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Efficient Energy-Conversion Materials for the Future: Understanding and Tailoring Charge-Transfer Processes in Carbon Nanostructures Volker Strauss, Alexandra Roth, Michael Sekita, Dirk M. Guldi Chem Volume 1, Issue 4, Pages (October 2016) DOI: /j.chempr Copyright © Terms and Conditions
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Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 1 exTTF-(crown ether)2/C60
(A) Absorption spectra of dilute chlorobenzene solutions of a exTTF-(crown ether)2 derivative (1.5 × 10−5 M) with variable concentrations of C60 upon subtraction of the fullerene absorption to highlight the absorption changes and the isosbestic points. (B) Differential absorption spectra (visible and near-infrared) obtained upon femtosecond pump-probe experiments (λex = 480 nm) of exTTF-(crown ether)2/C60 in argon-saturated chlorobenzene with several time delays between 0 and 125 ps at room temperature. (C) Time-absorption profiles at 550 nm (gray) and 675 nm (black) monitoring the charge separation and charge recombination. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 2 SubPc/C60 (A) Differential absorption spectra (visible and near-infrared) obtained upon femtosecond pump-probe experiments (λex = 320 nm) of (perfluoro-SubPc)-C60 (10−5 M) in argon-saturated toluene with several time delays between 0 and 150 ps at room temperature. (B) Time-absorption profiles of the spectra shown in (A) at 576 nm (black) and 591 nm (gray) monitoring the charge separation and the charge recombination. (C) Differential absorption spectra (visible and near-infrared) obtained upon femtosecond pump-probe experiments (λex = 387 nm) of (sulfonyl-SubPc)-C60 (10−5 M) in argon-saturated toluene with several time delays between 0 and 150 ps at room temperature. (D) Time-absorption profiles of the spectra shown in (C) at 589 nm (black) and 608 nm (gray) monitoring the charge separation and the charge recombination. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 3 PDI Dimer/SWCNTs
(A) Cryo-TEM image of PDI dimer/SWCNTs in chloroform dispersion. (B) A model of PDI dimer/SWCNTs in a space-filling representation: (6,5) SWCNTs (blue). PDI dimers (with one PEG unit) are in red, yellow, and cyan. (C) Near-infrared emission spectra of a PDI dimer upon sequential enrichment with SWCNTs in CHCl3 and excitation at 650 nm at room temperature. Arrows indicate evolution with increasing amounts of PDI dimer. (D) Differential absorption spectra (visible and near-infrared) obtained upon pump-probe experiments (532 nm) of PDI dimer/SWCNTs in CHCl3 with several time delays between 0 and 7,500 ps at room temperature. (E) Time-absorption profiles at 850 (black) and 1,000 nm (gray) of the spectra shown in (D) monitoring the charge separation and charge recombination. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 4 SWCNTs Interlocked with exTTF Macrocycles
(A) TEM images (80 kV) of mechanically interlocked SWCNTs with exTTF macrocycles drop cast from an MeOH dispersion. (B) Differential absorption spectra obtained upon pump-probe experiments (387 nm) of mechanically interlocked SWCNTs with exTTF macrocycles in SDBS/D2O (1 wt %) with several time delays between 0.6 and 500 ps at room temperature. (C) Time-absorption profiles at 969 (black) and 1,030 nm (gray) monitoring the charge separation and charge recombination. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 5 Graphene/ZnPc-Py
(A) Absorption spectra of the stepwise enrichment of ZnPc-Py with graphene. (B) Fluorescence spectra of the stepwise enrichment of ZnPc-Py with graphene. (C) AFM image of graphene/ZnPc-Py. (D) Three height profiles taken from the AFM image in (C). Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 6 Graphene/exTTF
(A) Raman spectrum of graphene-exTTF (G-exTTF) on a SiO2 wafer. (B) TEM image of G-exTTF showing a section of a few-layered functionalized graphene flake. (C) XPS analysis of G-exTTF with N1s deconvoluted components in the inset. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 7 PDI2+/Carbon Nanodots
(A) Absorption spectra of PDI2+ (black) during the course of a titration with pCND (gray > red > blue > orange) in phosphate-buffered D2O (pH 7.2) at room temperature. (B) Fluorescence spectra of PDI2+ (blue) during the course of a titration with pCND (orange > blue > red > gray) in phosphate-buffered D2O (pH 7.2) at room temperature. (C) Ground-state molecular electrostatic potentials of pCND/PDI2+ (top row) and molecular electrostatic potentials of the respective lowest-energy charge-transfer states (bottom row). Color code is from −0.2 (blue) to 0.2 (red) Hartree e−1. (D) Differential absorption spectra (visible and near-infrared) obtained upon pump-probe experiments (532 nm) of pCND/PDI2+ in phosphate-buffered D2O (pH 7.2) with several time delays between 0.1 and 12 ps at room temperature. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Figure 8 PDI6–/phG (A) TEM images of phG drop cast from a chloroform dispersion. (B) A model of PDI6−/phG. (C) Absorption spectra of a solution of PDI6− (black) upon sequential addition of phG (gray > red > blue) in phosphate-buffered H2O (pH 7.2). (D) Differential absorption spectra (visible and near-infrared) obtained upon pump-probe experiments (532 nm) of PDI6−/phG in phosphate-buffered H2O (pH 7.2) with several time delays between 1.5 and 2,000 ps at room temperature. (E) Time-absorption profiles at 505 (black) and 605 nm (gray) of the spectra shown in (D) monitoring the charge separation and charge recombination. Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Scheme 1 Fullerenes and Photosensitizers
Illustration of fullerenes C60, and molecular structures of representative photosensitizers based on porphyrins (ZnP) (red), corroles (light red), phthalocyanines (ZnPc) (green), π-extended TTFs (exTTF) (orange), tetracyanoanthracenoquinone (TCAQ) (purple), and subphtalocyanine (SubPc) (blue). Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Scheme 2 Carbon Nanotubes and Photosensitizers
Single-walled carbon nanotube (SWCNT) and molecular structures of representative photosensitizers based on phthalocyanines (ZnPc) (green), π-extended TTFs (exTTF) (yellow), and rylenes (pink and purple). Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Scheme 3 Graphene and Photosensitizers
Illustration of a graphene sheet and molecular structures of representative photosensitizers based on phthalocyanines (ZnPc) (green), π-extended TTFs (exTTF) (orange), and porphyrins (ZnP) (red). Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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Scheme 4 Defectuous Carbon Nanostructures and Photosensitizers
Illustration of polyhydrogenated graphene (phG) (top), carbon nanodots (CND) (bottom left), and molecular structures of photosensitizers based on perylenediimide (red). Chem 2016 1, DOI: ( /j.chempr ) Copyright © Terms and Conditions
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