Monitoring of orientation in molecular ensembles by polarization sensitive nonlinear microscopy

Article Abstract:

High resolution two-photon excitation microscopy studies combining two-photon fluorescence (TPF) and second harmonic generation (SHG) is presented in order to probe orientational distributions of molecular ensembles at room temperature. The polarization analysis of TPF and SHG signals reveals that TPF provides information on specific properties pertaining to incoherent emission in molecular media such as excitation transfer and SHG, being highly sensitive to a slight departure from centrosymmetry such as induced by an external electric field in the medium, complements TPF.

Fluorescence, Electric fields, Polarization (Light)

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Multicomponent interposed carbon nanotube micropatterns by region-specific contact transfer and self-assembling

Article Abstract:

A novel approach to the first multicomponent interposed carbon nanotube micropatterns prepared by the simple and effective dry contact transfer method involving a region-selective transfer of the iron (II) phthalocyanine (FePc) generated perpendicularly-aligned carbon nanotubes onto a Scotch tape pre-patterned with a thin layer of heptylamine-plasma-treated silver, followed by region-specific adsorption of acid-oxidized carbon nanotubes interdispersed into the discrete areas in the patterned structure of aligned carbon nanotubes is presented.

Carbon compounds, Structure, Nanotubes

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Reversibly altering electronic conduction through a single molecule by a chemical binding event

Article Abstract:

Self-assembled monolayers of electron donor tetramethyl xylyl dithiol (TMXYL) are synthesized and chemically switched to a conducting state by reaction with an electron acceptor tetracyanoethylene (TCNE). Low bias conductance measurements obtained by scanning tunneling spectroscopy under ultrahigh vacuum conditions reveals a significant change from insulating to ohmic behavior.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Gold, Usage, Optical properties, Chemical synthesis, Tunneling spectroscopy

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