JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 14
·11646-11653
·
IF 2.22
Shi Kai,Su Junhong,Hu Kai,Liang Haifeng
A wide-spectrum high-transmittance copper mesh was designed and fabricated for effective shielding of electromagnetic waves. Using mask lithography and chemical etching, the copper mesh can be easily fabricated. The thickness of the copper mesh is uniform, whether at the crossing section and the copper wire. The average transmittance of the copper mesh from ultraviolet band to near-infrared band (200–2500 nm) is 96%, in agreement with the designed results. The electromagnetic interference shielding efficiency (EMI SE) is to 16 dB in Ku-band. The result of X-ray photoelectron spectroscopy analysis shows that a large amount of Cu 2+ on the surface is reduced to Cu 0 and Cu + after annealing. As result, the EMI SE value of copper mesh has increased by 1.5 dB in Ku-band. We envision that the copper mesh can provide a good solution for optically transparent electromagnetic interference shielding.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 3
·1640-1647
·
IF 3.784
Bin Han,Qianhang Luo,Pengyu Zhang,Ting Zhang,Guowu Tang,Zhe Chen,Hang Zhang,Baoan Zhong,Yunhao Zeng,Min Sun,Qi Qian,Zhongmin Yang
In the field of multimaterial optical fibers, the demand for high-performance single-crystal core glass-clad multimaterial optical fibers is increasing. However, the applications of single-crystal fibers are restricted by the complex fabrication processes and the slow growth of single-crystal materials. Here, a two-step method is demonstrated to achieve single-crystal tellurium (Te) core fibers with high crystal quality over the length of the fiber. This method starts with the thermal drawing of a fiber preform into polycrystalline Te core multimaterial fibers (precursor fibers) that are long and mechanically stable. A 532-nm continuous laser is then employed to recrystallize the Te core in the precursor fiber into a single crystal state along the entire length of the fiber. Experimental studies of these single-crystal fibers demonstrate that the single-crystal Te core fibers possess high transmittance (>90% at 2–10 μm) and high thermoelectric performance (ZT values from 0.03 to 0.13 at 300 K temperature). They are superior to previous reports and our previous work. This method works for fabricating various single-crystal fibers and has important applications in the field of optical fibers, functional fibers, and their integrated devices.
研究领域:
光学
·
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 36
·1801127
·
IF 13.325
Hanchuan Tang,Zhesi Chen,Ni Tang,Shuaifeng Li,Yaxi Shen,Yugui Peng,Xuefeng Zhu,Jianfeng Zang
Acoustic metasurfaces that can manipulate and control sound waves at 2D subwavelength scales open new avenues to unusual applications, such as asymmetric transmission, super-resolution imaging, and particle manipulation. However, the long-standing goals of pushing frontier metamaterials research into real practice are still severely constrained by cumbersome configuration, large acoustic loss, and rigid structure of the existing metamaterials. An ultrathin metasurface (10–300 µm in thickness, up to ≈λ/650, λ the wavelength) that is capable of imparting sound wave with a nontrivial phase shift with high transmittance (>80%) in the range of 5–30 kHz is fabricated here. The metasurface is comprised of a porous network of soft polymer fiber/rigid beads that are physically equivalent to crosslinked spring-mass resonators. Moreover, the traditional paper-cutting art to carve the ultrathin metasurface into hollow-out patterns is incorporated, resulting in a variety of remarkable functions, including acoustic vortex, focusing, and super-resolution. The hollow-out patterning approach innovates the traditional one-step metadevice fabrication process into two separated steps: 1) fabrication of ultrathin metasurfaces; 2) hollow-out patterning of metasurfaces. The strategy opens an avenue to mass production of acoustic metadevices, shedding light on the applications of the metamaterials in acoustic cloaking, acoustic positioning, and particle manipulation.
研究领域:
材料科学
·
声学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 2
·360-366
·
IF 2.606
Chen Jinglei,Xie Guangmin,Chen Pengfei,Shi Zhiming,Ma Jiachen,Zhang Xiurong,Zhang Xihui,Wang Yige
Transparent materials with a low refraction index are used to eliminate an important energy loss in photovoltaic conversion which is caused by the Frensenl reflection at the air-substrate interface of a solar cell. Herein, we prepared the silica antireflection coating (AR) with low index by an acid-base-catalyzed sol-gel approach. The application of the AR coating can efficiently reduce the light reflection and which exhibits a maximum transmittance of T max = 99.4% at visible wavelengths from 380 nm to 800 nm. When the AR coating was applied to the silicon modules, leading to a significant efficiency enhancement from 16.18% to 16.83%. In addition, the AR coatings feature good adhesion and exhibit satisfactory mechanical stability under outdoor conditions. These results indicate a significant development for AR coatings applied in silicon modules as well as present a promising alternative to reduce the cost of energy.
