Magnetic Properties of Chiral Gold Nanotubes
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RETICAL INORGANIC CHEMISTRY
Magnetic Properties of Chiral Gold Nanotubes P. N. D’yachkova, * and E. P. D’yachkova aKurnakov
Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] Received January 27, 2020; revised February 27, 2020; accepted February 29, 2020
Abstract—Magnetic fields generated by nanosolenoids based on gold nanotubes have been calculated. The electron energy levels in nanotubes have been calculated by the linearized augmented cylindrical wave method with cyclic Born–Von Kármán boundary conditions and with taking into account helical symmetry of the tubes. The numbers of conducting channels, low-temperature ballistic electron currents, and magnetic fields in nanosolenoids based on gold nanotubes of various length and structure have been determined. The data obtained demonstrate that chiral gold nanotubes are promising materials for creation of nanosolenoids with strong magnetic fields and can be used for more realistic design of nanosolenoids. Keywords: chirality, magnetic properties, nanosolenoids, modeling DOI: 10.1134/S0036023620070074
The development of nanotechnology leads to the miniaturization of electronic devices and their components, which initiates, in particular, interest in designing nanoscale electromagnets and inductors in which helicoidal electron flows through a nanowire will generate a magnetic field. It has been suggested that chiral nanotubes can serve as nanosolenoids [1– 8]. The best-known ideal (n1, n2) carbon nanotubes are not suitable for this, since solenoids require materials with metal conductivity, whereas carbon nanotubes are either dielectrics or quasi-metals depending on their structure (on n1 and n2) [9–11]. Chemically modified heteronanotubes composed of bonded spiral ribbons of carbon and boron nitride [1], as well as some carbon nanotubes twisted in the form of spirals with a very complex (possibly unrealistic) geometry [6, 7], turned out to be more suitable. It is expected that relatively strong magnetic fields can be obtained on composites of carbon nanotubes and copper [8].
review, information appeared on their use for solving the problems of enantioseparation, and protein biosensing, immunosensing, DNA detection, and photothermal cell ablation [18]. This study is aimed at calculating the magnetic fields generated by chiral gold nanotubes during the passage of electric current. We assume that electric current in gold chiral nanotubes flows only in the direction of helical translations. This assumption is consistent with previous studies of chiral current induction, magnetodynamics, chiral conductivity, and self-induction in carbon nanotubes and in helical molecular systems [29–34]. It is also worth noting that for chiral (5, 3) and (6, 3) Fe tubes, an explicit form of the electron density distribution (squared wave eigenfunctions) for conducting states at the Fermi level reported in [35] clearly illustrates the presence of helical chiral current transporting channels in nanotubes.
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