The low frequency noise of single-walled carbon nanotubes is studied over the 77–300K temperature range. Lorentzian shaped spectra along with 1∕f noise spectra have been observed. From the Lorentzian noise components, a range of thermal activation energies from 0.08to0.51eV for the associated fluctuation mechanisms is obtained. From the 1∕f noise spectra, a distribution of activation energies of fluctuation processes ranging from 0.2to0.7eV is derived. These findings indicate that the observed noise spectra are caused by number fluctuations.

The charge transport and noise properties of three terminal, gated devices containing multiple single-wall metallic and semiconducting carbon nanotubes were measured at room temperature. Applying a high voltage pulsed bias at the drain terminal the metallic tubes were ablated sequentially, enabling the separation of measured conductance and 1∕f noise into metallic and semiconducting nanotube contributions. The relative low frequency excess noise of the metallic tubes was observed to be two orders of magnitude lower than that of the semiconductor tubes.

The transfer of PtCl62− ions into the organic phase facilitated by TOA+ is the very first step in the Brust‐Schiffrin (BS) two‐phase synthesis of monolayer protected Pt nanoparticles. However, the stoichiometry between TOA+ and PtCl62− during the facilitated transfer process is still unknown. In this paper, a hemispherical micro‐liquid/liquid interface, which is formed between a PtCl62− aqueous filled micropipette and an organic phase, has been employed to study the stoichiometry of TOA+ facilitated transfer of PtCl62−. Due to the even diffusion field at the hemispherical micro‐liquid/liquid interface, the theoretical i‐V curve for TOA+ facilitated transfer of PtCl62− can be derived in a simple way. By simulating the theoretical i‐V curve to the experimental voltammogram, the stoichiometry of TOA+ facilitated transfer of PtCl62− was evaluated to be 8.

The excess noise of single-walled carbon nanotubes is studied over the 77K to 300K temperature range. Lorentzian shaped spectra along with 1/f noise spectra are observed. From the Lorentzian noise components activation energies of 0.21 and 0.46eV for the associated fluctuation mechanisms are obtained.