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  • AIP Publishing  (114)
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  • AIP Publishing  (114)
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  • 1
    Online Resource
    Online Resource
    Wide-band microwave absorption by in situ tailoring morphology and optimized N-doping in nano-SiC
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 22 ( 2017-11-27)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 22 ( 2017-11-27)
    Abstract: SiC has amazing electromagnetic wave absorption properties based on its excellent dielectric properties. The optimized N-doping nano-SiC with in-situ tailored morphology by a facile one-step synthesis strategy is presented. By using a new N source and gas catalyst, acetonitrile (C2H3N) was exploited to synthesize N-doped nano-SiC with an evolution of morphology from spherical to nanoflake. The surface area of the nanoflake SiC is significantly expanded to support more quantity and types of electric dipoles. Combining the optimized N concentration doping, the complex dielectric and microwave absorption properties of the tailored nano-SiC are clearly improved in the 2–18 GHz range when compared to previously reported SiC and N-doped SiC nanoparticles. The higher ε″ and tan δ values are attributed to fortified polarization relaxation by optimized N-doping and novel nanoflake morphology. A wideband reflection loss exceeding –10 dB (90% microwave absorption) reached 4.1 GHz with an absorber thickness of 1.58 mm. A minimum value of −42 dB at 8 GHz was also achieved. The mechanism of dielectric loss of nanoflake N-doped SiC is discussed in detail.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5003983
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Experimental investigations of hard x-ray source produced by picosecond laser-irradiated solid target
    AIP Publishing ; 2022
    In:  Physics of Plasmas Vol. 29, No. 1 ( 2022-01-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 29, No. 1 ( 2022-01-01)
    Abstract: Measurements of Kα line and bremsstrahlung continuous x-ray emission from high-intensity laser-irradiated thin targets are presented. The experiments were performed at the SG-II UP Petawatt laser. Self-standing Sn foils varying thicknesses and Sn foils backed by the thick substrate were irradiated by the laser pulses up to 300 J of energy with peak intensity higher than 1018 W/cm2. A transmission curved crystal spectrometer and a filter-stack spectrometer were used to measure the Kα line and bremsstrahlung x-ray spectral distribution, respectively. Both Kα and 70–200 keV x-ray yields decrease 3- to 5-fold for target backed by the substrate. 2- to 4-fold reduction of Kα and 70–200 keV x-ray yields for the 8.5 μm targets relative to 50 μm targets was observed. Moreover, a significant background x-ray emission generated from the target holder reduces the ratio of signal to noise. Adopting a low-Z material holder can mitigate the x-ray background noises. This study is instructive to optimize target design for the high-intensity laser-driven Kα or continuous x-ray sources.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0064541
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472746-8
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  • 3
    Online Resource
    Online Resource
    Flux-creep activation energy for a BaFe1.9Ni0.1As2 single crystal derived from alternating current susceptibility measurements
    AIP Publishing ; 2016
    In:  Journal of Applied Physics Vol. 119, No. 16 ( 2016-04-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 119, No. 16 ( 2016-04-28)
    Abstract: Systematic ac susceptibility measurements have been performed to investigate the vortex dynamics in a BaFe1.9Ni0.1As2 single crystal as a function of temperature, frequency, ac field amplitude, and dc magnetic field. The complex activation energy U(T,B,j) is derived in the framework of thermally activated flux creep theory and can be expressed in one simple formula. A power law dependence of U∼Bα with α = −0.46 is observed. The activation energy reaches 104 K at low fields, suggesting strong pinning in the material. The nonlinear function of the activation energy vs. the current density is determined, which has the expression of U∝j−0.1.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4948356
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Direct observation of blocked nanoscale surface evaporation on SiO2 nanodroplets
    AIP Publishing ; 2012
    In:  Applied Physics Letters Vol. 101, No. 18 ( 2012-10-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 101, No. 18 ( 2012-10-29)
