Topic
Conductance
About: Conductance is a research topic. Over the lifetime, 8088 publications have been published within this topic receiving 235961 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors studied photoinduced electron injection efficiencies from modular assemblies of a Zn-porphyrin dye and a series of linker molecules which are axially bound to the Znporphryin complex and covalently bound to TiO2 nanoparticles.
Abstract: High performance dye-sensitized solar cells (DSSCs) rely upon molecular linkers that allow efficient electron transport from the photoexcited dye into the conduction band of the semiconductor host substrate. We have studied photoinduced electron injection efficiencies from modular assemblies of a Zn-porphyrin dye and a series of linker molecules which are axially bound to the Zn-porphyrin complex and covalently bound to TiO2 nanoparticles. Experimental measurements based on terahertz spectroscopy are compared to the calculated molecular conductance of the linker molecules. We find a linear relationship between measured electron injection efficiency and calculated single-molecule conductance of the linker employed. Since the same chromophore is used in all cases, variations in the absorptivities of the adsorbate complexes are quite small and cannot account for the large variations in observed injection efficiencies. These results suggest that the linker single-molecule conductance is a key factor that shou...
58 citations
TL;DR: It is demonstrated that the conductance of conical nanocapillaries shows similar behavior to silicon oxide nanopores at low and high KCl concentrations, and it is shown that DNA translocations in high K Cl concentrations cause a reduction in the ionic current.
Abstract: We study the effect of salt concentration on the ionic conductance and translocation of single DNA molecules through nanocapillaries made out of quartz glass. DNA translocation experiments were performed in aqueous solution for concentrations of KCl between 10 mM and 2 M while ion conductance was characterized from 1 mM to 2 M KCl concentration. Here, we develop a model for the conductance of conical nanocapillaries taking into consideration the surface charge of the quartz glass. We demonstrate that the conductance of our nanocapillaries shows similar behavior to silicon oxide nanopores at low and high KCl concentrations. Finally, we show that DNA translocations in high KCl concentrations (400 mM-2 M) cause a reduction in the ionic current. In contrast, DNA translocations at low KCl concentrations (10-300 mM) lead to increases in the ionic current. Our new results, which until now have not been shown for nanocapillaries, can be well understood with an adapted model.
58 citations
TL;DR: In this paper, the electrical conductance of single C60 and benzene molecules bridging between Pt electrodes was investigated at room temperature in ultrahigh vacuum, and the conductance was 0.7 G0(2e2/h) which was close to that of the metal atomic contact.
Abstract: The electrical conductance of single C60 and benzene molecules bridging between Pt electrodes was investigated at room temperature in ultrahigh vacuum. The conductance of the Pt/C60/Pt junction was 0.7 G0(2e2/h), which was close to that of the metal atomic contact. The single C60 molecular junction showed a high and fixed conductance value, by the direct binding of the C60 to the Pt electrodes without using anchoring group. The conductance of the Pt/C60/Pt junction decreased and its stability increased with the amount of deposited C60 molecule, which could be explained by the C60 adsorption on the stem part of the electrode. In contrast with the Pt/C60/Pt junction, the Pt/benzene/Pt junction did not show a fixed conductance value, reflecting the planar molecular shape.
58 citations
TL;DR: The addition of 2 M formic acid at pH 3.75 increased the single channel H+ ion conductance of gramicidin channels 12-fold at 200 mV, suggesting that greater than 90% of the total resistance to H+ results from diffusion limitation in the bulk solution.
58 citations
TL;DR: In this article, the conductance through two quantum dots connected in series is studied below the Kondo temperature, based on the slave boson formalism of the Anderson model, and the transport properties are characterized by the ratio of the magnitude of the tunneling coupling between two dots to the width of the level broadening.
Abstract: The conductance through two quantum dots connected in series is studied below the Kondo temperature, based on the slave boson formalism of the Anderson model. The transport properties are characterized by the ratio of the magnitude of the tunneling coupling between two dots to the width of the level broadening. When the ratio is less than unity, the Kondo resonant states are formed between each dot and an external lead, and the conductance is determined by the hopping between the two resonant states. When the ratio is larger than unity, these Kondo resonances are split into the bonding and antibonding peaks, which are located below and above the Fermi level in the leads, respectively, for low gate voltages. As a result, the conductance is suppressed. The conductance has a maximum of 2e 2 /h when the bonding peak is matched with the Fermi level by controlling the gate voltage.
58 citations