Composites of In/C hexagonal nanorods and graphene nanosheets for high-performance electromagnetic wave absorption

In recent years,electromagnetic wave(EMW)absorption has been extensively investigated for solving EMW radiation and pollution.The metal-organic frameworks(MOFs)have attracted attention due to their low density and unique structure,which can meet the requirements of strong reflection loss(RL)and wide absorption bandwidth of EMW absorption materials.In this manuscript,indium nanoparticles/porous carbon(In/C)nanorods composites were prepared via the pyrolysis of nanorods-like In-MOFs at a low temperature of450°C.Indium nanoparticles are evenly attached and embedded on porous carbon.Low electrical conductivity of In/C nanorods is unfavorable to EMW absorption performance,which is due to the low temperature carbonization.Thus,graphene(Gr)nanosheets with high electrical conductivity are introduced to adjust electromagnetic parameters of In/C nanorods for enhancing EMW absorption.The minimum RL of the In/C-Gr-4 composite is up to-43.7 dB with a thin thickness of 1.30 mm.In addition,when the thickness is further reduced to 1.14 mm,the minimum RL of-39.3 dB at 16.1 GHz and effective absorption bandwidth of 3.7 GHz(from 14.3 to 18.0 GHz)can be achieved.This work indicates that In/C-Gr composites show excellent EMW absorption performance.

Surface plasmon resonance-induced tunable polarization filters based on nanoscale gold film-coated photonic crystal fibers

Surface plasmon resonance induced tunable polarization filters based on nanoscale gold film-coated photonic crystal fibers were proposed and analyzed. The characteristics of the polarization filter were calculated by finite element method （FEM）. The gold film was selectively coated on the inner wall of one cladding air hole which was located near the fiber core along the y-axis direction. When the phase of core fundamental mode and surface plasmon polaritons （SPPs） mode matches, the two modes couple with each other intensely. Numerical results show that the resonance wavelength and strength vary with fiber structural parameters and the index of the infilling liquid. The fiber parameters were optimized to achieve specific functions. Under the optimal structure, we realized a dual channel filter at the communication wavelength of 1.31 μm and 1.55 μm fory polarization direction and x polarization direction. Then a single channel polarized filter at the communication wavelength of 1.55 μm is also achieved by adjusting the refractive index of the infilling liquid. The proposed polarization filters realized dual channel filtering and single channel filtering simultaneously under the same structure for the first time to the best of our knowledge.

多功能碳包覆的Ni@NiO纳米复合材料用于析氧反应、氧还原反应和锂离子电池电极的研究（英文）

本文成功合成了多功能的碳包覆Ni@NiO纳米复合材料,并将其用作析氧反应和氧还原反应催化剂以及锂离子电池的负极材料.扫描电镜和透射电镜照片表明Ni@NiO@C纳米复合物具有均一的球形核壳结构.将Ni@NiO@C纳米复合物用作氧还原反应的催化剂时,在浓度为0.1 mol L^(-1)的氢氧化钾溶液中以1600 rpm转速下连续反应15小时后,电流密度仍然可以保持在初始值的90%以上.作为析氧反应的催化剂时,在电流密度为10 mA cm^(-2)时Ni@NiO@C纳米复合物的活性电位是380 mV(vs.RHE).同时线性拟合的塔菲尔斜率为55 mV dec^(-1).Ni@NiO@C纳米复合物被用作锂离子电池的负极材料时,在电流密度为200mA g^(-1)下循环400圈后,电池容量还可以达到750mA hg^(-1).结果表明,Ni@NiO@C纳米复合物用于氧还原反应、析氧反应和锂离子电池均具有优异的电化学性能.

碳布上快速合成CoP纳米线阵列用于析氢和超级电容器（英文）

本文利用微波辅助水热法在碳布上快速合成了CoP纳米线阵列(CoP/CC)双功能电极材料,可用于析氢反应(HER)和超级电容器的电极.CoP/CC用于HER时展现了优越的电化学性能,其塔菲尔斜率为56 mV/dec.当电流密度为10 mA cm^(-2)时,其电位低至68 mV.值得注意的是,CoP/CC也可用于超级电容器的电极.在扫描速率为5 mV s^(-1)时,其比电容高达674 F g^(-1).同时具有高的循环稳定性,在循环10000次后,比电容仍然可以维持在初始值的86%.本文结果表明,CoP/CC可以作为HER和超级电容器电极的有力候选者.

Microwave Synthesized In2S3@CNTs with Excellent Properties in Lithium-Ion Battery and Electromagnetic Wave Absorption

The three-dimensional nanoflower-like β-In2S3 composited with carbon nanotubes {CNTs） has been synthesized by a single mode micro- wave-assisted hydrothermal technique. The In2S3 and CNTs nanocomposites （In2S3@CNTs） were investigated as the anode materials of lithium batteries （LIBs） and the electromagnetic wave absorption materials. For LIBs applications, the In2S3@CNTs nanocomposite exhibited excellent cycling stability with a high reversible charge capacity of 575 mA·h·g-1 after 300 cycles at 0.S A·g^-1, In addition, the In2S3@CNTs used as electromagnetic wave absorber displayed a maximum reflection loss of-42.75 dB at 11.96 GHz with a thickness of 1.55 ram.

Broadband light absorption and photoresponse enhancement in monolayer WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators

Monolayer(1L)transition metal dichalcogenides(TMDCs)have been attracting tremendous interest in recent years as promising candidate materials in atomic-scale optoelectronic devices due to their direct band gaps(1.5-2.2 eV)and strong light-matter interactions.Unfortunately,their practical applications are limited by low visible light absorption stemming from atomic thickness and negligible infrared response.Here,we report the triangular Sb_(2)O_(3) microresonators in wide thickness and lateral size distributions grown on 1L TMDCs and their created significant broadband enhancement of light adsorption and photoresponse in 1L WSe_(2) crystal via coexisting Fabry-Perot and whispering gallery type resonances.As an example of demonstration,1L WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators with widely distributed sizes exhibits the enhanced visible light absorption by up to 5 folds and the simultaneously extended near infrared(NIR)one of more than 50%.For application of 1L WSe_(2) in photodetection,incorporation of Sb2O3 microresonators leads to significantly enhanced visible light responsivity by~10^(4) order and expanded NIR one of more than 400 mA·W^(-1).Similar results have been observed in the other 1L W(Mo)dichalcogenides coupled to Sb2O3 microresonators.This work provides a new route for development of the high-performance monolayer TMDCs-based optoelectronic devices.