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  • AIP Publishing  (75)
  • 1
    Online Resource
    Online Resource
    Ultrafast electron transfer in all-small-molecule photovoltaic blends promoted by intermolecular interactions in cyanided donors
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 6 ( 2021-12-01), p. 751-760
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 6 ( 2021-12-01), p. 751-760
    Abstract: Cyano substitution has been established as a viable approach to optimize the performance of all-small-molecule organic solar cells. However, the effect of cyano substitution on the dynamics of photo-charge generation remains largely unexplored. Here, we report an ultrafast spectroscopic study showing that electron transfer is markedly promoted by enhanced intermolecular charge-transfer interaction in all-small-molecule blends with cyanided donors. The delocalized excitations, arising from intermolecular interaction in the moiety of cyano-substituted donor, undergo ultrafast electron transfer with a lifetime of ~3 ps in the blend. In contrast, some locally excited states, surviving in the film of donor without cyano substitution, are not actively involved in the charge separation. These findings well explain the performance improvement of devices with cyanided donors, suggesting that manipulating intermolecular interaction is an efficient strategy for device optimization.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2109179
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 2
    Online Resource
    Online Resource
    Convenient Approach to -Fe2O3 Nanoparticles: Magnetic and Electrochemical Properties
    AIP Publishing ; 2007
    In:  Chinese Journal of Chemical Physics Vol. 20, No. 2 ( 2007-04-01), p. 203-206
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 20, No. 2 ( 2007-04-01), p. 203-206
    Abstract: A convenient approach is reported for the synthesis of spherical maghemite (-Fe2O3) nanoparticles. The process was realized by the controlled oxidation of Fe3O4 precursor, which originated from a facile partial-reduction co-precipitation process. The starting material of hydrosulfurous sodium (Na2S2O4), which can allow reaction to proceed without any deoxygenated protection, was proven to be important in the formation of the precursor. A series of techniques, including X-ray diffraction, transmission electron microscopy and a vibrating sample magnetometer were used to characterize the product. The resultant -Fe2O3 nanoparticles exhibited ferromagnetism at 300 K and the values of saturation magnetization and coercivity were 70 emu/g and 164 Oe, respectively. The electrochemical properties of lithium ions intercalation into -Fe2O3 nanoparticles were tested in Teflon cells. A specific capacity of 933 mAh/g was delivered at a current density of 0.2 mA/cm2 (voltage range 3.0-0.3 V vs. Li), corresponding to the reaction of 5.7 Li+ per Fe2O3. A possible mechanism of the reaction of lithium with maghemite spinel was discussed.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1360/cjcp2007.20(2).203.4
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 3
    Online Resource
    Online Resource
    Catalytic pyrolysis of biodiesel surrogate over HZSM-5 zeolite catalyst
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 1 ( 2021-02-01), p. 102-111
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 1 ( 2021-02-01), p. 102-111
    Abstract: To obtain insight into the catalytic reaction mechanism of biodiesels over ZSM-5 zeolites, the pyrolysis and catalytic pyrolysis of methyl butanoate, a biodiesel surrogate, with H-type ZSM-5 (HZSM-5) were performed in a flow re-actor under atmospheric pressure. The pyrolysis products were identified and quantified using gas chromatography-mass spectrometry (GC-MS). Kinetic modelling and experimental results revealed that H-atom abstraction in the gas phase was the primary pathway for methyl butanoate decomposition during pyrolysis, but dissociating to ketene and methanol over HZSM-5 was the primary pathway for methyl butanoate consumption during catalytic pyrolysis. The initial decomposition temperature of methyl butanoate was reduced by approximately 300 K over HZSM-5 compared to that for the uncatalyzed reaction. In addition, the apparent activation energies of methyl butanoate under catalytic pyrolysis and homogeneous pyrolysis conditions were obtained using the Arrhenius equation. The significantly reduced apparent activation energy confirmed the catalytic performance of HZSM-5 for methyl butanoate pyrolysis. The activation temperature may also affect some catalytic properties of HZSM-5. Overall, this study can be used to guide subsequent catalytic combustion for practical biodiesel fuels.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2004043
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 4
    Online Resource
    Online Resource
    Enhancement of momentum coupling coefficient by cavity with toroidal bubble for underwater laser propulsion
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 113, No. 6 ( 2013-02-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 113, No. 6 ( 2013-02-14)
    Abstract: High-speed photography method is employed to study underwater laser propulsion using targets with and without cavity as well as the effect of the cavity depth. The shapes and motions of bubbles generated from the target tail by Nd: YAG laser are recorded by high-speed camera. Then, the influence of different bubble shapes on the laser propulsion is analyzed. Besides, the velocity and momentum coupling coefficient of the targets are investigated. The results show that the bubble is hemispherical in the case of target without cavity, while it is toroidal in the case of target with cavity. Experiments verify that compared with hemispherical bubble, the toroidal bubble is more conducive to laser propulsion in water, which means the target with cavity obtains more momentum than the target without cavity. In addition, the momentum coupling coefficient increases with laser energy first, and then it levels out and decreases a bit for the target with cavity. There is little effect of the cavity depth on propulsion.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4792041
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Modeling Verwey transition temperature of Fe3O4 nanocrystals
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 20 ( 2016-11-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 20 ( 2016-11-14)
