Distance Dependence of the Electric Field Effect on Photoinduced Electron Tunneling between Cyanine Dye and Viologen through a Fatty Acid Monolayer

Ito, Takashi; Yamazaki, Iwao; Ohta, Nobuhiro

doi:10.1021/jp0127566

Cited by 10 publications

(2 citation statements)

References 19 publications

(41 reference statements)

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“…These values of β are still, however, within values quoted for other systems, although these are for saturated systems. For example, Ohta et al reported a β value of 0.23 Å −1 (equivalent to 0.3 per -CH 2 -) for electron tunneling from cyanine dye to viologen through a fatty acid, and in DNA systems values between 1.4 and 0.1 Å −1 (1.8 and 0.13 per methylene group) have been reported for double strands, − while Vanmaekelbergh and co-workers , have quoted β-values of 0.5 Å −1 (0.6 per -CH 2 -) for CdSe quantum dots linked to gold surfaces by nonsaturated dithiols. However, very recently β values have been quoted of 0.69 Å −1 (0.88 per -CH 2 -) for 4-nm gold particles and 0.40 Å −1 (0.51 per -CH 2 -) for 2-nm gold particles …”

Section: Resultsmentioning

confidence: 99%

Self-Assembled Carbon Nanotube Electrode Arrays: Effect of Length of the Linker between Nanotubes and Electrode

et al. 2009

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The influence of the length of the carbon chain of a self-assembled monolayer (SAM) on gold electrodes on the electrochemical performance of carbon nanotube arrays attached to the SAM was explored. Four electrode constructs were assessed, all of which were modified with four different lengths (C2−C11) of amine-terminated alkanethiols. The four constructs were gold electrodes modified (1) with SAMs alone, (2) with carbon nanotubes randomly dispersed onto the SAM-modified electrodes by drop coating, (3) with vertically aligned carbon nanotubes formed by self-assembly onto the SAMs, and (4) with vertically aligned nanotubes with ferrocene attached to the nanotubes. By use of ruthenium hexaammine as a redox probe, the attachment of the carbon nanotubes to the SAM, either randomly dispersed or aligned, enabled electrochemistry to be observed at SAMs that were passivating prior to attachment of the nanotubes. The electrochemistry decayed exponentially with methylene chain length as expected but with a surprisingly low attenuation factor (β value) for the nanotube-modified surfaces. For randomly dispersed nanotubes, the β value was 0.27 per -CH2- (s = 0.04, n = 4), and for the vertically aligned nanotubes, 0.66 per -CH2- (s = 0.04, n = 4). A similar β value of 0.62 per -CH2- for vertically aligned nanotubes with ferrocene attached provided good evidence that the results with ruthenium hexaammine were due to tunneling through the SAM rather than electrochemistry proceeding via defects in the SAM or the nanotubes penetrating the SAM to the underlying electrode.

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Section: Resultsmentioning

confidence: 99%

Self-Assembled Carbon Nanotube Electrode Arrays: Effect of Length of the Linker between Nanotubes and Electrode

et al. 2009

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“…Values of

∆ k_{et}

estimated here show an effective linearity in retarding the electron transfer upon increasing the PCBM concentration. As reported, [ 27,38 ] the effect of an electric field on the rate of photoinduced electron transfer depends strongly on the donor‐acceptor distance. Even in the same pair of donor and acceptor molecules, electron transfer was theoretically shown to be accelerated and decelerated on application of an electric field, depending on the donor‐acceptor distance.…”

Section: Resultsmentioning

confidence: 93%

Photoluminescence of P3HT:PCBM bulk heterojunction thin films and effect of external electric field

Narra

Tsai

Awasthi

et al. 2021

J Chinese Chemical Soc

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Steady‐state and time‐resolved photoluminescence (PL) and electrophotoluminescence (E‐PL) have been recorded for bulk heterojunction samples of thin films of regio‐regular poly(3‐hexylthiophene) (P3HT) and methyl [6,6]‐phenyl‐C61‐butanoate (PCBM). The PL spectra of the bulk heterojunction samples showed a monotonic decrease of PL quantum yield with increased PCBM content in the film. The PL decay was measured with both a femtosecond up‐conversion technique and a time‐correlated single‐photon‐counting technique. The mechanism of PL quenching deviated from a simple Stern‐Volmer equation, explained in terms of an apparent static quenching with a sphere‐of‐action model and dynamic quenching. With increased content of PCBM, the static quenching played a dominant role. Upon application of an electric field, the E‐PL spectra of both P3HT and bulk heterojunction samples showed an enhanced quantum yield and incremented lifetime of PL of P3HT. The long‐range electron transfer from P3HT to PCBM was retarded upon application of an electric field; the field‐induced change increased with increasing PCBM content.

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Layer-by-layer assembly of single-walled carbon nanotube–poly(viologen) derivative multilayers and their electrochemical properties

Wang

Huang

Liu

et al. 2006

Carbon

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Distance Dependence of the Electric Field Effect on Photoinduced Electron Tunneling between Cyanine Dye and Viologen through a Fatty Acid Monolayer

Cited by 10 publications

References 19 publications

Self-Assembled Carbon Nanotube Electrode Arrays: Effect of Length of the Linker between Nanotubes and Electrode

Self-Assembled Carbon Nanotube Electrode Arrays: Effect of Length of the Linker between Nanotubes and Electrode

Photoluminescence of P3HT:PCBM bulk heterojunction thin films and effect of external electric field

Layer-by-layer assembly of single-walled carbon nanotube–poly(viologen) derivative multilayers and their electrochemical properties

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