Electron transport in a gold nanoparticle assembly structure stabilized by a physisorbed porphyrin derivative

Yuki Noda, Shin Ichiro Noro, Tomoyuki Akutagawa, Takayoshi Nakamura

研究成果: Article

21 引用 (Scopus)

抜粋

Gold nanoparticles stabilized by meso-5,10,15,20-tetrakis(2-thienyl) porphyrin (2T) via physisorption (2T-AuNP) were synthesized, and the electronic transport of assemblies of these films was studied. The adsorption mechanism of 2T on gold nanoparticles was examined using UV-vis-NIR, IR, Raman, and H1 -NMR spectroscopy, which showed no evidence of any covalent bonding between 2T and the gold nanoparticles. In temperature-dependent resistivity measurements, a crossover from thermally assisted hopping to Efros-Shklovskii-type variable-range hopping (ES-VRH) was observed around 50 K on decreasing the temperature. At higher temperatures, the 2T-AuNP assembly structure followed an Arrhenius plot (EA =15 meV) with ohmic I-V characteristics at each measurement point. On the other hand, the activation energy at lower temperatures decreased nonlinearly in a T-1 plot, and the logarithm of the resistance obeyed a T-1/2 law, corresponding to an ES-VRH mechanism, which is predicted for disordered materials as a variable-range hopping mechanism influenced by strong Coulomb interactions. ES-VRH behavior has been observed previously in saturated molecule/gold nanoparticle assemblies and was confirmed in our 2T-AuNP assembly. Electronically active conjugated molecules were successfully incorporated between the nanoparticles, keeping the electronic structure of the gold nanoparticle and 2T moieties isolated from each other.

元の言語English
記事番号205420
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
82
発行部数20
DOI
出版物ステータスPublished - 2010 11 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

フィンガープリント Electron transport in a gold nanoparticle assembly structure stabilized by a physisorbed porphyrin derivative' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用