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Duncan Thomas Lindsay Alexander

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Related publications (76)

Imaging Nonradiative Point Defects Buried in Quantum Wells Using Cathodoluminescence

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Duncan Thomas Lindsay Alexander, Wei Liu, Wei Liu, Thomas Fjord Kjaersgaard Weatherley

Crystallographic point defects (PDs) can dramatically decrease the efficiency of optoelectronic semiconductor devices, many of which are based on quantum well (QW) heterostructures. However, spatially resolving individual nonradiative PDs buried in such QW ...

AMER CHEMICAL SOC2021

Waveguide modes spatially resolved by low-loss STEM-EELS

Duncan Thomas Lindsay Alexander

In an era of new developments in nanomaterials analysis enabled by the unprecedented spatial and energy resolutions of electron energy-loss spectroscopy in the scanning transmission electron microscope (STEM-EELS), it remains that the vast majority of work ...

2021

Near-Field Mapping of Photonic Eigenmodes in Patterned Silicon Nanocavities by Electron Energy-Loss Spectroscopy

Valentin Flauraud, Duncan Thomas Lindsay Alexander

Recently, there has been significant interest in using dielectric nanocavities for the controlled scattering of light, owing to the diverse electromagnetic modes that they support. For plasmonic systems, electron energy-loss spectroscopy (EELS) is now an e ...

2021

Crossover between distinct symmetries in solid solutions of rare earth nickelates

Jean-Marc Triscone, Duncan Thomas Lindsay Alexander, Bernat Mundet

A strong coupling of the lattice to functional properties is observed in many transition metal oxide systems, such as the ABO(3) perovskites. In the quest for tailor-made materials, it is essential to be able to control the structural properties of the com ...

2021

Near-Atomic-Scale Mapping of Electronic Phases in Rare Earth Nickelate Superlattices

Jean-Marc Triscone, Duncan Thomas Lindsay Alexander, Bernat Mundet

Nanoscale mapping of the distinct electronic phases characterizing the metal-insulator transition displayed by most of the rare-earth nickelate compounds is fundamental for discovering the true nature of this transition and the possible couplings that are ...

AMER CHEMICAL SOC2021

Double-atom catalysts as a molecular platform for heterogeneous oxygen evolution electrocatalysis

Duncan Thomas Lindsay Alexander, Xile Hu, Lichen Bai

The oxygen evolution reaction (OER) is an essential anode reaction for the generation of fuels through water splitting or CO2 electroreduction. Mixed metal oxides containing Co, Fe or Ni have proved to be the most promising OER electrocatalysts in alkaline ...

NATURE PORTFOLIO2021

3D Ordering at the Liquid-Solid Polar Interface of Nanowires

Cécile Hébert, Duncan Thomas Lindsay Alexander, Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Nicolas Tappy, Martin George Friedl, Michele Ceriotti, Luca Francaviglia, Giulio Imbalzano, Mahdi Zamani, Lea Ghisalberti, Sara Marti Sanchez

The nature of the liquid-solid interface determines the characteristics of a variety of physical phenomena, including catalysis, electrochemistry, lubrication, and crystal growth. Most of the established models for crystal growth are based on macroscopic t ...

Wiley2020

Triplet grain growth in a-texture polycrystalline ZnO thin films

Arthur Brian Aebersold, Cécile Hébert, Duncan Thomas Lindsay Alexander

A growth of grain triplets is identified in vapor deposited, a-texture polycrystalline zinc oxide thin films, using a combination of transmission electron microscopy-based automated crystal orientation mapping and high-resolution imaging. Each triplet cons ...

2020

Length scales of interfacial coupling between metal and insulator phases in oxides

Jean-Marc Triscone, Duncan Thomas Lindsay Alexander, Bernat Mundet

The characteristic length scale and mechanism of the metal-insulator transition in nickelate superlattices is addressed, with implications for the design of oxide electronics. ...

NATURE PUBLISHING GROUP2020

Quantifying competitive grain overgrowth in polycrystalline ZnO thin films

Christophe Ballif, Aïcha Hessler-Wyser, Sylvain Nicolay, Arthur Brian Aebersold, Cécile Hébert, Duncan Thomas Lindsay Alexander, Lorenzo Fanni

2019

Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys

Olivier Martin, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, nanoalloys of noble metals, such as gold, with transition elements, such as iron, have unique properties and a number of potential app ...

2019

A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction

Duncan Thomas Lindsay Alexander, Xile Hu, Lichen Bai

Single-atom catalysts exhibit well-defined active sites and potentially maximum atomic efficiency. However, they are unsuitable for reactions that benefit from bimetallic promotion such as the oxygen evolution reaction (OER) in an alkaline medium. Here we ...

2019

Efficient cleavage of aryl ether C–O linkages by Rh–Ni and Ru–Ni nanoscale catalysts operating in water

Paul Joseph Dyson, Vassily Hatzimanikatis, Duncan Thomas Lindsay Alexander, Ning Yan, Antoine Philippe Van Muyden, Safak Bulut, Georgios Savoglidis, Sviatlana Siankevich

Bimetallic Ru–Ni and Rh–Ni nanocatalysts coated with a phase transfer agent efficiently cleave aryl ether C–O linkages in water in the presence of hydrogen. For dimeric substrates with weaker C–O linkages, i.e. α-O-4 and β-O-4 bonds, low loadings of the pr ...

2018

Centimeter-Sized Single-Orientation Monolayer Hexagonal Boron Nitride With or Without Nanovoids

Aleksandra Radenovic, Duncan Thomas Lindsay Alexander, Ke Liu, Huanyao Cun

American Chemical Society (ACS)2018

Structural analysis of LaVO3 thin films under epitaxial strain

Duncan Thomas Lindsay Alexander

2018

Structural analysis of LaVO3 thin films under epitaxial strain (vol 6, 046102, 2018)

Duncan Thomas Lindsay Alexander

2018

Single-layer graphene membranes by crack-free transfer for gas mixture separation

Duncan Thomas Lindsay Alexander, Emad Oveisi, Andreas Züttel, Kumar Varoon Agrawal, Shiqi Huang, Guangwei He, Mostapha Dakhchoune, Wen Luo, Jing Zhao

The single-layer graphene film, when incorporated with molecular-sized pores, is predicted to be the ultimate membrane. However, the major bottlenecks have been the crack-free transfer of large-area graphene on a porous support, and the incorporation of mo ...

Nature Publishing Group2018

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Valerio Romano, Duncan Thomas Lindsay Alexander, Hossein Najafi, Ali El Sayed

Combining the sol-gel method for fiber material production with the granulated silica method for preform assembly results in a robust method that offers a high degree of freedom regarding both the composition and the geometry of the produced fiber. Using t ...

2018

Where Does Energy Go in Electron Energy Loss Spectroscopy of Nanostructures?

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

Electron energy loss spectroscopy is a method of choice for the characterization of both the spatial and spectral properties of localized surface plasmon resonances. The energy lost by the impinging electrons is commonly explained by the Lorentz force acti ...

2017

Direct Imaging of Dopant Distribution in Polycrystalline ZnO Films

Christophe Ballif, Aïcha Hessler-Wyser, Sylvain Nicolay, Arthur Brian Aebersold, Cécile Hébert, Duncan Thomas Lindsay Alexander, Stéphane Laurent Escrig, Monica Morales Masis, Martin Ledinsky

Two fundamental requirements of transparent conductive oxides are high conductivity and low optical absorptance, properties strongly dependent on the free-carrier concentration of the film. The free carrier concentration is usually-tuned by the addition of ...

Amer Chemical Soc2017

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