Publications by authors named "Ilya Piskun"
Article Synopsis
- The research focuses on hydrogen-terminated zigzag nanographene and its unique magnetic quantum properties, which are crucial for advancing carbon-based spintronics.
- Zigzag graphene nanoribbons exhibit ferromagnetic edge states that can couple antiferromagnetically across their width, but this magnetic structure has been hard to observe due to interference from the substrate.
- The study introduces a technique to stabilize and isolate these edge states using nitrogen atom dopants, demonstrating significant spin splitting in the electronic structure and paving the way for future applications in nanoscale sensors and logic devices.
Article Synopsis
- The study introduces a hybrid bottom-up synthesis technique called Matrix-Assisted Direct (MAD) transfer for creating graphene nanoribbons (GNRs) that combines the advantages of solution-based and on-surface approaches.
- This method allows for precise control over critical structural properties, translating them effectively into the resulting GNRs.
- The research showcases the synthesis of unique structures such as chevron-type GNRs and nitrogen-doped armchair GNRs, which could not be achieved using conventional synthesis methods alone.
The rational bottom-up synthesis of graphene nanoribbons (GNRs) provides atomically precise control of widths and edges that give rise to a wide range of electronic properties promising for electronic devices such as field-effect transistors (FETs). Since the bottom-up synthesis commonly takes place on catalytic metallic surfaces, the integration of GNRs into such devices requires their transfer onto insulating substrates, which remains one of the bottlenecks in the development of GNR-based electronics. Herein, we report on a method for the transfer-free placement of GNRs on insulators.
View Article and Find Full Text PDFThe integration of substitutional dopants at predetermined positions along the hexagonal lattice of graphene-derived polycyclic aromatic hydrocarbons is a critical tool in the design of functional electronic materials. Here, we report the unusually mild thermally induced oxidative cyclodehydrogenation of dianthryl pyrazino[2,3-]quinoxalines to form the four covalent C-N bonds in tetraazateranthene on Au(111) and Ag(111) surfaces. Bond-resolved scanning probe microscopy, differential conductance spectroscopy, along with first-principles calculations unambiguously confirm the structural assignment.
View Article and Find Full Text PDFArticle Synopsis
- Atomically precise graphene nanoribbons (GNRs) are emerging as key materials for advanced electronics, requiring precise control in their synthesis.
- This study introduces a method for creating chevron-type GNRs using a living chain-growth process, allowing for specific lengths and functional end groups.
- The innovative synthesis technique demonstrated in this research could facilitate the future development of complex electronic devices and specialized GNR structures.
The mechanical stresses that materials experience during use can lead to aging and failure. Recent developments in covalent mechanochemistry have provided a mechanism by which those stresses can be channeled into constructive, rather than destructive, responses, including strengthening in materials. Here, the synthesis and mechanical response of a polymer containing multiple benzocyclobutene (BCB) mechanophores along its backbone are reported.
View Article and Find Full Text PDFThe majority of Sn-mediated cyclizations are reductive and, thus, cannot give a fully conjugated product. This is a limitation in the application of Sn-mediated radical cascades for the preparation of fully conjugated molecules. In this work, we report an oxidatively terminated Bu3Sn-mediated cyclization of an alkyne where AIBN, the commonly used initiator, takes on a new function as an oxidative agent.
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