Featured
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In situ imaging of amorphous intermediates during brucite carbonation in supercritical CO2
Non-classical crystallization may proceed through formation of intermediate phases, but it is not known whether these are linked to the final crystallization. Here, using an atomic force microscope at 90 bar, brucite carbonation is directly observed, with an amorphous intermediate acting as the seed for crystalline nesquehonite.
- Xin Zhang
- , Alan S. Lea
- & Kevin M. Rosso
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Site-specific chemical doping reveals electron atmospheres at the surfaces of organic semiconductor crystals
Organic semiconductor crystals can be selectively doped at the crystallographic step edges, deactivating shallow traps and recovering band-like transport. The space charge induced by chemical doping is observed by scanning Kelvin probe microscopy.
- Tao He
- , Matthias Stolte
- & C. Daniel Frisbie
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Tuning surface d bands with bimetallic electrodes to facilitate electron transport across molecular junctions
Coating Au electrodes with Ag or Cu monolayers is shown to improve molecule–electrode binding and electrical conductivity of single-molecule junctions as a result of the tuning of the surface d bands of the metal.
- Mong-Wen Gu
- , Hao Howard Peng
- & Chun-hsien Chen
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Mechanical dissipation via image potential states on a topological insulator surface
Non-contact dissipation measurements reveal an interplay between electronic states and nanomechanics in Bi2Te3, a canonical topological insulator with protected metallic surface states.
- D. Yildiz
- , M. Kisiel
- & E. Meyer
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Letter |
Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
High-resolution spectroscopy supports the presence of Majorana bound states in an iron-based topological superconductor.
- T. Machida
- , Y. Sun
- & T. Tamegai
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News & Views |
When defects are not defects
Line defects in two-dimensional borophene can self-assemble into new crystalline phases, blurring the distinctions between perfect and defective crystal.
- Arkady V. Krasheninnikov
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News & Views |
Modelling polycystic kidney disease
Cysts were generated from organoids in vitro and the removal of adherent cues was shown to play a key role in polycystic kidney disease progression. These cysts resembled those of diseased tissue phenotypically and were capable of remodelling their microenvironment.
- Paola Romagnani
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News & Views |
Roughness in flatland
Energy-favoured grain rotation in nanocrystalline metals is shown to cause surface roughness at the atomic scale, providing fundamental insight for grain boundary engineering in materials design.
- Jakob Schiøtz
- & Karsten W. Jacobsen
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Structure of a model TiO2 photocatalytic interface
The interaction of water with TiO2 is crucial for applications such as photocatalytic water splitting. The interfacial structure between water and rutile TiO2 is now shown to consist of an array of hydroxyl molecules with water in the second layer.
- H. Hussain
- , G. Tocci
- & G. Thornton
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Adsorption of water at the SrO surface of ruthenates
The interaction between perovskite oxides and water can have a significant influence on practical performance. Here the authors study the dynamics of surface water adsorption and hydroxide formation during monolayer formation on a ruthenate.
- Daniel Halwidl
- , Bernhard Stöger
- & Ulrike Diebold
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News & Views |
Single-molecule contacts exposed
Using a scanning tunnelling microscopy-based method it is now possible to get an atomistic-level description of the most probable binding and contact configuration for single-molecule electrical junctions.
- Richard J. Nichols
- & Simon J. Higgins
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Real-space imaging of interfacial water with submolecular resolution
Resolving the internal structure of water molecules adsorbed on solid surfaces is challenging. Submolecular-resolution imaging of individual water monomers and tetramers on NaCl(001) films supported by a Au(111) substrate is now reported. The molecular orbitals of adsorbed water were directly visualized, which lead to the discrimination between the orientation of the monomers and the tetramers H-bond directionality.
- Jing Guo
- , Xiangzhi Meng
- & Ying Jiang
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Letter |
Scanning tunnelling microscopy imaging of symmetry-breaking structural distortion in the bismuth-based cuprate superconductors
The so-called pseudogap is a feature of high-Tc superconductors that has puzzled scientists since its discovery. It is of widespread opinion that this feature is associated with a structural symmetry breaking. Now, a highly sensitive scanning tunnelling microscopy experiment shows that a specific structural symmetry is not, as many believed, at the origin of the pseudogap state.
- Ilija Zeljkovic
- , Elizabeth J. Main
- & Jennifer E. Hoffman
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H-atom relay reactions in real space
The relay mechanism in which hydrogen atom transfer occurs along hydrogen bonds plays a crucial role in many functional compounds. Using a scanning tunnelling microscope, the transfer of hydrogen atoms along hydrogen-bonded chains assembled on a Cu(110) surface is shown to be controllable and reversible.
- T. Kumagai
- , A. Shiotari
- & H. Ueba
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Letter |
Scanning tunnelling microscopy and spectroscopy of ultra-flat graphene on hexagonal boron nitride
Using boron nitride as a substrate for graphene has been suggested as a promising way to reduce the disorder in graphene caused by space fluctuations. It is now shown by scanning tunnelling microscopy that graphene conforms perfectly to boron nitride and the charge fluctuations are minimal compared with the conventionally used substrate, silica. Boron nitride could really be the natural graphene substrate.
- Jiamin Xue
- , Javier Sanchez-Yamagishi
- & Brian J. LeRoy
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Letter |
Many-body effects in electronic bandgaps of carbon nanotubes measured by scanning tunnelling spectroscopy
Why does the bandgap in semiconducting carbon nanotubes depend on the way it is measured? It is now shown that the results obtained by scanning tunnelling spectroscopy are usually influenced by screening, which creates the discrepancy with optical measurements. The results highlight the importance of many-body effects in the electronic properties of carbon nanotubes.
- H. Lin
- , J. Lagoute
- & S. Rousset