α-Ni(OH)2 was synthesized from a NiCl2 solution by electrodeposition method.In order to conduct a systematic study on the effects of experimental parameters,a series of electrolyte initial pH values,current densities...α-Ni(OH)2 was synthesized from a NiCl2 solution by electrodeposition method.In order to conduct a systematic study on the effects of experimental parameters,a series of electrolyte initial pH values,current densities,electrodeposition temperatures,and electrodeposition time were used.Cyclic voltammetry results demonstrated a side reaction of Ni^2++2e→Ni.The X-ray diffraction analysis,Fourier-transform infrared spectrum,and the color of the product showed that pureα-Ni(OH)2 could be obtained in the initial pH value range of 2−5.86,current density range of 10−25 mA/cm^2,electrodeposition temperature range of 25−35℃,and electrodeposition time range of 1.0−3.0 h.When electrodeposition temperature increased to 45℃,a mixture ofα-Ni(OH)2 and metallic Ni was obtained.A current density higher than 30 mA/cm^2 resulted in the sample with features ofβ-Ni(OH)2.A small amount of metallic Ni existed in the as-prepared sample when current density decreased to 5 mA/cm^2.A slight increase of electrolyte pH was observed with increasing initial solution pH and current density.Electrodeposition mass revealed a slight decrease with initial pH decreasing and showed an almost linear increase with current density increasing.The slope of the curve for electrodeposition mass versus electrodeposition time remained stable in the first 2.0 h and then decreased.展开更多
Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,inclu...Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.展开更多
基金Project(U1710257)supported by the National Natural Science Foundation of China。
文摘α-Ni(OH)2 was synthesized from a NiCl2 solution by electrodeposition method.In order to conduct a systematic study on the effects of experimental parameters,a series of electrolyte initial pH values,current densities,electrodeposition temperatures,and electrodeposition time were used.Cyclic voltammetry results demonstrated a side reaction of Ni^2++2e→Ni.The X-ray diffraction analysis,Fourier-transform infrared spectrum,and the color of the product showed that pureα-Ni(OH)2 could be obtained in the initial pH value range of 2−5.86,current density range of 10−25 mA/cm^2,electrodeposition temperature range of 25−35℃,and electrodeposition time range of 1.0−3.0 h.When electrodeposition temperature increased to 45℃,a mixture ofα-Ni(OH)2 and metallic Ni was obtained.A current density higher than 30 mA/cm^2 resulted in the sample with features ofβ-Ni(OH)2.A small amount of metallic Ni existed in the as-prepared sample when current density decreased to 5 mA/cm^2.A slight increase of electrolyte pH was observed with increasing initial solution pH and current density.Electrodeposition mass revealed a slight decrease with initial pH decreasing and showed an almost linear increase with current density increasing.The slope of the curve for electrodeposition mass versus electrodeposition time remained stable in the first 2.0 h and then decreased.
基金National Key Research and Development Program of China(2024YFE107800)National Natural Science Foundation of China(62205127)+1 种基金Basic Research Program of Jiangsu(BK20231493)Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province(KJS2272)。
文摘Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.
