The stoichiometry of boron carbide thin films was controlled in the range of 0.1~8.9 and 3.04 ~ 5.92 via pulsed laser deposition by using SPSed- (Spark Plasma Sintered) and dual-targets, respectively. The amorphous films sized 50 nm in thickness. In the case of dual-target, the reaction rate of boron and carbon atoms increased with the increasing of target rotating speed. Uniform, layered and FGM (Functionally Graded Materials) B-C thin films can be obtained by controlling this reaction rate. Two kinds of structural evolutions have been found by investigation of bonding environments in as-deposited thin films via XPS (X-ray photoelectron spectroscopy) study. With decrease of B/C ratio, films deposited from SPSed-target show the B11C-CBB→B11C-CBC transformation. In contrast, the films deposited from dual-target present the B11CCBB→B10C2-CBB structural change. Also, the deposition mechanism of films by this novel dual-target has been discussed.

Boron carbide

Stoichiometry

Pulsed Laser Deposition

Deposition

Amorphous carbon

Carbon fibers

Source

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Photonic Spin-Multiplexing Metasurface for Switchable Spiral Phase Contrast Imaging

Nano Letters (2020)

Pengcheng Huo Cheng Zhang Wenqi Zhu Mingze Liu Song Zhang

As the two most representative operation modes in an optical imaging system, bright-field imaging and phase contrast imaging can extract different morphological information on an object. Developing a miniature and low-cost system capable of switching between these two imaging modes is thus very attractive for a number of applications, such as biomedical imaging. Here, we propose and demonstrate that a Fourier transform setup incorporating an all-dielectric metasurface can perform a two-dimensional spatial differentiation operation and thus achieve isotropic edge detection. In addition, the metasurface can provide two spin-dependent, uncorrelated phase profiles across the entire visible spectrum. Therefore, based on the spin-state of incident light, the system can be used for either diffraction-limited bright-field imaging or isotropic edge-enhanced phase contrast imaging. Combined with the advantages of planar architecture and ultrathin thickness of the metasurface, we envision this approach may open new vistas in the very interdisciplinary field of imaging and microscopy.

10.1021/acs.nanolett.0c00471

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Citations (260)

Fabrication of GaN Microporous Structure at a GaN/Sapphire Interface as the Template for Thick-Film GaN Separation Grown by HVPE

Journal of Electronic Materials (2016)

Jianli Chen Hongjuan Cheng Song Zhang Feifei Lan Chengjun Qi

Crystal (programming language)

10.1007/s11664-016-4726-8

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Citations (3)

Grain size and grain boundary characteristics on the out-plane thermal conductivity of <111>-oriented CVD 3C-SiC

Ceramics International (2024)

Wei Ding Pengjian Lu Qingfang Xu Chitengfei Zhang Rong Tu

10.1016/j.ceramint.2024.04.101

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Citations (5)

Laser-induced growth of large-area epitaxial graphene with low sheet resistance on 4H-SiC(0001)

Applied Surface Science (2020)

Zhizhuang Liu Qingfang Xu Chitengfei Zhang Qingyun Sun Chuanbin Wang

10.1016/j.apsusc.2020.145938

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Citations (16)

SERS effect of Rhodamine 6G molecular probe on AgAu alloy nanowire arrays by a solid-state ionics method

Physica E Low-dimensional Systems and Nanostructures (2018)

Dapeng Xu Hengze Jiang Wei Yang Song Zhang Jian Chen

Rhodamine 6G

10.1016/j.physe.2018.05.005

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Citations (16)

The investigation on the texture differences between p-type and n-type crystalline silicon wafers

Wenjuan Wu Jin Xu Xi Xi Liping Chen Feng Gao

Surface reflectivity is one of the important factors for solar cells. The anisotropic etching behavior of different types of monocrystalline silicon was studied in this paper. The etching rate is determined as a function of temperature, crystal orientation, and etchant composition. It is found that the etching rate of n-type silicon is faster than that of p-type silicon in the same corrosive solution. The reason is analyzed in this paper. For p-type silicon wafers, well-proportioned texturization was obtained in 2.0% NaOH(in mass, the same below) and 10% IPA aqueous solution at 80□ with 25 min, while for n-type wafers, the process time should be reduced to 20 min. The texturization was better when adding 3% Na 2 SiO 3 in the solution, and the lowest reflectivity could be 9.5%.

Texture (cosmology)

10.1109/pvsc.2012.6318053

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Multiresonance of energy transport and absence of heat pump in a force-driven lattice

Physical Review E (2011)

Song Zhang Jie Ren Baowen Li

Energy transport control in low dimensional nanoscale systems has attracted much attention in recent years. In this paper, we investigate the energy transport properties of the Frenkel-Kontorova lattice subject to a periodic driving force, in particular, the resonance behavior of the energy current by varying the external driving frequency. It is discovered that, in certain parameter ranges, multiple resonance peaks, instead of a single resonance, emerge. By comparing the nonlinear lattice model with a harmonic chain, we unravel the underlying physical mechanism for such a resonance phenomenon. Other parameter dependencies of the resonance behavior are examined as well. Finally, we demonstrate that heat pumping is actually absent in this force-driven model.

Lattice (music)

Energy transport

10.1103/physreve.84.031122

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Effects of nitrogen gas ratio on magnetron sputtering deposited boron nitride films

Vacuum (2014)

Chuanbin Wang Xiaoshuang Luo Song Zhang Qiang Shen Lianmeng Zhang

Nitrogen gas

Cavity magnetron

10.1016/j.vacuum.2013.12.009

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Citations (22)