Photophysical Properties of C<sub>60</sub> Colloids Suspended in Water with Triton X-100 Surfactant: Excited-State Properties with Femtosecond Resolution

Clements, Andrew F.; Haley, Joy E.; Urbas, Augustine; Kost, Alan; Rauh, R. D.; Bertone, Jane F.; Wang, Fei; Wiers, Brian M.; Gao, De; Stefanik, Todd; Mott, Andrew G.; Mackie, David M.

doi:10.1021/jp8102518

Cited by 16 publications

(19 citation statements)

References 88 publications

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“…In addition, the triplet state lifetime of C 60 was 343 ns in the TPP/C 60 mixture, similar to the reported value 330 ns for C 60 alone [19,20]. This suggests weak or no interaction between TPP and C 60 in the mixture.…”

Section: Nanosecond Transient Absorptionsupporting

confidence: 85%

Photoinduced charge transfer in porphyrin-C60 oligomer

et al. 2010

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Photoinduced electron transfer (ET) between C 60 and porphyrin (P) in a new polymer containing porphyrin, poly(p-phenylenevinylene), and pendant fullerene units has been investigated by nanosecond transient absorption and phosphorescence spectroscopy. Compared to the physically doping material systems, binding porphyrin/C 60 through chemical bonds in a polymer detains the formation of the triplet states of porphyrins and C 60 . The formation of intermediate charge transfer state (CSS) of P ·+ -C 60 · was observed, which led to the delayed formation of triplet states of porphyrins and C 60 . The reduced opto-electronic properties, such as optical limiting performance, were also observed, which resulted from the delayed formation of triplet states. The results presented in this article are significant in understanding the complicated spectral characteristics of the triplet state and charge transfer of the porphyrin and C 60 complexes, and are therefore related to the controllable performance of the new materials in applications. intramolecular charge transfer (ICT), triplet-triplet absorption, donor-acceptor compound

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Section: Nanosecond Transient Absorptionsupporting

confidence: 85%

Photoinduced charge transfer in porphyrin-C60 oligomer

et al. 2010

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“…This is in stark contrast to other nanomaterials such as carbon nanotubes 32 or C 60 fullerenes, 33 where anionic surfactants generally lead to strong exciton quenching. This robustness highlights the viability of surfactant-assisted liquid processing (exfoliation, deposition, printing, etc) of MoS 2 and other semiconducting TMDs.…”

Section: Resultsmentioning

confidence: 71%

Femtosecond spectroscopy on MoS₂flakes from liquid exfoliation: surfactant independent exciton dynamics

et al. 2015

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Abstract. Ionic surfactants, which are widely used to stabilize nanomaterials in dispersions, can drastically alter the nanomaterial's photophysical properties. Here, we use femtosecond optical spectroscopy to study the dynamics of excitons and charges in few-layer flakes of the twodimensional semiconductor MoS 2 . We compare samples obtained via exfoliation in water with different amounts of adsorbed sodium cholate, obtained by repeated washing of the dried flakes. We find that the femtosecond dynamics is remarkably stable against the surfactant adsorption, with a slight increase of the initial exciton quenching occurring during the first few picoseconds as the only appreciable effect.

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“…It has been reported that defects inside solids can easily act as quenchers or trap sites. 14,20 It is notable that the reported intrinsic (monomeric) decay time of the singlet excited state of C 60 thin films is about 100 ps, 24 which is approximately 10 times that of nC 60 in water. It could be considered that the singlet excited state is quenched efficiently at the nanoparticle/ water interface.…”

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confidence: 99%

“…20,24,25 Recently, Clements et al reported similar results of transient absorption experiments on nC 60 dispersed in a micellar solution of Triton X-100 and water. 14 They attributed the shortened lifetime to singlet annihilation; however, they did not examine the excitation intensity dependence.…”

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confidence: 99%

“…Several species such as ionized states, hot-ground states, trapped sites, and impurities can be candidates for long-lived components. 14,20 It has been reported that C 60 cation and anion radicals have characteristic bands at 980 nm 26 and 1070 nm, 22 respectively. However, the spectrum of nC 60 in water at 500 ps in the near-infrared region did not show such absorption bands.…”