The AR film prepared in this paper has both high transmittance and abrasion resistance. The current density of solar modules has been significantly improved, and the photoelectric conversion efficiency has increased by 4%.
研究领域:
材料科学
·
光伏技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Lei Bao,Zihan Ji,Hongning Wang,Ruoyu Chen
Antireflective coatings with superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength have important practical value. In this research, hollow nanorod-like MgF2 sols with different void volumes were prepared by a template-free solvothermal method to further obtain hollow nanorod-like MgF2 crystals with an ultralow refractive index of 1.14. Besides, a MgF2 coating with an adjustable refractive index of 1.10–1.35 was also prepared by the template-free solvothermal method. Then through the combination of base/acid two-step-catalyzed TEOS and hydroxyl modification on the surface of nanosilica spheres, the SiO2 coating with good mechanical strength, a flat surface, and a refractive index of 1.30–1.45 was obtained. Double-layer broadband antireflective coatings with an average transmittance of 99.6% at 400–1400 nm were designed using the relevant optical theory. After the coating thickness was optimized by the dip-coating method, the double-layer antireflective coatings, whose parameters were consistent with those designed by the theory, were obtained. The bottom layer was a SiO2 coating with a refractive index of 1.34 and a thickness of 155 nm, and the top layer was a hollow rodlike MgF2 coating with a refractive index of 1.10 and a thickness of 165 nm. The average transmittance of the obtained MgF2–SiO2 antireflective coatings was 99.1% at 400–1400 nm, which was close to the theoretical value. The hydrophobic angle of the coating surface reached 119° at first, and the angle further reached 152° after conducting surface modification by PFOTES. In addition, because the porosity of the coating surface was only 10.7%, the pencil hardness of the coating surface was 5 H and the critical load Lc was 27.05 N. In summary, the obtained antireflective coatings possessed superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Shuangquan Liu,Chen Weifeng,Yulong Qiao,Tao Li,Xu Li,Ting Xiao,Lihua Jiang,Xinyu Tan
Preparation of anti-reflective (AR) films with both high transmittance and self-cleaning function is crucial for the photovoltaic or other optical devices. Herein, the modified SO 2 AR film is fabricated through facile synthesis. For the synthesis of silica sol, the aging process is eliminated completely, thus greatly shortening the preparation time from days or weeks to hours. The obtained film possesses excellent transmittance, as high as 99.4% at 580 nm, increased by 8.5% for comparison with the original bare glass. After hydrophobic treatment, the water contact angle (WCA) of the film can achieve to about 140°, exhibiting the nice self-cleaning function. It is demonstrated that the hydrophobic modified film has outstanding thermal stability, chemical stability, and mechanical stability. This work contributes well to the synthesis of AR films with ultrahigh transmittance and excellent self-cleaning function, exhibiting the great significance in the development of AR films.
研究领域:
材料科学
·
光学
·
纳米技术
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 38
·13732-13736
·
IF 4
Ziyan Lv,Rukang Li
Much effort has been devoted to synthesizing nonlinear optical crystals with efficient second harmonic responses. Herein, a tantalum phosphate crystal Na11Ta8P7O43 with a moderate second harmonic response was obtained using self-fluxes of NaH2PO4 and Na2HPO4. Na11Ta8P7O43 belongs to the Cc space group of monoclinic systems with cell parameters of a = 8.5710(2) Å, b = 15.1144(4) Å, c = 28.7712(7) Å, β = 92.304(2)°, Z = 4. Its structural features were unique (Ta8O33) bi-capped triangular prisms uniformly oriented with a PO4 connection in the ab plane, which were further joined through additional PO4 groups in the c direction, resulting in moderate nonlinear effects. In addition, this crystal has the characteristics of phase-matchable second harmonic generation, a shorter cutoff edge than the known materials LiTaO3 and KTiOPO4, and high transmittance from the visible to the near infrared band, and may serve as a potential nonlinear optical crystal.
研究领域:
材料科学
·
非线性光学
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）