Synthesis and characterization of C/Cu core–shell particles by hydrogen-free spray pyrolysis assisted with citric acid and sucrose

Jung, Kyeong Youl; Lee, Hyunmi; Heo, Soon Young

doi:10.1016/j.materresbull.2013.05.053

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…The weak absorption band at approximately 400 nm can be assigned to a partially forbidden S 2 ←S 0 transition. 14 Since 3 and 4 have longer π-conjugation by the acetylene bridges, the absorbance at <375 nm increases accordingly. The absorption intensities of 3-6 with two BODIPY units are approximately double those with one BODIPY unit in 1 and 2.…”

Section: Resultsmentioning

confidence: 99%

“…As discussed above, however, it is known that the S 2 state of BODIPY is usually deactivated very quickly through the internal conversion (IC) process to the lowest excited singlet (S 1 ) state. 14 Therefore, the PET from the S 2 state would take place competitively with the internal conversion process. On the other hand, the ΔG PET values for the S 1 state are determined to be −0.02 and −0.08 eV for 5 and 6, respectively.…”

Section: Resultsmentioning

confidence: 99%

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BODIPY functionalized o-carborane dyads for low-energy photosensitization

et al. 2015

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A new type of organic dyad that can induce low-energy photosensitization has been developed; electron donor and electron acceptor units are boron dipyrromethene (BODIPY) and ortho-carborane (o-Cb), respectively. The new dyads consist of a V-shaped BODIPY-(o-Cb)-BODIPY molecular array in which two BODIPY units are substituted onto two adjacent carbon atoms of the central o-Cb. In the presence of the o-Cb unit, as an electron acceptor, significant fluorescence quenching was observed which indicated that photoinduced electron transfer (PET) had occurred from the end-on BODIPY units to the central o-Cb with PET efficiencies of 63-71%. As a result, the corresponding cationic and anionic species that are responsible for the charge transfer state were detected by the serial spectroelectrochemical studies: cationic BODIPY radicals at 400 nm at the applied voltage of 1.44 V and broad absorption bands of anionic o-Cb radicals in the range of 250-490 nm at -1.84 V. Transient absorption studies further confirmed the BODIPY radical anion at 540 nm and the o-Cb radical anion at 350-475 nm with a structureless broad band.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

BODIPY functionalized o-carborane dyads for low-energy photosensitization

et al. 2015

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“…Time-resolved fluorescence spectra were measured using a single photon counting method with a streak scope (Hamamatsu Photonics, C10627-03) equipped with a polychromator (Acton Research, SP2300). 39 An ultrashort laser pulse was generated with a Ti:sapphire oscillator (Coherent, Vitesse, FWHM 100 fs) pumped with a diode-pumped solid-state laser (Coherent, Verdi). High-power (1.5 mJ) pulses were generated using a Ti:sapphire regenerative amplifier (Coherent, Libra, 1 kHz).…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

A detailed investigation of light-harvesting efficiency of blue color emitting divergent iridium dendrimers with peripheral phenylcarbazole units

Cho

Wee

Son

et al. 2014

Phys. Chem. Chem. Phys.

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The increase in phosphorescence efficiency was estimated by the energy transfer mechanism for divergent iridium dendrimers with peripheral phenylcarbazole units. A series of Ir-core/phenylcarbazole-end dendrons of the type, Ir(dfppy)2(pic-Czn) (Gn, n = 0, 1, 2, and 3), was synthesized, where dfppy, pic, and Czn (n = 2, 4, and 8) are 2-(4,6-difluorophenyl)pyridine, picolinate substituted with Czn at the 3-position, and 4-(9-carbazolyl)phenyldendrons connected with 3,5-di(methyleneoxy)benzyloxy branches, respectively. Selective excitation of the Czn units of G1–G3 resulted in >90% quenching of the Cz fluorescence accompanied by the growth of phosphorescence from the Ir(dfppy)2(pic) core as a consequence of energy transfer from the excited-singlet Czn chromophore to the core. The rate constants of energy transfer were determined by steady-state and transient spectroscopic measurements to be 4.32 × 10(9) s(−1) (G1), 2.37 × 10(9) s(−1) (G2), and 1.46 × 10(9) s(−1) (G3), which were in good agreement with those calculated using the Förster model. The phosphorescence enhancements were 157 (G1), 213 (G2), and 264% (G3) when compared to the phosphorescence of the core Ir(dfppy)2(pic-Ph2) (G0), in which pic-Ph2 is 3-(3,5-dibenzyloxybenzyl)picolinate.

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“…4 Cl, suggesting that more NH 4 Cl reduces the yield of Bi. It is well known that citric acid is a common reductant for the reduction of metal ions, such as Ag + , and Cu 2+ [34,[36][37][38]. But there is no report on the reduction of Bi 3+ to metallic Bi using citric acid, due to the smaller reduction potential of Bi 3+ + 3e -= Bi (s) (0.286 eV) than that of Ag + + e -= Ag (s) (0.8 eV) and Cu 2+ + 2e -= Cu (s) (0.339 eV).…”

Section: Photocatalytic Testmentioning

confidence: 99%