Prospects and Problems of Single Molecule Information Devices

Wada, Yasuo; Tsukada, Masaru; Fujihira, Masamichi; Matsushige, Kazumi; Ogawa, Takuji; Haga, Masa‐aki; Tanaka, Shoji

doi:10.1143/jjap.39.3835

Cited by 95 publications

(39 citation statements)

References 89 publications

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“…The nano-meter-level device is one in which a single molecule or molecular assembly is embedded as a key part [1,2]. We are currently researching a bottom-up technique that involves control of a molecular array by changing the structure of its functional molecule.…”

Section: Introductionmentioning

confidence: 99%

STM investigation of porphyrin isomers on metal substrates

Terui¹,

Kamikado²,

Okuno³

et al. 2004

Current Applied Physics

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Section: Introductionmentioning

confidence: 99%

STM investigation of porphyrin isomers on metal substrates

Terui¹,

Kamikado²,

Okuno³

et al. 2004

Current Applied Physics

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“…1 Development of scanning tunneling microscopy (STM) 2 has realized imaging and manipulation of individual atoms and small molecules. [3][4][5] Molecule-based materials can ultimately be designed by assembling single molecules, the closed quantum system of which basically defines optoelectronic functions in their solid states.…”

mentioning

confidence: 99%

Molecularly Resolved Dynamics for Two-Dimensional Nucleation of Supramolecular Assembly

et al. 2002

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Nucleation growth of a platinum porphyrin derivative adsorbed on a Cu (100) surface was observed with a scanning tunneling microscope. The molecule attached with four di-tert-butylphenyl groups allowed equilibrium between diffusional gas phase and two-dimensional nuclei. To minimize the free energy for nucleation, the registry of the molecules into the kink sites resulted in formation of nuclei with singular, rectangular contours. Dependence of the equilibrium conditions on the sample-tip bias voltages was also presented.Being faced with the limitation of top-down technology with semiconductors soon, a new paradigm based on molecular assembling with finite nanometer dimensions has attracted attention for high-density and high-speed devices. 1 Development of scanning tunneling microscopy (STM) 2 has realized imaging and manipulation of individual atoms and small molecules. 3-5 Molecule-based materials can ultimately be designed by assembling single molecules, the closed quantum system of which basically defines optoelectronic functions in their solid states. Structures as well as electronic properties of molecular aggregates are strongly dependent on intermolecular interactions with weak van der Waals (VDW) forces. Substrate-molecule interactions are also crucial parameters in case of constructing molecular devices in thin films. Molecular design and synthesis enable control of those interactions by modification of molecular frameworks and substitution of peripheral groups. For example, a metalloporphyrin derivative, Cu-tetra-(3,5-di-tert-butylphenyl)-porphyrin (Cu-TBPP), was the first supramolecule which attained room-temperature manipulation 6 and conformational identification 7 by STM. The four di-tert-butylphenyl (tBP) groups maintained moderate interactions with a Cu (100) surface to prevent unfavorable diffusional motion of adsorbed molecules. This molecule was further provided to demonstrate conductance switching caused by rotation of the tBP group under low-temperature STM manipulation. 8 Recently, substitution of these peripheral groups of metal-free (H 2 -) TBPP with cyanophenyl terminations dramatically modified intermolecular interactions between adjacent adsorbates on a Au (111) surface, resulting in controlled assembling from monomers to tetramers or one-dimensional (1D) wires. 9 At higher coverage of unsubstituted H 2 -TBPP on the surface, nonplanar adsorption and orientational ordering occurred in its two-dimensional (2D) islands. 10 Those reported findings suggest potential versatility of this class of supramolecules for bottom-up assembling from single molecules to higher dimensional aggregates by molecular modifications.In this study, we have synthesized TBPP substituted with a heavy central metal of platinum (Pt-TBPP, Figure 1a) according to the literature 11 and investigated dynamic processes of its 2D nucleation growth on a Cu (100) surface by low-temperature STM. The molecular structure of Pt-TBPP optimized by the ab initio molecular orbital calculation based on the density functional theory...

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“…Thus, the electrical conductance for the attached cyclic QW is obtained using the GF approach and TM method. From equation (12) in the operator form and the cyclic QW Hamiltonian that cited in equation (23), the TM for odd and even sites of the benzene-chain is written as the following form…”

Section: Exact Results On G 1n and Conductance For A Quasi-1d Qwmentioning

confidence: 99%

“…The most important reasons for this are development of the nanofabrication techniques, in materials science [8][9][10][11], and the possibility of its application to sensors, displays, smart materials, molecular motors, logic and memory devices and molecular scale transistor devices. One of the major issues of nano-electronics is a relation between the molecular structure and the conductance of a molecular device [12]. Much effort has been made to develop different methods to calculate the electrical conductance of molecular structures such as carbon chains [13] and benzene chains [14,15].…”

Section: Introductionmentioning

confidence: 99%

Electrical conductance in a typical linear and cyclic quantum wire

Mardaani

Shokri

2009

IJNT

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Theoretical studies on electrical conductance in nanostructures which consist of two semi-infinite leads separated by a typical molecular wire are carried out within Green's function (GF) formalism in the linear regime. For this reason, the GF of extended molecular wire is obtained. Hence, the electrical conductance of the system is derived theoretically, using the GF elements and wire self-energies, within the tight-binding approach and in the ballistic regime. Based on this formalism, the electrical conductance of a linear molecular wire such as poly-acetylene is calculated. The results show that for this chain, a gap appears in the band structure. Moreover, the formalism is generalised to the quasi one dimensional chain such as cyclic benzene wires attached to the metallic leads in the cis and trans classes. Our results show that in the trans class, the conductance of benzene chain decreases as increases the length of the chain.

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Prospects and Problems of Single Molecule Information Devices

Cited by 95 publications

References 89 publications

STM investigation of porphyrin isomers on metal substrates

STM investigation of porphyrin isomers on metal substrates

Molecularly Resolved Dynamics for Two-Dimensional Nucleation of Supramolecular Assembly

Electrical conductance in a typical linear and cyclic quantum wire

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