scholarly journals Biphenylene Sheet: A Nonbenzenoid Carbon Allotrope

2020 ◽  
Author(s):  
Qitang Fan ◽  
Linghao Yan ◽  
Matthias W Tripp ◽  
Ondrej Krejci ◽  
Stavrina Dimosthenous ◽  
...  
Keyword(s):  
Transport Properties ◽  
Hydrogen Fluoride ◽  
Scanning Probe ◽  
Bottom Up ◽  
Carbon Allotrope ◽  
Carbon Allotropes

The quest for planar sp2-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene sheet, has stimulated substantial research efforts because of the materials' predicted unique mechanical, electronic and transport properties. However, their synthesis remains challenging due to the lack of reliable protocols for generating non-hexagonal rings during the in-plane tiling of carbon atoms. Here, we report the bottom-up growth of ultra-flat biphenylene sheet with periodically arranged four-, six-, and eight-membered rings of sp2 carbon atoms, via an unprecedented on-surface inter-polymer hydrogen fluoride (HF)-zipping reaction. The characterization of this biphenylene sheet by scanning probe methods solves the long-standing controversy over its dielectric or metallic nature. We expect the inter-polymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.

scholarly journals Biphenylene Sheet: A Nonbenzenoid Carbon Allotrope

2020 ◽  
Author(s):  
Qitang Fan ◽  
Linghao Yan ◽  
Matthias W Tripp ◽  
Ondrej Krejci ◽  
Stavrina Dimosthenous ◽  
...  
Keyword(s):  
Transport Properties ◽  
Hydrogen Fluoride ◽  
Scanning Probe ◽  
Bottom Up ◽  
Carbon Allotrope ◽  
Carbon Allotropes

The quest for planar sp2-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene sheet, has stimulated substantial research efforts because of the materials' predicted unique mechanical, electronic and transport properties. However, their synthesis remains challenging due to the lack of reliable protocols for generating non-hexagonal rings during the in-plane tiling of carbon atoms. Here, we report the bottom-up growth of ultra-flat biphenylene sheet with periodically arranged four-, six-, and eight-membered rings of sp2 carbon atoms, via an unprecedented on-surface inter-polymer hydrogen fluoride (HF)-zipping reaction. The characterization of this biphenylene sheet by scanning probe methods solves the long-standing controversy over its dielectric or metallic nature. We expect the inter-polymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.

scholarly journals Biphenylene network: A nonbenzenoid carbon allotrope

Science ◽  
2021 ◽  
Vol 372 (6544) ◽  
pp. 852-856
Author(s):  
Qitang Fan ◽  
Linghao Yan ◽  
Matthias W. Tripp ◽  
Ondřej Krejčí ◽  
Stavrina Dimosthenous ◽  
...  
Keyword(s):  
Transport Properties ◽  
Scanning Probe ◽  
Bottom Up ◽  
Carbon Allotrope ◽  
Carbon Allotropes

The quest for planar sp2-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene networks, has stimulated substantial research efforts because of the materials’ predicted mechanical, electronic, and transport properties. However, their syntheses remain challenging given the lack of reliable protocols for generating nonhexagonal rings during the in-plane tiling of carbon atoms. We report the bottom-up growth of an ultraflat biphenylene network with periodically arranged four-, six-, and eight-membered rings of sp2-hybridized carbon atoms through an on-surface interpolymer dehydrofluorination (HF-zipping) reaction. The characterization of this biphenylene network by scanning probe methods reveals that it is metallic rather than a dielectric. We expect the interpolymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.

scholarly journals Spectroscopic Evidence of New Low-Dimensional Planar Carbon Allotropes Based on Biphenylene via On-Surface Ullmann Coupling

Chemistry ◽  
2021 ◽  
Vol 3 (3) ◽  
pp. 1057-1062
Author(s):  
Teng Zhang ◽  
Cesare Grazioli ◽  
Huixia Yang ◽  
Kaiyue Jiang ◽  
Iulia Emilia Brumboiu ◽  
...  
Keyword(s):  
Bottom Up ◽  
Carbon Allotrope ◽  
Spectroscopic Evidence ◽  
Carbon Allotropes ◽  
Carbon Networks ◽  
The Many ◽  
Low Dimensional ◽  
Planar Carbon ◽  
Ullmann Coupling

The bottom-up synthesis and preliminary characterizations of a new biphenylene-based 2D framework are presented. This new low-dimensional carbon allotrope potentially completes the many hypothesized carbon networks based on biphenylene.

scholarly journals An sp-hybridized molecular carbon allotrope, cyclo[18]carbon

Science ◽  
2019 ◽  
Vol 365 (6459) ◽  
pp. 1299-1301 ◽  
Author(s):  
Katharina Kaiser ◽  
Lorel M. Scriven ◽  
Fabian Schulz ◽  
Przemyslaw Gawel ◽  
Leo Gross ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Atomic Force Microscopy ◽  
High Reactivity ◽  
Carbon Allotrope ◽  
Force Microscopy ◽  
Carbon Allotropes ◽  
Atomic Force ◽  
Atom Manipulation ◽  
Single Bonds