    Abstract: Nano-scale surface evaporation of SiO2 nanodroplets from a volcano-shaped tip (tip diameter d ∼ 20 nm to 70 nm) was observed directly using an in situ transmission electron microscopy method. Au nanoparticles, those precipitated in the SiO2 matrix after an Au catalyzed growth, diffused and pinned onto the evaporation surface, which induced blocked evaporation dynamics. Our observations provide direct evidences of blocked evaporation dynamics caused by small-sized nanoparticles at the nanometer scale.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1063/1.4765662
    DOI: 10.1063/1.4765662.1
    DOI: 10.1063/1.4765662.2
    DOI: 10.1063/1.4765662.3
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Study of surface-enhanced Raman scattering activity of DNA-directed self-assembled gold nanoparticle dimers
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 107, No. 19 ( 2015-11-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 107, No. 19 ( 2015-11-09)
    Abstract: Quantitative research on the localized surface plasmon resonance of metallic nanostructures has received tremendous interest. However, most current studies have concentrated on theoretical calculation because it is difficult to obtain monodisperse metallic nanostructures with high purity experimentally. In this work, gold nanodimers (GNDs) with high uniformity are fabricated through DNA-directed self-assembly of gold nanoparticles and then used as substrates for surface-enhanced Raman scattering (SERS). The dependence of the SERS properties of the substrates on the size of the gold particles and the position of Rhodamine B (RB) molecules is systematically studied using the DNA-directed self-assembled GNDs with Raman-active RB molecules immobilized in different positions between pairs of gold nanoparticles as a model system. Theoretical simulations conducted using the finite difference time domain (FDTD) method confirm the structure-dependent SERS characteristics of the GNDs, with good agreement between the FDTD simulation data and experimental results.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4935543
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Broadband acoustic converging and asymmetric converging based on thermoacoustic phased arrays
    AIP Publishing ; 2019
    In:  Journal of Applied Physics Vol. 125, No. 2 ( 2019-01-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 125, No. 2 ( 2019-01-14)
    Abstract: We report broadband acoustic converging and asymmetric converging based on mono- and dual-layer thermoacoustic phased arrays of Bessel-like beams, respectively. Based on the thermoacoustic units, we design a converging lens constructed by a monolayer phased array of the Bessel-like beam and demonstrate the large converging region (16.8λ), the broad fractional bandwidth (0.77), and the design feasibility of the converging lens. Besides, by adjusting the phase distribution of the converging lens, the cylindrical acoustic source can also be converged on a large region perfectly. More importantly, we design an asymmetric converging lens by introducing dual-layer phased arrays, in which the acoustic energy can be converged on a large region at a side but cannot pass through the lens at the other side. The converging region can be manipulated by adjusting the distance between two phased arrays. The proposed lenses have the advantages of large converging region, broad bandwidth, weak diffraction, and asymmetric transmission showing excellent potential applications in acoustic devices.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5055288
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    High-resolution Infrared Spectroscopy of 15N216O in 1650–3450 cm−1
    AIP Publishing ; 2011
    In:  Chinese Journal of Chemical Physics Vol. 24, No. 5 ( 2011-10-01), p. 611-619
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 24, No. 5 ( 2011-10-01), p. 611-619
    Abstract: High-resolution ro-vibrational spectroscopy of 15N216O in 1650–3450 cm−1 region is studied using highly enriched isotopologue sample. The positions of more than 7300 lines of 15N216O isotopologue were measured with a typical accuracy of 5.0×10−4 cm−1. The transitions were rovibrationally assigned on the basis of the global effective Hamiltonian model. The band by band analysis allowed for the determination of the rovibrational parameters of a total of 73 bands. 29 of them are newly reported and more rotational transitions have been observed for the others. The maximum deviation of the preidictions of the effective Hamiltonian model is up to 0.70 cm−1 for the 15N216O species.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/24/05/611-619
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 8
    Online Resource
    Online Resource