    Abstract: The Verwey transition in nanoscale is an important physical property for Fe3O4 nanocrystals and has attracted extensive attention in recent years. In this work, an analytic thermodynamic model without any adjusting parameters is developed to estimate the size and shape effects on modulating the Verwey transition temperature of Fe3O4 nanocrystals. The results show that the Verwey transition temperature reduces with increasing shape parameter λ or decreasing size D. A good agreement between the prediction and the experimental data verified our physical insight that the Verwey transition of Fe3O4 can be directly related to the atomic thermal vibration. The results presented in this work will be of benefit to the understanding of the microscopic mechanism of the Verwey transition and the design of future generation switching and memory devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4962139
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
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    Online Resource
    Atomically dispersed cobalt anchored on N-doped graphene aerogels for efficient electromagnetic wave absorption with an ultralow filler ratio
    AIP Publishing ; 2022
    In:  Applied Physics Reviews Vol. 9, No. 1 ( 2022-03-01)
    Details
    In: Applied Physics Reviews, AIP Publishing, Vol. 9, No. 1 ( 2022-03-01)
    Abstract: The widespread application of high-frequency electronic and communication devices has caused increasingly severe electromagnetic pollution. It is highly desirable but challenging to develop ultralight electromagnetic wave (EMW) absorbers with strong absorption performance to eliminate the negative effects of electromagnetic pollution. Herein, a secondary ion adsorption and defect-anchoring strategy was proposed to construct ultralight N-doped graphene aerogels containing isolated single cobalt atoms (Co-SAs/GAs) with a tunable content of Co-SAs from 1.13 to 2.58 wt. %. The optimal Co-SAs/GAs with a matching thickness of 1.5 mm and an ultralow filler ratio of 5 wt. % attenuated about 99.999% electromagnetic energy and exhibited specific EMW absorption performance (SMAP) of 37 220 dB cm2 g−1, which was 15 000 dB cm2 g−1 higher than that of the best reported absorber in literature. Permittivity and electrical conductivity measurements indicated that the introduction of Co-SAs significantly increased the conduction and polarization losses of the GAs, which was confirmed by simulation results based on the Havriliak–Negami equation. Theoretical calculations demonstrated that the Co–N4 moiety exhibited obvious polarization behavior, which could be further tuned by defective sites in its vicinity. This comprehensive investigation of the relationships between single-atom structure and electromagnetic wave absorption property provides an efficient route toward the rational design of ultralight absorbers with metal single-atoms.
    Type of Medium: Online Resource
    ISSN: 1931-9401
    URL: Article
    DOI: 10.1063/5.0067791
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2265524-4
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  • 7
    Online Resource
    Online Resource
    Role of point defects in room-temperature ferromagnetism of Cr-doped ZnO
    AIP Publishing ; 2007
    In:  Applied Physics Letters Vol. 91, No. 7 ( 2007-08-13), p. 072511-
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 91, No. 7 ( 2007-08-13), p. 072511-
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2772176
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Thermally induced generation and annihilation of magnetic chiral skyrmion bubbles and achiral bubbles in Mn–Ni–Ga magnets
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 116, No. 13 ( 2020-03-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 116, No. 13 ( 2020-03-30)
    Abstract: Magnetic chiral skyrmion bubbles and achiral bubbles are two independent magnetic domain structures, in which the former with an equivalent winding number to skyrmions offer great promise as information carriers for further spintronic devices. Here, in this work, we experimentally investigate the generation and annihilation of magnetic chiral skyrmion bubbles and achiral bubbles in the Mn–Ni–Ga thin plate by using Lorentz transmission electron microscopy (L-TEM). The two independent magnetic domain structures can be directly controlled after field cooling manipulation by varying the titled angles of external magnetic fields. By imaging the magnetization reversal with increasing temperature, we found an extraordinary annihilation mode of magnetic chiral skyrmion bubbles and a non-linear frequency for the winding number reversal. The quantitative analysis of such dynamics was performed by using L-TEM to directly determine the barrier energy for the magnetization reversal of magnetic chiral skyrmion bubbles.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5142083
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Chemical synthesis and magnetic properties of dilute magnetic ZnTe:Cr crystals
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 9 ( 2006-08-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 9 ( 2006-08-28)
    Abstract: ZnTe and Cr doped ZnTe crystals have been synthesized using a solvothermal process. The characterizations by x-ray diffraction and transmission electron microscopy show that the synthesized ZnTe:Cr crystals have a cubic structure and Cr is incorporated into ZnTe. The magnetic properties of ZnTe:Cr are investigated. A hysteresis is observed in the magnetization versus magnetic field measurements below 10K. The detailed analyses suggest that the hysteresis possibly originated from the magnetic short-range ordering of Zn1−xCrxTe compounds in the sample.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2337561
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Enhancement of photovoltaic efficiency of phosphor doped organic solar cell by energy and electron transfer from the phosphor to C60 acceptor
    AIP Publishing ; 2011
    In:  Applied Physics Letters Vol. 99, No. 19 ( 2011-11-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 99, No. 19 ( 2011-11-07)
    Abstract: About 67% increase in power conversion efficiency (PCE) of copper phthalocyanine/C60 based organic solar cells was demonstrated by doping 4 wt % iridium(III)bis(3-(2-benzothiazolyl)-7-(diethylamino)-2H-1-benzopyran-2-onato-N’,C4)(acetyl acetonate) (IrC6) into C60 acceptor layer. The raised PCE was proved to result from the efficient photo absorption of IrC6 followed by the energy and electron transfer from IrC6 to C60 due to the matched energy level alignment between these two species. Besides, IrC6 could also increase the exciton dissociation efficiency at the active interface of the solar cells. The more detail improvement mechanisms were also discussed.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3658875
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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