The relationship between structures and photocurrent generation
properties in a series of dye congeners based
on a hemicyanine template has been investigated by using their LB film
modified ITO electrodes in a traditional
three-electrode cell under the same conditions. Experimental data
and semipirical quantum calculation results
show that the molecular polarity is the key factor for the quantum
yield of photocurrent generation in this
kind of molecule. The effect of applied bias voltage, addition of
electron donors and acceptors, and saturation
degree of O2 or N2 on photocurrent generation
of the selected one has also been examined.
A new photoelectric method for analyzing cell-free apoptosis had been developed with ITO (a transparent electrode of indium-tin oxide coated borosilicate) technology. The C5710 mice liver nuclei responded with a negative photoelectric current pulse to white light (200-800nm). During the apoptosis of liver nuclei induced by dATP (deoxyadenosine-5-triphosphate), the photoelectric current showed a dynamic decrease, which was in accordance with the results of fluorescence microscopy and agarose gel electrophoresis. This photoelectric analytical method might provide a rapid and sensitive way to evaluate apoptosis quickly and in a continuous fashion.
Paper 9/00317GFig. 5 DNA fragmentation and morphological change of C5710 mice liver nuclei in the time course of apoptosis. The left photo was the result of agarose gel electrophoresis, and the right photo was the result of fluorescence microscopy.
Photocurrent generation from LangmuirÈBlodgett (LB) overlays on indium tin oxide (ITO) electrodes, where the active components are 2,4-bis[4-(dibutylamino)-2-hydroxyphenyl]squaraine (1) and the unsubstituted analogue, 2,4-bis[4-(dibutylamino)phenyl]squaraine (2), have been investigated. Dye 1 shows improved behaviour compared with the latter and di †erences in performance are attributed to a modiÐed aggregate structure, this being indicated by variations in the LB Ðlm spectra. The photocurrent generation is enhanced by the presence of electron acceptors, e.g. N,N@-dimethyl-4,4@-bipyridinium diiodide (MV2`), but quenched by electron donors, e.g. hydroquinone (HQ). The concentration dependence is reported.
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