One-dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single-Wall Carbon Nanotubes

The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic and chemical properties. Yet, the structural diversity of these main group elements is still poorly explored. Here we fill single‐wall carbon nanotubes with elemental arsenic from the vapor phase. Using electron microscopy, we find chains of highly reactive As4 molecules as well as two new one‐dimensional allotropes of arsenic: a single‐stranded zig‐zag chain and a double‐stranded zig‐zag ladder. These linear structures are important intermediates between the gas‐phase clusters of arsenic and the extended sheets of arsenene. Raman spectroscopy indicates weak electronic interaction between the arsenic and the nanotubes which implies that the formation of the new allotropes is driven primarily by the geometry of the confinement. The relative stabilities of the new arsenic structures are estimated computationally. Band‐gap calculations predict that the insulating As4 chains become semiconducting, once converted to the zig‐zag ladder, and form a fully metallic allotrope of arsenic as the zig‐zag chain.

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DOI: 10.1002/anie.201805856

News

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The ICE group survived Hever!

Yesterday morning’s adverse weather conditions (to put it mildly) made the triathlon even more challenging. The swimmers had to cope with very cold water, the hilly bike track was dangerously slippery and the running track was mostly covered in mud. Undeterred, both teams completed the triathlon – soaking wet (even the ones that didn’t swim!) […]

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Single-atom alloy Perspective made it onto the JPCL cover!

The next issue of The Journal of Physical Chemistry Letters will feature cover art from the perspective article ‘Lonely Atoms with Special Gifts: Breaking Linear Scaling Relationships in Heterogeneous Catalysis with Single-Atom Alloys’ by Matthew T. Darby, Michail Stamatakis, Angelos Michaelides, and E. Charles H. Sykes. The cover depicts the atomic structure of a so-called […]

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The ICE group is Triathlon-ing for WaterAid again!

After last year’s phenomenal victory, the ICE group is participating for the second time in the Hever Castle Triathlon. This year, there will be two relay teams: Phil, Gabriele, and Angelos will compete again in the half-ironman, while Andrea, his wife Sara, and Patrick will compete over the Olympic distance. The ICE group is not only trying […]

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Open Postdoc position

A position for a Research Associate in Computational Catalysis is now open. The project about methane activation at single atom alloys involves collaboration with Dr Michail Stamatakis and Prof. Charlie Sykes. To find out more or to apply, click here.

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Welcome Sam and Piero!

The ICE group is happy to welcome Sam Azadi and Piero Gasparotto, who joined us last month. The weather appeared eager to welcome them warmly as well, and we hope their time here will be as enjoyable and successful as the first month promised it to be.

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Michael wins prize for his Final Year MSci presentation!

Michael won a prize for the Best Final Year MSci presentation in the Condensed Matter and Materials Physics (CMMP) group for his project on ice nucleation titled “Achieving Cubic Ice”. Congratulations!

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2 PhD positions available

Two PhD positions are available in the ICE group. The projects are aimed at applying and developing computer simulation approaches to better understand the formation of ice.

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Open Postdoc position in a joint BP – UCL project

A postdoc position is currently open as part of the Knowledge Transfer Partnership between BP and UCL. The 3 year post will be predominantly based at BP offices in Sunbury-on-Thames and involve collaboration with the ICE group and Alberto Striolo’s group in the Chemical Engineering department. Click here to find out more about the post […]

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Martin and Patrick Won Prizes at the TYC Student Day 2018

The ICE group won prizes at this year’s Thomas Young Centre student day! With his presentation entitled “Role of Structure and Dynamics in Heterogeneous Ice Nucleation: A Tale of Two Brothers?” Martin won the prize for the best talk given amongst 12 shortlisted final-year PhD students in the TYC. For his contribution “A Machine Learning […]

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Patrick’s paper has been published in PRB

Patrick’s paper has been published in Physical Review B. In collaboration with Gábor Csányi at the University of Cambridge, Patrick developed a Gaussian approximation potential to simulate graphene to the same accuracy as density functional theory but at a computational cost smaller by magnitudes. The paper is available on the PRB website and our own.

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Group gatherings