Ultrafast Electron Transfer between Molecule Adsorbate and Antimony Doped Tin Oxide (ATO) Nanoparticles

Guo, Jiandong; She, Chunxing; Lian, Tianquan

doi:10.1021/jp044579p

Cited by 30 publications

(74 citation statements)

References 76 publications

(207 reference statements)

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“…Because of the much stronger electron absorption cross section in SnO 2 , obtaining reliable transient absorption spectra of the adsorbate is difficult. We have previously shown that, for ReC1A [38][39][40] and ReC1P 41 on SnO 2 , the kinetic traces constructed from the oxidized peak and injected electron absorption are identical, suggesting that monitoring the electron absorption signal is sufficient in this system. The kinetic traces in Figure 9 have been normalized to correspond to the same number of absorbed photons.…”

Section: Ph Dependence Of Photophysicsmentioning

confidence: 88%

“…[37][38][39][40][41] In these systems, the <100 fs injection component is negligible and only the slow injection component from the relaxed 3 MLCT excited state is observed. Furthermore, in addition to the IR absorption of the injected electrons, the CO stretching bands of the adsorbate can also be simultaneously monitored to fully determine the injection rate and yield.…”

Section: Introductionmentioning

confidence: 99%

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pH-Dependent Electron Transfer from Re-bipyridyl Complexes to Metal Oxide Nanocrystalline Thin Films

et al. 2005

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Photoinduced interfacial electron transfer (ET) from molecular adsorbates to semiconductor nanoparticles has been a subject of intense recent interest. Unlike intramolecular ET, the existence of a quasicontinuum of electronic states in the solid leads to a dependence of ET rate on the density of accepting states in the semiconductor, which varies with the position of the adsorbate excited-state oxidation potential relative to the conduction band edge. For metal oxide semiconductors, their conduction band edge position varies with the pH of the solution, leading to pH-dependent interfacial ET rates in these materials. In this work we examine this dependence in Re(L P )(CO) 3 Cl (or ReC1P) [L P ) 2,2′-bipyridine-4,4′-bis-CH 2 PO(OH) 2 ] and Re-(L A )(CO) 3 Cl (or ReC1A) [L A ) 2,2′-bipyridine-4,4′-bis-CH 2 COOH] sensitized TiO 2 and ReC1P sensitized SnO 2 nanocrystalline thin films using femtosecond transient IR spectroscopy. ET rates are measured as a function of pH by monitoring the CO stretching modes of the adsorbates and mid-IR absorption of the injected electrons. The injection rate to TiO 2 was found to decrease by 1000-fold from pH 0-9, while it reduced by only a factor of a few to SnO 2 over a similar pH range. Comparison with the theoretical predictions based on Marcus' theory of nonadiabatic interfacial ET suggests that the observed pH-dependent ET rate can be qualitatively accounted for by considering the change of density of electron-accepting states caused by the pH-dependent conduction band edge position.

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Section: Ph Dependence Of Photophysicsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

pH-Dependent Electron Transfer from Re-bipyridyl Complexes to Metal Oxide Nanocrystalline Thin Films

et al. 2005

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“…Under these conditions the oxide surfaces were hydrated by layers of water molecules. 70,71 All MD simulations were subject to the constraint of fixed nuclear coordinates for the SnO 2 units and the siloxane linker, as in the DFT minimum energy configuration. SRhB-silane was described according to the Amber 72 molecular mechanics force field with atomic charges parametrized to fit the ab initio electrostatic potential obtained from DFT-B3LYP/6-31G(d) calculations.…”

Section: Methodsmentioning

confidence: 99%

Single-Molecule Interfacial Electron Transfer in Donor-Bridge-Nanoparticle Acceptor Complexes

et al. 2010

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Photoinduced interfacial electron transfer (IET) in sulforhodamine B (SRhB)-aminosilane-Tin oxide (SnO(2)) nanoparticle donor-bridge-acceptor complexes has been studied on a single molecule and ensemble average level. On both SnO(2) and ZrO(2), the sum of single molecule fluorescence decays agree with the ensemble average results, suggesting complete sampling of molecules under single molecule conditions. Shorter fluorescence lifetime on SnO(2) than on ZrO(2) is observed and attributed to IET from SRhB to SnO(2). Single molecule lifetimes fluctuate with time and vary among different molecules, suggesting both static and dynamic IET heterogeneity in this system. Computational modeling of the complexes shows a distribution of molecular conformation, leading to a distribution of electronic coupling strengths and ET rates. It is likely that the conversion between these conformations led to the fluctuation of ET rate and fluorescence lifetime on the single molecule level.

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“…28,29 To directly probe electron injection from RhB excited state to ATO, we have utilized transient IR absorption spectroscopy. 5,30 In this approach, average electron injection rate from an ensemble of RhB molecules to ATO were directly measured by monitoring the absorption of the injected electrons in ATO. Shown in figure 6b are kinetic traces measured on ATO and SnO 2 after 530 nm excitation.…”

Section: Sm Lifetime Of Rhb On Atomentioning

confidence: 99%

Single molecule study of Rhodamine/ATO nanoparticle junctions

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Guo

Yuan

et al. 2005

Physical Chemistry of Interfaces and Nanomaterials IV

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Single rhodamine B (RhB) molecule-Sb:SnO 2 (ATO) nanoparticle junctions were studied using two-photon excitation single molecule fluorescence spectroscopy. For each molecule-nanoparticle junction, fluorescence decay of RhB was found to be single exponential, indicating a static heterogeneous distribution of junction properties. The measured fluorescence lifetime is shorter than RhB on inert substrates but longer than that expected on ATO based on ensemble averaged electron transfer rates. Possible origins for the shorten single molecule lifetimes and distribution are discussed.

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Ultrafast Electron Transfer between Molecule Adsorbate and Antimony Doped Tin Oxide (ATO) Nanoparticles

Cited by 30 publications

References 76 publications

pH-Dependent Electron Transfer from Re-bipyridyl Complexes to Metal Oxide Nanocrystalline Thin Films

pH-Dependent Electron Transfer from Re-bipyridyl Complexes to Metal Oxide Nanocrystalline Thin Films

Single-Molecule Interfacial Electron Transfer in Donor-Bridge-Nanoparticle Acceptor Complexes

Single molecule study of Rhodamine/ATO nanoparticle junctions

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