    Effect of protein dimerization on ion conductivity of gramicidin a channel studied using polarizable force field
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 4 ( 2021-08-01), p. 471-479
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 4 ( 2021-08-01), p. 471-479
    Abstract: In studies of ion channel systems, due to the huge computational cost of polarizable force fields, classical force fields remain the most widely used for a long time. In this work, we used the AMOEBA polarizable atomic multipole force field in enhanced sampling simulations of single-channel gramicidin A (gA) and double-channel gA systems and investigated its reliability in characterizing ion-transport properties of the gA ion channel under dimerization. The influence of gA dimerization on the permeation of potassium and sodium ions through the channel was described in terms of conductance, diffusion coefficient, and free energy profile. Results from the polarizable force field simulations show that the conductance of potassium and sodium ions passing through the single- and double-channel agrees well with experimental values. Further data analysis reveals that the molecular mechanism of protein dimerization affects the ion-transport properties of gA channels, i.e., protein dimerization accelerates the permeation of potassium and sodium ions passing through the double-channel by adjusting the environment around gA protein (the distribution of phospholipid head groups, ions outside the channel, and bulk water), rather than directly adjusting the conformation of gA protein.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2103046
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 9
    Online Resource
    Online Resource
    Ultrafast dynamics of defect-assisted carrier capture in MoS2 nanodots investigated by transient absorption spectroscopy
    AIP Publishing ; 2018
    In:  Chinese Journal of Chemical Physics Vol. 31, No. 3 ( 2018-06-01), p. 277-283
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 31, No. 3 ( 2018-06-01), p. 277-283
    Abstract: MoS2 nanodots are emerging as promising semiconductor materials for optoelectronic devices. However, most of the recent attention is focused on the fabrication of MoS2 nanodots, and the survey for exciton dynamics of MoS2 nanodots remains less explored. Herein, we use femtosecond transient absorption spectroscopy to investigate the carrier dynamics of MoS2nanodots. Our results show that defect-assisted carrier recombination processes are well consistent with the observed dynamics. The photo-excited carriers are captured by defects with at least two different capture rates via Auger scattering. Four processes are deemed to take part in the carrier relaxation. After photoexcitation, carrier cooling occurs instantly within ~0.5 ps. Then most of carriers are fast captured by the defects, and the corresponding time constant increases from ~4.9 ps to ~9.2 ps with increasing pump fluence, which may be interpreted by saturation of the defect states. Next a small quantity of carriers is captured by the other kinds of defects with a relatively slow carrier capture time within ~65 ps. Finally, the remaining small fraction of carriers relaxes via direct interband electron-hole recombination within ~1 ns. Our results may lead to deep insight into the fundamentals of carrier dynamics in MoS2 nanodots, paving the way for their further applications.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/31/cjcp1802018
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 10
    Online Resource
    Online Resource
    Photodissociation dynamics of CS2 near 204 nm: The S(3P J )+CS( X 1Σ+) channels
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Abstract: We study the photodissociation dynamics of CS2 in the ultraviolet region using the time-sliced velocity map ion imaging technique. The S(3PJ)+CS(X1Σ+) product channels were observed and identified at four wavelengths of 201.36, 203.10, 204.85 and 206.61 nm. In the measured images of S(3PJ=2,1,0), the vibrational states of the CS(X1Σ+) co-products were partially resolved and the vibrational state distributions were determined. Moreover, the product total kinetic energy releases and the anisotropic parameters were derived. The relatively small anisotropic parameter values indicate that the S(3PJ=2,1,0)+CS(X1Σ+) channels are very likely formed via the indirect predissociation process of CS2. The study of the S(3PJ=2,1,0)+CS(X1Σ+) channels, which come from the spin-orbit coupling dissociation process of CS2, shows that nonadiabatic process plays a role in the ultraviolet photodissociation of CS2.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2010183
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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