Tuning Electron Transfer Rates via Systematic Shifts in the Acceptor State Density Using Size-Selected ZnO Colloids

Huss, Adam S.; Bierbaum, Andrew Joseph; Chitta, Raghu; Ceckanowicz, Darren J.; Mann, Kent R.; Gladfelter, Wayne L.; Blank, David A.

doi:10.1021/ja104482t

Cited by 35 publications

(36 citation statements)

References 24 publications

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“…The basic goal of this experiment was to verify the possible electron transfer process between Ru(II) photosensitizer and ZnO semiconductor. Previous reports have demonstrated the electron injection between sensitizer dyes (such as ruthenium bipyridine complexes and zinc porphyrin) to ZnO . As shown in Figure , emission intensity from complexes decreases with the addition of a higher nanoparticle concentration.…”

Section: Resultsmentioning

confidence: 78%

ZnO Nanoparticles Photosensitization Using Ruthenium(II)‐polypyridyl Isomeric Complexes

et al. 2020

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The coordination of photosensitizing dyes to zinc oxide nanoparticles (ZnO NPs) has attracted extensive attention as promising candidates for applications in solar cells. Here, we report the synthesis of ZnO NPs functionalized with geometric isomers of ruthenium(II)‐polypyridyl complexes and a preliminary study of their photophysical properties by fluorescence spectroscopy. ZnO NPs synthesis was carried out by direct precipitation. IR, UV‐Vis spectroscopy, XRD and TG‐DTA techniques were used for ZnO NPs characterization. Trans and cis complexes of Ru(II) using 2,2′‐bipyridine and 2,2’‐bipyridine‐4,4’‐dicarboxylic acid as ligands were assembled to ZnO NPs. The presence not only of a band of around 355 nm, but also at 465 nm, in the electronic spectrum indicates the modification of the ZnO surface with the synthesized complexes. The fluorescence behaviour of Ru(II) complexes modified ZnO NPs suggested an electron transfer process through the system. Remarkably, the trans isomer modified system showed better response during the electron transfer. This information could be considered during the design of photoanodes in Dye‐Sensitized Solar Cells.

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Section: Resultsmentioning

confidence: 78%

ZnO Nanoparticles Photosensitization Using Ruthenium(II)‐polypyridyl Isomeric Complexes

et al. 2020

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“…270 By and large, chemisorption is the most used method because of the basic character of the ZnO surface. Thus, porphyrins containing functional groups with acidic OH (carboxylic acid, 219,271,272,274,[276][277][278]281,[285][286][287]291,[293][294][295]297,298 sulfonic acid 279,283,284 and cathecol 275,282 ) were easily grafted onto ZnO 2 .…”

Section: Zinc Oxidementioning

confidence: 99%

“…271 The available density of states was tuned by controlling the relative position of the ZnO band edge using quantum confinement. The resulting change in the rate was consistent with a simple model of the state density as a function of energy above the ZnO band edge.…”

Section: Zinc Oxidementioning

confidence: 99%

Porphyrins as Active Components for Electrochemical and Photoelectrochemical Devices

Galloni¹,

Vecchi²,

Coletti³

et al. 2014

Handbook of Porphyrin Science

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“…These can have varying morphology, most commonly nanocolloids, nanotubes, and nanowires. 7,8 TiO 2 nanocolloidal films are by far the most frequently used metal-oxide substrates in fundamental research and practical applications. An important reason for the dominance of TiO 2 is the inherent chemical stability of its surface, which is inert against strong acids at room temperature and requires extreme conditions for etching.…”

mentioning

confidence: 99%

Morphology-Preserving Sensitization of ZnO Nanorod Surfaces via Click-Chemistry

He¹,

Abraham²,

Fan

et al. 2018

J. Phys. Chem. Lett.

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Films of ZnO nanorods grown by chemical vapor deposition were functionalized with a chromophore in a stepwise process that preserves the surface morphology. In the first step, the ZnO nanorods were functionalized by exposure to prop-2-ynoic acid (propiolic acid) in vacuum, which did bind through the COOH group leading to a ZnO surface functionalized with ethyne moieties (ethyne/ZnO). In the second step, 9-(4-azidophenyl)-2,5-di-tert-butylperylene (DTBPe-Ph-N) was reacted with the ethyne/ZnO surface via copper-catalyzed azide-alkyne click reaction (CuAAC) in solution to form the DTBPe-functionalized surface (DTBPe/ZnO). The ZnO morphology was preserved after each step, as demonstrated by scanning electron microscopy (SEM). Each step was probed by X-ray photoelectron spectroscopy (XPS), and transient absorption spectroscopy (TA) of the resulting DTBPe/ZnO surface shows interfacial electron transfer following visible light excitation. As expected, attempts to bind the reference compound 1-(4-(8,11-ditert-butylperylen-3-yl)-phenyl)-1H-1,2,3-triazole-4-carboxylic acid (DTBPe-Ph-Tz-COOH) directly from solution lead to etched surfaces (confirmed by SEM) and undefined binding modes (confirmed by TA).

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Tuning Electron Transfer Rates via Systematic Shifts in the Acceptor State Density Using Size-Selected ZnO Colloids

Cited by 35 publications

References 24 publications

ZnO Nanoparticles Photosensitization Using Ruthenium(II)‐polypyridyl Isomeric Complexes

ZnO Nanoparticles Photosensitization Using Ruthenium(II)‐polypyridyl Isomeric Complexes

Porphyrins as Active Components for Electrochemical and Photoelectrochemical Devices

Morphology-Preserving Sensitization of ZnO Nanorod Surfaces via Click-Chemistry

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