Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
Articles by Pascal Ruffieux
Zigzag graphene nanoribbons with periodic porphyrin edge extensions - Nature Chemistry
Abstract Graphene nanoribbons (GNRs) with zigzag edges are promising materials for spintronic devices due to tunable bandgaps and spin-polarized edge states. Porphyrins offer complementary benefits such as desirable optoelectronic properties. Here we combine these features in a hybrid system by means of the on-surface synthesis of zigzag-edge GNRs embedded with porphyrins laterally fused along the ribbon backbone.
Spin excitations in nanographene-based antiferromagnetic spin-1/2 Heisenberg chains - Nature Materials
Abstract Antiferromagnetic Heisenberg chains exhibit two distinct types of excitation spectrum: gapped for integer-spin chains and gapless for half-integer-spin chains. However, in finite-length half-integer-spin chains, quantization induces a gap, requiring precise control over sufficiently long chains to study its evolution. Here we create length-controlled spin-1/2 Heisenberg chains by covalently linking Olympicenes—Olympic-ring-shaped magnetic nanographenes.
Tunable topological phases in nanographene-based spin-1/2 alternating-exchange Heisenberg chains - Nature Nanotechnology
Abstract Unlocking the potential of topological order in many-body spin systems has been a key goal in quantum materials research. Despite extensive efforts, the quest for a versatile platform enabling site-selective spin manipulation, essential for tuning and probing diverse topological phases, has persisted.
Charge state-dependent symmetry breaking of atomic defects in transition metal dichalcogenides - Nature Communications
Abstract The functionality of atomic quantum emitters is intrinsically linked to their host lattice coordination. Structural distortions that spontaneously break the lattice symmetry strongly impact their optical emission properties and spin-photon interface. Here we report on the direct imaging of charge state-dependent symmetry breaking of two prototypical atomic quantum emitters in mono- and bilayer MoS2 by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM).
On-surface cyclization of vinyl groups on poly-para-phenylene involving an unusual pentagon to hexagon transformation - Nature Communications
Abstract On-surface synthesis relies on carefully designed molecular precursors that are thermally activated to afford desired, covalently coupled architectures. Here, we study the intramolecular reactions of vinyl groups in a poly-para-phenylene-based model system and provide a comprehensive description of the reaction steps taking place on the Au(111) surface under ultrahigh vacuum conditions.
Dramatic Acceleration of the Hopf Cyclization on Gold(111): From Enediynes to Peri-Fused Diindenochrysene Graphene Nanoribbons
Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Am. Chem. Soc. 2024, XXXX, XXX RETURN TO ARTICLES ASAPPREVArticleNEXT Chenxiao Zhao Nanotech@surfaces Laboratory, Empa−Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland , Dayanni D.
Contacting individual graphene nanoribbons using carbon nanotube electrodes - Nature Electronics
Abstract Graphene nanoribbons synthesized using bottom-up approaches can be structured with atomic precision, allowing their physical properties to be precisely controlled. For applications in quantum technology, the manipulation of single charges, spins or photons is required. However, achieving this at the level of single graphene nanoribbons is experimentally challenging due to the difficulty of contacting individual nanoribbons, particularly on-surface synthesized ones.
Twisted bilayer zigzag-graphene nanoribbon junctions with tunable edge states - Nature Communications
Abstract Stacking two-dimensional layered materials such as graphene and transitional metal dichalcogenides with nonzero interlayer twist angles has recently become attractive because of the emergence of novel physical properties. Stacking of one-dimensional nanomaterials offers the lateral stacking offset as an additional parameter for modulating the resulting material properties.
Inducing Open-Shell Character in Porphyrins through Surface-Assisted Phenalenyl π-Extension
Organic open-shell compounds are extraordinarily attractive materials for their use in molecular spintronics thanks to their long spin-relaxation times and structural flexibility. Porphyrins (Pors) have widely been used as molecular platforms to craft persistent open-shell structures through solution-based redox chemistry.
