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434 results on '"Liljeroth, Peter"'

189. IBM pushes AFM to image molecular structure

Author

Liljeroth, Peter

Subjects
Microcomputer industry, Computer industry, International Business Machines Corp. -- Research, Atomic force microscopy -- Research, Computer industry -- Research
Abstract

Researchers at IBM in Zurich, Switzerland, have captured the 'anatomy' of a molecule using noncontact atomic-force microscopy (AFM), peering through the surrounding electron cloud to capture images 'with unprecedented resolution.' […]

Published
2009

192. Channel Flow Configuration for Studying the Kinetics of Surfactant--Polyelectrolyte Binding.

Author

Carlsson, Sanna, Liljeroth, Peter, and Kontturi, Kyosti

Subjects
*POLYELECTROLYTES, *ELECTROLYTES, *POLYMERS, *BINDING energy, *DYNAMICS, *FINITE element method
Abstract

A novel channel flow configuration was developed and utilized for studying the poly(styrenesulfonate)-cetylpyridinium ion interaction kinetics. The surfactant solution was continuously injected into a flow of polyelectrolyte solution, and the extent of the association reaction was probed at an ion-selective detector electrode. The system was modeled within an analytical approximation, which was tested by a finite-element simulation of the full convective mass transport problem including the homogeneous complexation reaction. The results show that association kinetics can be resolved and that the initial steps of the reaction are not influenced by intermolecular interactions between the bound surfactants. The presented methodology is general, and further development should enable the study of complex cooperative kinetics of surfactant-polyelectrolyte systems. [ABSTRACT FROM AUTHOR]

Published
2005
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193. Lipophilicity of ions electrogenerated at a Pt coated micropipette supported liquid–liquid interface

Author

Liljeroth, Peter, Quinn, Bernadette M., and Kontturi, Kyösti

Subjects
*CHARGE exchange, *ELECTROLYSIS, *MICROPIPETTES
Abstract

A novel method to readily determine the lipophilicity of electrogenerated charged species is reported. This is achieved by local electrolysis at a Pt coated micropipette and, subsequently, driving the electrogenerated species to transfer across the liquid–liquid interface supported at the tip of the micropipette under potential control. The formal potential of ion transfer can then be used to give a measure of its relative lipophilicity. The method proposed is facile and enables the study of potentially unstable charged products of electron transfer reactions. [Copyright &y& Elsevier]

Published
2002
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194. A layered unconventional superconductor

Author

Lado, Jose L. and Liljeroth, Peter

Abstract

Most systems exhibiting topological superconductivity are artificial structures that require precise engineering. Now, a layered material shows tantalizing signs of the phenomenon.

Published
2021
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195. Integrating Bayesian Inference with Scanning Probe Experiments for Robust Identification of Surface Adsorbate Configurations (Adv. Funct. Mater. 32/2021).

Author

Järvi, Jari, Alldritt, Benjamin, Krejčí, Ondřej, Todorović, Milica, Liljeroth, Peter, and Rinke, Patrick

Subjects
ADSORBATES, ARTIFICIAL intelligence, ATOMIC force microscopy
Abstract

Integrating Bayesian Inference with Scanning Probe Experiments for Robust Identification of Surface Adsorbate Configurations (Adv. Funct. Atomic force microscopy, Bayesian inference, density-functional theory, organic surface adsorbates, structure search Keywords: atomic force microscopy; Bayesian inference; density-functional theory; organic surface adsorbates; structure search EN atomic force microscopy Bayesian inference density-functional theory organic surface adsorbates structure search 1 1 1 08/12/21 20210809 NES 210809 B Bayesian Inference b In article number 2010853, Patrick Rinke and co-workers combine artificial intelligence enhanced ab-initio structure search with atomic force microscopy simulations (SIM) and experiments (EXP) to detect configurations of bulky 3D adsorbates. [Extracted from the article]

Published
2021
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196. Moiré-Enabled Topological Superconductivity

Author

Kezilebieke, Shawulienu, Vaňo, Viliam, Huda, Md N., Aapro, Markus, Ganguli, Somesh C., Liljeroth, Peter, and Lado, Jose L.

Abstract

The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moiré patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moiré pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moiré. The magnetic moiré pattern gives rise to Yu–Shiba–Rusinov minibands and periodic modulation of the Majorana edge modes that we detect using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Moiré patterns and, more broadly, periodic potential modulations are powerful tools to overcome the conventional constraints for realizing and controlling topological superconductivity.

Published
2022
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197. Single-molecule chemistry: Knowing your neighbours.

Author

Liljeroth, Peter

Subjects
*SCANNING tunneling microscopy, *PORPHYCENES, *MOLECULES, *COPPER surfaces, *TAUTOMERISM, *ADATOMS
Abstract

The article reports on the study conducted by Leonhard Grill and co-workers which uses scanning tunneling microscopy (STM) to examine porphycene molecules adsorbed on a copper surface. It shows that individual copper atoms can modify the reaction substantially. It confirms that placing two adatoms symmetrically around the porphycene has no effect on the overall reaction rate.

Published
2014
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198. Two-Dimensional Metal–Organic Framework on Superconducting NbSe2

Author

Yan, Linghao, Silveira, Orlando J., Alldritt, Benjamin, Kezilebieke, Shawulienu, Foster, Adam S., and Liljeroth, Peter

Abstract

The combination of two-dimensional (2D) materials into vertical heterostructures has emerged as a promising path to designer quantum materials with exotic properties. Here, we extend this concept from inorganic 2D materials to 2D metal–organic frameworks (MOFs) that offer additional flexibility in realizing designer heterostructures. We successfully fabricate a monolayer 2D Cu-dicyanoanthracene MOF on a 2D van der Waals NbSe2superconducting substrate. The structural and electronic properties of two different phases of the 2D MOF are characterized by low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS), complemented by density-functional theory (DFT) calculations. These experiments allow us to follow the formation of the kagome band structure from Star of David-shaped building blocks. This work extends the synthesis and electronic tunability of 2D MOFs beyond the electronically less relevant metal and semiconducting surfaces to superconducting substrates, which are needed for the development of emerging quantum materials such as topological superconductors.

Published
2021
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199. Order from a Mess: The Growth of 5-Armchair Graphene Nanoribbons

Author

Berdonces-Layunta, Alejandro, Schulz, Fabian, Aguilar-Galindo, Fernando, Lawrence, James, Mohammed, Mohammed S. G., Muntwiler, Matthias, Lobo-Checa, Jorge, Liljeroth, Peter, and de Oteyza, Dimas G.

Abstract

The advent of on-surface chemistry under vacuum has vastly increased our capabilities to synthesize carbon nanomaterials with atomic precision. Among the types of target structures that have been synthesized by these means, graphene nanoribbons (GNRs) have probably attracted the most attention. In this context, the vast majority of GNRs have been synthesized from the same chemical reaction: Ullmann coupling followed by cyclodehydrogenation. Here, we provide a detailed study of the growth process of five-atom-wide armchair GNRs starting from dibromoperylene. Combining scanning probe microscopy with temperature-dependent XPS measurements and theoretical calculations, we show that the GNR growth departs from the conventional reaction scenario. Instead, precursor molecules couple by means of a concerted mechanism whereby two covalent bonds are formed simultaneously, along with a concomitant dehydrogenation. Indeed, this alternative reaction path is responsible for the straight GNR growth in spite of the initial mixture of reactant isomers with irregular metal–organic intermediates that we find. The provided insight will not only help understanding the reaction mechanisms of other reactants but also serve as a guide for the design of other precursor molecules.

Published
2021
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