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confidence: 99%

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Excited-state Dynamics of Fullerene Nanoparticles Dispersed in Pure Water

et al. 2012

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Femtosecond transient absorption dynamics of C 60 nanoparticles in pure water revealed a strong quenching of the singlet excited state, independent of the excitation light intensity on a 10-ps time scale, and an extremely low yield of the triplet state of C 60 nanoparticles upon photoexcitation.Fullerene (C 60 ) has received a considerable amount of attention due to its unique physical and chemical properties, and it is now recognized to have great potential in various research fields such as electronics, medicine, and biology. Although a pure molecular solution of C 60 in pure water cannot be prepared, C 60 forms stable colloidal assemblies in water under certain conditions. 15 The relatively high solubility of C 60 nanoparticles, herein termed as nC 60 , in water has raised concerns regarding their potential impact on human and ecological systems, because there are reports of significant cytotoxicity effects. 611 Furthermore, the photophysical properties of nC 60 , particularly the generation of reactive oxygen species, have been of interest for potential explorations for the photodynamic therapy. Some studies have been on the photophysical properties of nC 60 dispersed in water have been carried out. 4,1214 Colloidal suspensions of nC 60 in water with a particle size less than 100 nm are formed by several methods, including reprecipitation, 1 solvent replacement, 2 and ultrasonication. 3 In these preparation methods, C 60 is first dissolved in organic solvents such as toluene and THF, which are highly toxic to living cells and tissues, and nC 60 is then solubilized with the aid of a surfactant or a polymer in some cases. For biological studies and medical applications, an aqueous colloid of nC 60 without any chemical additives is of interest and can be prepared by the laser ablation method.5 By exposing a suspension of C 60 powder in pure water to an intense pulse laser, nC 60 with a mean size of 50 nm are formed and the prepared colloidal solution is very stable over one month without any surfactants. 4 This letter reports on the excited-state dynamics of aqueous colloids of nC 60 prepared by laser ablation. We present, for the first time, the transient absorption spectra and kinetic lifetimes of the photoexcited state of nC 60 dispersed in pure water with femtosecond temporal resolution. Moreover, we demonstrate a very rapid decay of the singlet excited state that is independent of the excitation light intensity and results in a very low yield of the triplet excited state concerning aqueous nC 60 suspensions.Aqueous colloids of nC 60 with a mean diameter of ca. 50 nm were prepared by laser ablation; 4 in this method, C 60 microcrystal powder (>99.9% pure, Sigma-Aldrich) suspended in pure water (1 © 10 ¹2 wt %) was irradiated with the second harmonic (532 nm) of nanosecond YAG laser pluses (FWHM: 7 ns; repetition rate: 10 Hz) for 1 h. Samples were measured using a femtosecond transient absorption measurement system. 15 The wavelength of the excitation pulse was set to 350 nm, and its pulse duration was c...

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Photophysical Properties of C₆₀ Colloids Suspended in Water with Triton X-100 Surfactant: Excited-State Properties with Femtosecond Resolution

Cited by 16 publications

References 88 publications

Photoinduced charge transfer in porphyrin-C60 oligomer

Photoinduced charge transfer in porphyrin-C60 oligomer

Femtosecond spectroscopy on MoS₂flakes from liquid exfoliation: surfactant independent exciton dynamics

Excited-state Dynamics of Fullerene Nanoparticles Dispersed in Pure Water

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Photophysical Properties of C60 Colloids Suspended in Water with Triton X-100 Surfactant: Excited-State Properties with Femtosecond Resolution

Cited by 16 publications

References 88 publications

Photoinduced charge transfer in porphyrin-C60 oligomer

Photoinduced charge transfer in porphyrin-C60 oligomer

Femtosecond spectroscopy on MoS2flakes from liquid exfoliation: surfactant independent exciton dynamics

Excited-state Dynamics of Fullerene Nanoparticles Dispersed in Pure Water

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Product

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Photophysical Properties of C₆₀ Colloids Suspended in Water with Triton X-100 Surfactant: Excited-State Properties with Femtosecond Resolution

Femtosecond spectroscopy on MoS₂flakes from liquid exfoliation: surfactant independent exciton dynamics