On-Surface Synthesis of Oligo(indenoindene)
Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Am. Chem. Soc. 2020, XXXX, XXX RETURN TO ARTICLES ASAPPREVCommunicationNEXT Marco Di Giovannantonio* Marco Di Giovannantonio Empa, Swiss Federal Laboratories for Materials Science and Technology, [email protected] Laboratory, 8600 Dübendorf, Switzerland *E-mail: , Qiang Chen, José I. Urgel José I.
Publisher Correction: Topological frustration induces unconventional magnetism in a nanographene
Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-019-0577-9, published online 9 December 2019. In the version of this Letter originally published online, in Fig. 2e and Fig. 3j, “Spin density Bohr magneton (μB)” should have been “Spin density (μB)”, in Fig. 2m, each pair of angular brackets ‘〈 〉’ should have been a ket ‘| 〉’, and, in the caption for Extended Data Fig. 1, ‘n↑ = n↓ + 2’ should have been ‘n↑ = n↓ + 2’. These errors have been corrected in all versions of the Article.
Topological frustration induces unconventional magnetism in a nanographene
Abstract The chemical versatility of carbon imparts manifold properties to organic compounds, where magnetism remains one of the most desirable but elusive1. Polycyclic aromatic hydrocarbons, also referred to as nanographenes, show a critical dependence of electronic structure on the topologies of the edges and the π-electron network, which makes them model systems with which to engineer unconventional properties including magnetism.
On-surface synthesis of polyazulene with 2,6-connectivity
On-surface synthesis of polyazulene with 2,6-connectivity Azulene, the smallest neutral non-alternant aromatic hydrocarbon, serves not only as a prototype for fundamental studies but also a versatile building block for functional materials because of its unique (opto)electronic properties.
On-surface synthesis and characterization of individual polyacetylene chains
Abstract Polyacetylene (PA) comprises one-dimensional chains of sp2-hybridized carbon atoms that may take a cis or trans configuration. Owing to its simple chemical structure and exceptional electronic properties, PA is an ideal system to understand the nature of charge transport in conducting polymers. Here, we report the on-surface synthesis of both cis- and trans-PA chains and their atomic-scale characterization.
Negatively Curved Warped Nanographene Self-Assembled on Metal Surfaces
We report the investigation of a conjugated polycyclic hydrocarbon containing multiple nonbenzenoid rings and exhibiting negative curvature—the warped nanographene C80H30—adsorbed on several noble metal surfaces in an ultrahigh vacuum environment.
On-Surface Hydrogen-Induced Covalent Coupling of Polycyclic Aromatic Hydrocarbons via a Superhydrogenated Intermediate
Abstract The activation, hydrogenation, and covalent coupling of polycyclic aromatic hydrocarbons (PAHs) are processes of great importance in fields like chemistry, energy, biology, or health, among others. So far, they are based on the use of catalysts which drive and increase the efficiency of the thermally- or light-induced reaction. Here, we report on the catalyst-free covalent coupling of non-functionalized PAHs adsorbed on a relatively inert surface in presence of atomic hydrogen.
On-surface synthesis of graphene nanoribbons with zigzag edge topology
Graphene-based nanostructures exhibit electronic properties that are not present in extended graphene. For example, quantum confinement in carbon nanotubes and armchair graphene nanoribbons leads to the opening of substantial electronic bandgaps that are directly linked to their structural boundary conditions. Nanostructures with zigzag edges are expected to host spin-polarized electronic edge states and can thus serve as key elements for graphene-based spintronics.
Atomically precise bottom-up fabrication of graphene nanoribbons
Abstract External IDs PubMed 20651687
Show More
loading
Actions
Is this you?
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.Get in touch with Pascal
Contact Pascal, search articles and posts on X, monitor coverage, and track replies from one place.
Learn more about Muck Rack