Construction of a network structure composed of gold nanoparticles and spin-polarized molecular wires and its conducting and magnetic properties

Minamoto, Masaru; Matsushita, Michio M.; Sugawara, Tadashi

doi:10.1016/j.poly.2005.03.083

Cited by 15 publications

(13 citation statements)

References 21 publications

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“…19 Interdigitated gold electrode with a gap of 2 m was prepared on an n-doped Si substrate covered with a 700 nm-thick SiO 2 layer. The interdigitated electrodes ͑IDE͒ consist of 250 pairs of 2-mm-long parallel teeth, corresponding to an electrode with a gap of 2 m and a total length of 1000 mm.…”

Section: Methodsmentioning

confidence: 99%

“…The T versus temperature plot of the SPM network indicates that paramagnetic spins of the wire molecules exhibit a small antiferromagnetic interaction with = 0.18 K. The Curie constant ͑C = 5.55 emu K mol −1 ͒ evaluated from the intercept suggests that about 15 spins are on a nanoparticle on average. 19 The SLM network contains a tiny amount of impurity spin; less than one spin per one gold nanoparticle containing ca. 1750 gold atoms.…”

Section: Methodsmentioning

confidence: 99%

“…Though not shown here, we have confirmed through TEM images that the gold nanoparticles in each granule are separated from one another by a gap of 1.6 nm, which corresponds to the length of wire molecules. 19 A series of more than 20 granules is necessary for bridging the 2 m-gap electrode. The inspection of the FE-SEM image suggests that an average number of granule-granule junctions, N j , is 30 in one bridge.…”

Section: A Formation Of the Network Structurementioning

confidence: 99%

“…1͑a͔͒ for constructing networked gold nanoparticles. 19 A localized spin ͑s =1/ 2͒ on the spin-polarized wire molecule is expected to serve as a spin-flip scatterer embedded in the tunnel junction. In both networks, formed by the spin-polarized and the spinless molecules ͓spinless wire molecule ͑SLM͒, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Cotunneling current affected by spin-polarized wire molecules in networked gold nanoparticles

et al. 2008

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As a bottom-up approach toward spintronics, a network structure of gold nanoparticles connected with spin-polarized wire molecules has been studied. A spinless network is prepared as a reference system. The network of gold nanoparticles with an average diameter of 4 nm form granules ͑average diameter of 100 nm͒, which in turn, connect themselves with each other to bridge 2 m-gap gold electrodes. Since the charging energy of a 4-nm gold nanoparticle amounts to 160 meV, it works as a Coulomb island and the conduction through the network is dominated by Coulomb blockade effect at room temperature. Thermal-activation-type conduction is found in a temperature range of 300 K-30 K, below which cotunneling is suggested to dominate. Important findings reported here are as follows: ͑1͒ The cotunneling occurs at elevated temperatures as high as T = 30 K due to the small size of gold nanoparticles: Nonlinear characteristics featured by I-V 3 are found, suggesting that the number of tunnel junctions relevant to the cotunneling is two. ͑2͒ The cotunneling current is substantially smaller in spin-polarized network than in spinless network, suggesting that spin-flip scattering caused by localized spins on wire molecules suppresses cotunneling process: The interpretation is supported by negative magnetoresistance observed in spin-polarized networks.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: A Formation Of the Network Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cotunneling current affected by spin-polarized wire molecules in networked gold nanoparticles

et al. 2008

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“…We synthesized a 2,4‐dithienylpyrrole‐based wire molecule ( 1 ) to connect the nanoparticles. An unpaired electron on the nitronyl nitroxide (NN) group is provided, following a procedure previously described elsewhere (Scheme ) 10. The wire molecule ( 1 ) has hetero‐disulfide groups at both terminals that form covalent bonds to Au atoms at the surface of the nanoparticles and electrodes 11.…”

Section: Methodsmentioning

confidence: 99%

Controlling Co‐tunneling Currents in Nanoparticle Networks Using Spin‐Polarized Wire Molecules

Nickels

Matsushita

Minamoto

et al. 2008

Small

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Application of the elongation method to the electronic structure of spin-polarized molecular wire under electric field

Orimoto

Korchowiec

et al. 2009

Theor Chem Acc

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Construction of a network structure composed of gold nanoparticles and spin-polarized molecular wires and its conducting and magnetic properties

Cited by 15 publications

References 21 publications

Cotunneling current affected by spin-polarized wire molecules in networked gold nanoparticles

Cotunneling current affected by spin-polarized wire molecules in networked gold nanoparticles

Controlling Co‐tunneling Currents in Nanoparticle Networks Using Spin‐Polarized Wire Molecules

Application of the elongation method to the electronic structure of spin-polarized molecular wire under electric field

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