Formation and characterization of carbon–metal nano-contacts

Torre, Alessandro La; Romdhane, Ferdaous Ben; Baaziz, Walid; Janowska, Izabela; Pham‐Huu, Cuong; Pourroy, G.; Banhart, Florian

doi:10.1016/j.carbon.2014.06.004

Cited by 22 publications

(26 citation statements)

References 29 publications

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“…8. Recently, La Torre et al 25 formed and characterized several carbon-metal nanocontacts, and found that the monoatomic chains discussed in this work give a current of the order B0.2 nA for the same voltage and Fe/graphitic contacts, i.e. 4-5 orders of magnitude smaller than the value we find theoretically.…”

Section: Discussioncontrasting

confidence: 58%

Electron transport in carbon wires in contact with Ag electrodes: a detailed first principles investigation

Bonardi

Achilli

Tantardini

et al. 2015

Phys. Chem. Chem. Phys.

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The structure and electronic properties of carbon atom chains Cn in contact with Ag electrodes are investigated in detail with first principles means. The ideal Ag(100) surface is used as a model for binding, and electron transport through the chains is studied as a function of their length, applied bias voltage, presence of capping atoms (Si, S) and adsorption site. It is found that the metal-molecule bond largely influences electronic coupling to the leads. Without capping atoms the quality of the electric contact improves when increasing the carbon atom coordination number to the metal (1, 2 and 4 for adsorption on a top, bridge and hollow position, respectively) and this finding translates almost unchanged in more realistic tip-like contacts which present one, two or four metal atoms at the contact. Current-voltage characteristics show Ohmic behaviour over a wide range of bias voltages and the resulting conductances change only weakly when increasing the wire length. The effect of a capping species is typically drastic, and either largely reduces (S) or largely increases (Si) the coupling of the wire to the electrodes. Comparison of our findings with recent experimental results highlights the limits of the adopted approach, which can be traced back to the known gap problem of density-functional-theory.

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Section: Discussioncontrasting

confidence: 58%

Electron transport in carbon wires in contact with Ag electrodes: a detailed first principles investigation

Bonardi

Achilli

Tantardini

et al. 2015

Phys. Chem. Chem. Phys.

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“…The experiments were carried out in a dedicated specimen stage in a transmission electron microscope. Graphitic aggregates were contacted by a metallic tip 17 and retracted while an electrical current flowed through the system. In such a way, chains of carbon atoms were unravelled from the graphitic material.…”

Section: Resultsmentioning

confidence: 99%

“…This can lead to an unravelling of carbon chains from graphene layers or nanotube-like structures 15 . The procedure of tip fabrication and the contact chemistry have been described in recent studies 17 . The experiment was carried out in the specimen stage of a transmission electron microscope (Jeol 2100 F with C s -corrected condenser, located at the Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) in Strasbourg).…”

Section: Methodsmentioning

confidence: 99%

Strain-induced metal–semiconductor transition observed in atomic carbon chains

et al. 2015

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Carbyne, the sp1-hybridized phase of carbon, is still a missing link in the family of carbon allotropes. While the bulk phases of carbyne remain elusive, the elementary constituents, that is, linear chains of carbon atoms, have already been observed using the electron microscope. Isolated atomic chains are highly interesting one-dimensional conductors that have stimulated considerable theoretical work. Experimental information, however, is still very limited. Here we show electrical measurements and first-principles transport calculations on monoatomic carbon chains. When the 1D system is under strain, the chains are semiconducting corresponding to the polyyne structure with alternating bond lengths. Conversely, when the chain is unstrained, the ohmic behaviour of metallic cumulene with uniform bond lengths is observed. This confirms the recent prediction of a metal–insulator transition that is induced by strain. The key role of the contacting leads explains the rectifying behaviour measured in monoatomic carbon chains in a nonsymmetric contact configuration.

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“…Yuzvinsky et al reported conductivities one order of magnitude lower than expected [ 32 ], but in this preliminary study the occurrence of the chains was just assumed. Later experiments, where the chains were clearly visible [ 23 , 43 ], showed still lower conductivities. Current–voltage curves are rather simple two-terminal measurements that give access to the electrical characteristics of carbon chains.…”

Section: Reviewmentioning

confidence: 99%

Chains of carbon atoms: A vision or a new nanomaterial?

Banhart¹

2015

Beilstein J. Nanotechnol.

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SummaryLinear strings of sp1-hybridized carbon atoms are considered as a possible phase of carbon since decades. Whereas the debate about the stability of the corresponding bulk phase carbyne continues until today, the existence of isolated chains of carbon atoms has meanwhile been corroborated experimentally. Since graphene, as the two-dimensional sp2-bonded allotrope of carbon, has become a vast field, the question about the importance of one-dimensional carbon became of renewed interest. The present article gives an overview of the work that has been carried out on chains of carbon atoms in the past one or two decades. The review concentrates on isolated chains of carbon atoms and summarizes the experimental observations to date. While the experimental information is still very limited, many calculations of the physical and chemical properties have been published in the past years. Some of the most important theoretical studies and their importance in the present experimental situation are reviewed.

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Formation and characterization of carbon–metal nano-contacts

Cited by 22 publications

References 29 publications

Electron transport in carbon wires in contact with Ag electrodes: a detailed first principles investigation

Electron transport in carbon wires in contact with Ag electrodes: a detailed first principles investigation

Strain-induced metal–semiconductor transition observed in atomic carbon chains

Chains of carbon atoms: A vision or a new nanomaterial?

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