Carbon allotropes built from rings of two-coordinate atoms, known as cyclo[n]carbons, have fascinated chemists for many years, but until now they could not be isolated or structurally characterized because of their high reactivity. We generated cyclo[18]carbon (C18) using atom manipulation on bilayer NaCl on Cu(111) at 5 kelvin by eliminating carbon monoxide from a cyclocarbon oxide molecule, C24O6. Characterization of cyclo[18]carbon by high-resolution atomic force microscopy revealed a polyynic structure with defined positions of alternating triple and single bonds. The high reactivity of cyclocarbon and cyclocarbon oxides allows covalent coupling between molecules to be induced by atom manipulation, opening an avenue for the synthesis of other carbon allotropes and carbon-rich materials from the coalescence of cyclocarbon molecules.

scholarly journals Effect of chemical modification on electronic transport properties of carbyne

2021 ◽  
Author(s):  
G. R. Berdiyorov ◽  
U. Khalilov ◽  
H. Hamoudi ◽  
Erik C. Neyts
Keyword(s):  
Transport Properties ◽  
Electronic Transport ◽  
Density Functional ◽  
Structural Changes ◽  
Carbon Chain ◽  
Functional Formalism ◽  
Functional Theory ◽  
Carbon Allotrope ◽  
Electronic Transport Properties ◽  
Interface Structures

AbstractUsing density functional theory in combination with the Green’s functional formalism, we study the effect of surface functionalization on the electronic transport properties of 1D carbon allotrope—carbyne. We found that both hydrogenation and fluorination result in structural changes and semiconducting to metallic transition. Consequently, the current in the functionalization systems increases significantly due to strong delocalization of electronic states along the carbon chain. We also study the electronic transport in partially hydrogenated carbyne and interface structures consisting of pristine and functionalized carbyne. In the latter case, current rectification is obtained in the system with rectification ratio up to 50%. These findings can be useful for developing carbyne-based structures with tunable electronic transport properties.

Measurement of Plasticity Gradients with Scanning Probe Microscopy

1993 ◽  
Vol 318 ◽  
Author(s):  
James D. Kiely ◽  
Dawn A. Bonnell
Keyword(s):  
Fracture Surface ◽  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Ceramic System ◽  
Force Microscopy ◽  
Metal Fracture ◽  
Atomic Force ◽  
Metal Ceramic

ABSTRACTScanning Tunneling and Atomic Force Microscopy were used to characterize the topography of fractured Au /sapphire interfaces. Variance analysis which quantifies surface morphology was developed and applied to the characterization of the metal fracture surface of the metal/ceramic system. Fracture surface features related to plasticity were quantified and correlated to the fracture energy and energy release rate.

scholarly journals Parallel- and serial-contact electrochemical metallization of monolayer nanopatterns: A versatile synthetic tool en route to bottom-up assembly of electric nanocircuits

2012 ◽  
Vol 3 ◽  
pp. 134-143 ◽  
Author(s):  
Jonathan Berson ◽  
Assaf Zeira ◽  
Rivka Maoz ◽  
Jacob Sagiv
Keyword(s):  
Metal Film ◽  
Scanning Probe ◽  
Bottom Up ◽  
Ion Migration ◽  
Surface Sites ◽  
Solution Interface ◽  
Hydrated Ions ◽  
Serial Process ◽  
Site Selective ◽  
Metal Delivery

Contact electrochemical transfer of silver from a metal-film stamp (parallel process) or a metal-coated scanning probe (serial process) is demonstrated to allow site-selective metallization of monolayer template patterns of any desired shape and size created by constructive nanolithography. The precise nanoscale control of metal delivery to predefined surface sites, achieved as a result of the selective affinity of the monolayer template for electrochemically generated metal ions, provides a versatile synthetic tool en route to the bottom-up assembly of electric nanocircuits. These findings offer direct experimental support to the view that, in electrochemical metal deposition, charge is carried across the electrode–solution interface by ion migration to the electrode rather than by electron transfer to hydrated ions in solution.

scholarly journals The memory effect of nanoscale memristors investigated by conducting scanning probe microscopy methods

2012 ◽  
Vol 3 ◽  
pp. 722-730 ◽  
Author(s):  
César Moreno ◽  
Carmen Munuera ◽  
Xavier Obradors ◽  
Carmen Ocal
Keyword(s):  
Memory Effect ◽  
Scanning Probe Microscopy ◽  
Electrical Characterization ◽  
Scanning Force Microscopy ◽  
Scanning Probe ◽  
Force Microscopy ◽  
Versatile Tool ◽  
Scanning Force ◽  
Memristor Device

We report on the use of scanning force microscopy as a versatile tool for the electrical characterization of nanoscale memristors fabricated on ultrathin La0.7Sr0.3MnO3 (LSMO) films. Combining conventional conductive imaging and nanoscale lithography, reversible switching between low-resistive (ON) and high-resistive (OFF) states was locally achieved by applying voltages within the range of a few volts. Retention times of several months were tested for both ON and OFF states. Spectroscopy modes were used to investigate the I–V characteristics of the different resistive states. This permitted the correlation of device rectification (reset) with the voltage employed to induce each particular state. Analytical simulations by using a nonlinear dopant drift within a memristor device explain the experimental I–V bipolar cycles.

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