performance of top-gated field effect transistor devices described herein demonstrates the utility of electrodeposited PPO films as a top-gate dielectric.

Nature Communications, 2014

According to theoretical studies, narrow graphene nanoribbons with atomically precise armchair ed... more According to theoretical studies, narrow graphene nanoribbons with atomically precise armchair edges and widths of o2 nm have a bandgap comparable to that in silicon (1.1 eV), which makes them potentially promising for logic applications. Different top-down fabrication approaches typically yield ribbons with width 410 nm and have limited control over their edge structure. Here we demonstrate a novel bottom-up approach that yields gram quantities of high-aspect-ratio graphene nanoribbons, which are only B1 nm wide and have atomically smooth armchair edges. These ribbons are shown to have a large electronic bandgap of B1.3 eV, which is significantly higher than any value reported so far in experimental studies of graphene nanoribbons prepared by top-down approaches. These synthetic ribbons could have lengths of 4100 nm and self-assemble in highly ordered few-micrometer-long 'nanobelts' that can be visualized by conventional microscopy techniques, and potentially used for the fabrication of electronic devices.

Chemical Communications, 2014

Large quantities of narrow graphene nanoribbons with edgeincorporated nitrogen atoms can be synth... more Large quantities of narrow graphene nanoribbons with edgeincorporated nitrogen atoms can be synthesized via Yamamoto coupling of molecular precursors containing nitrogen atoms followed by cyclodehydrogenation using Scholl reaction.

Physica B: Condensed Matter, 2007

We report the small angle polarized neutron scattering study of nickel inverse opals, prepared by... more We report the small angle polarized neutron scattering study of nickel inverse opals, prepared by templating colloidal crystals made of polystyrene microspheres. r

Faraday Discuss., 2014

Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for elec... more Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for electronic and optoelectronic applications. Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that could yield very narrow GNRs with atomically precise edges. One type of GNRs that has received a considerable attention is the chevron-like GNR with a very distinct periodic structure. Surface-assisted and solution-based synthetic approaches for the chevron-like GNRs have been developed, but their electronic properties have not been reported yet. In this work, we synthesized chevron-like GNRs in bulk by a solution-based method, characterized them by a number of spectroscopic techniques and measured their bulk conductivity. We demonstrate that solution-synthesized chevron-like GNRs are electrically conductive in bulk, which makes them a potentially promising material for applications in organic electronics and photovoltaics.

Chemistry of Materials, 2015

Site-directed electrochemical deposition of pinhole free, low- dielectric thin films on graphene... more Site-directed electrochemical deposition of pinhole free, low- dielectric thin films on graphene is described for the first time. Specifically, we demonstrate the heterogeneous electrochemical polymerization of phenol to form thin (3-4 nm) layers of poly(phenylene oxide) (PPO) on monolayer graphene samples prepared by micromechanical exfoliation and chemical vapor deposition growth. We demonstrate the reliability of depositing PPO films simultaneously on a large number of devices, and selected individual graphene flakes/devices. The performance of top-gated field effect transistor devices described herein demonstrates the utility of electrodeposited PPO films as a top-gate dielectric.

Nature Communications, 2014

According to theoretical studies, narrow graphene nanoribbons with atomically precise armchair ed... more According to theoretical studies, narrow graphene nanoribbons with atomically precise armchair edges and widths of o2 nm have a bandgap comparable to that in silicon (1.1 eV), which makes them potentially promising for logic applications. Different top-down fabrication approaches typically yield ribbons with width 410 nm and have limited control over their edge structure. Here we demonstrate a novel bottom-up approach that yields gram quantities of high-aspect-ratio graphene nanoribbons, which are only B1 nm wide and have atomically smooth armchair edges. These ribbons are shown to have a large electronic bandgap of B1.3 eV, which is significantly higher than any value reported so far in experimental studies of graphene nanoribbons prepared by top-down approaches. These synthetic ribbons could have lengths of 4100 nm and self-assemble in highly ordered few-micrometer-long 'nanobelts' that can be visualized by conventional microscopy techniques, and potentially used for the fabrication of electronic devices.

Chemical Communications, 2014

Large quantities of narrow graphene nanoribbons with edgeincorporated nitrogen atoms can be synth... more Large quantities of narrow graphene nanoribbons with edgeincorporated nitrogen atoms can be synthesized via Yamamoto coupling of molecular precursors containing nitrogen atoms followed by cyclodehydrogenation using Scholl reaction.

Physica B: Condensed Matter, 2007

We report the small angle polarized neutron scattering study of nickel inverse opals, prepared by... more We report the small angle polarized neutron scattering study of nickel inverse opals, prepared by templating colloidal crystals made of polystyrene microspheres. r