Carbon-atom wires produced by nanosecond pulsed laser deposition in a background gas

Casari, Carlo Spartaco; Giannuzzi, Cosimo Salvatore; Russo, Valeria

doi:10.1016/j.carbon.2016.03.056

Cited by 37 publications

(23 citation statements)

References 54 publications

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“…The chemical synthesis of polyynes involves several different approaches [9,19], ranging from the step synthesis involving oxidative coupling and the use of alkylsilane as protective end groups [28], to the laser ablation of carbon targets [29,30] as well as the submerged carbon arc [9][10][11][12] in which all polyynes are formed simultaneously in a single shot. It is indeed amazing that carbon arc and laser ablation conditions are mimicking the circumstellar environment [31][32][33][34] in which polyynes and cyanopolyynes are detected by radioastronomy and other techniques [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis and characterization of polyynes end-capped by biphenyl groups (α,ω-biphenylpolyynes)

Cataldo¹,

Ursini

Milani

et al. 2018

Carbon

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Stable polyyne chains terminated with biphenyl end groups (α,ω-biphenylpolyynes) were synthesized in a single step with an easy procedure by using the Cadiot-Chodkiewicz reaction conditions. The α,ω-biphenylpolyynes were separated through HPLC analysis and identified by means of their electronic absorption spectra. The α,ω-biphenylpolyynes were studied by FT-IR and Raman spectroscopy and the spectral interpretation was supported with DFT calculations. A peculiar stability of α,ω-biphenylpolyynes towards ozone was also observed.

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Section: Introductionmentioning

confidence: 99%

One-pot synthesis and characterization of polyynes end-capped by biphenyl groups (α,ω-biphenylpolyynes)

Cataldo¹,

Ursini

Milani

et al. 2018

Carbon

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“…While many different techniques succeeded in producing sp-carbon systems, their identification in complex carbon materials with different hybridization states is non-trivial. Raman spectroscopy has emerged as one of the techniques of choice for unambiguous identification and investigation of sp-carbon [3,14,40] . Indeed, as for carbon-based nanomaterials including nanotubes and graphene, Raman provides peculiar structural information, such as the tube diameter and the number of layers in graphene.…”

Section: Carbon Atom Wires As Finite Carbyne-like Systemsmentioning

confidence: 99%

Carbyne: from the elusive allotrope to stable carbon atom wires

Casari¹,

Milani²

2018

MRS Communications

120

103

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Besides graphite and diamond, the solid allotropes of carbon in sp 2 and sp 3 hybridization, the possible existence of a third allotrope based on the sp-carbon linear chain, the Carbyne, has stimulated researchers for a long time. The advent of fullerenes, nanotubes and graphene has opened new opportunities and nurtured the interest in novel carbon allotropes including linear structures. The efforts made in this direction produced a number of interesting sp-hybridized carbon molecules and nanostructures in the form of carbon-atom wires. We here discuss some of the new perspectives opened by the recent advancements in the research on sp-carbon systems.

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“…The main strategies can be divided into physical-based and chemical-based. Physical methods are usually based on the clustering from a carbon vapour or plasma in out-of-equilibrium conditions and span from laser ablation to arch discharge, both in gases and in liquids [22,23,24,25]. Chemical-based techniques exploit rational synthesis methods such as polycondensation reactions, dehydrogenation of polymers and dehalogenation reactions to achieve fine control on wire length and termination [26,27,28,29].…”

Section: Introductionmentioning

confidence: 99%

Fingerprints of sp1 Hybridized C in the Near-Edge X-ray Absorption Spectra of Surface-Grown Materials

et al. 2018

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Carbon structures comprising sp1 chains (e.g., polyynes or cumulenes) can be synthesized by exploiting on-surface chemistry and molecular self-assembly of organic precursors, opening to the use of the full experimental and theoretical surface-science toolbox for their characterization. In particular, polarized near-edge X-ray absorption fine structure (NEXAFS) can be used to determine molecular adsorption angles and is here also suggested as a probe to discriminate sp1/sp2 character in the structures. We present an ab initio study of the polarized NEXAFS spectrum of model and real sp1/sp2 materials. Calculations are performed within density functional theory with plane waves and pseudopotentials, and spectra are computed by core-excited C potentials. We evaluate the dichroism in the spectrum for ideal carbynes and highlight the main differences relative to typical sp2 systems. We then consider a mixed polymer alternating sp1 C4 units with sp2 biphenyl groups, recently synthesized on Au(111), as well as other linear structures and two-dimensional networks, pointing out a spectral line shape specifically due to the the presence of linear C chains. Our study suggests that the measurements of polarized NEXAFS spectra could be used to distinctly fingerprint the presence of sp1 hybridization in surface-grown C structures.

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Carbon-atom wires produced by nanosecond pulsed laser deposition in a background gas

Cited by 37 publications

References 54 publications

One-pot synthesis and characterization of polyynes end-capped by biphenyl groups (α,ω-biphenylpolyynes)

One-pot synthesis and characterization of polyynes end-capped by biphenyl groups (α,ω-biphenylpolyynes)

Carbyne: from the elusive allotrope to stable carbon atom wires

Fingerprints of sp1 Hybridized C in the Near-Edge X-ray Absorption Spectra of Surface-Grown Materials

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