The advent of“intelligent era”brings our life more convenience,but the electromagnetic radiation sur-rounding us not only greatly threatens human health,also makes information leakage and hidden trouble to national ...The advent of“intelligent era”brings our life more convenience,but the electromagnetic radiation sur-rounding us not only greatly threatens human health,also makes information leakage and hidden trouble to national defense security.Hence,it is very urgent to develop novel electromagnetic wave absorption materials with lightweight,strong absorption,tunable absorption frequency and broad band absorption.Herein,a novel electromagnetic wave absorber is obtained by constructing La_(0.8)CoO_(3)-rGO nanocompos-ite,where La_(0.8)CoO_(3)nanoparticles are anchored on graphene nanosheets by the electrostatic interaction between GO and La_(0.8)CoO_(3).The effect of hybridization ratio of La_(0.8)CoO_(3)and rGO on microwave ab-sorption properties is carefully studied.The optimal reflection loss of La_(0.8)CoO_(3)-rGO nanocomposite can reach-62.34 dB with the maximum effective bandwidth of 6.08 GHz,presenting 48.78%and 245.45%increment compared to bare La_(0.8)CoO_(3)nanoparticles,respectively.The effective absorption bandwidth covers a broad electromagnetic wave absorption band from Ku band to the C band by tailoring thickness of the absorbers from 2.4 mm to 4.4 mm.The fascinating electromagnetic wave absorption performance is attributed to the synergy effect of La_(0.8)CoO_(3)and rGO,which integrates magnetic and dielectric loss caused by resonance,conductance,relaxation,and scattering loss.This result confirms that La_(0.8)CoO_(3)-rGO nanocomposite is potential candidates toward high-efficiency microwave absorbers and provides a valuable pathway for designing high-performance microwave attenuation materials in the future.展开更多
The intelligent era brings electronics closer to humans,but also produces a large scale of electromag-netic(EM)radiation simultaneously,which causes serious harm to health and high sophisticated equip-ment.Exploring t...The intelligent era brings electronics closer to humans,but also produces a large scale of electromag-netic(EM)radiation simultaneously,which causes serious harm to health and high sophisticated equip-ment.Exploring the underlying response logic of EM materials is urgently needed to face the challenge of EM interference(EMI)and secondary EM pollution better.Herein,PEDOT:PSS-patched magnetic graphene films are fabricated by vacuum-assisted molecular patching engineering,with tunable EM wave response.Based on the observation of micro-nano structure,the dielectric genes are visually revealed,which offers a bran-new horizon for the optimization of EM properties.Impressively,the constructed films achieve double band shielding toward gigahertz wave and infrared radiation.The optimal EMI shielding efficiency exceeds 99%,and covers the entire X-band.Meanwhile,the green shielding index rises from 0.3 to 0.6,indicating that it is a potential green EMI shielding materials.Furthermore,the periodic macroscopic interfaces and the inherent thermal anisotropy endow the films with thermal insulation and flexible in-frared stealth functions in simulated thermal environments.This work refreshes the insight into multi-band shielding,providing a new idea to EM energy governance.展开更多
In extreme ultraviolet(EUV)lithography,mitigation of tin(Sn)debris contamination during EUV light generation is an important issue.In practice,the high-speed jet flows are used to transport debris away from the collec...In extreme ultraviolet(EUV)lithography,mitigation of tin(Sn)debris contamination during EUV light generation is an important issue.In practice,the high-speed jet flows are used to transport debris away from the collector mirror,thereby protecting it and improving system performance.Since EUV light is generated in a near-vacuum environment,understanding jet flow behavior in these extreme conditions is crucial for effective contamination control.In this study,we introduce a new facility designed to investigate jet extruded into near-vacuum environments using particle image velocimetry(PIV)and particle tracking velocimetry(PTV).Our results reveal a significantly extended potential core and a“top-hat”velocity profile with an inlet flow rate of 0.28 standard liter per minute(SLPM)and ambient pressure of 13.9 Pa.We also investigate the effects of inlet flow rate,ambient pressure,and jet diameter on the centerline streamwise velocity of the jet flow.These findings aim to guide the design of equipment operating in vacuum conditions.展开更多
We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation wit...We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation with a high fluence of 1×10^(17)ions/cm^(2).The SMSPD exhibits saturated internal detection efficiency over a broad spectral range from 400 nm to 5μm at 0.32 K,with a minimum timing jitter of 28 ps(at 1064 nm).The detection current scales with photon energy asα≈`0.5,indicating vortex-assisted hotspot formation as the underlying detection mechanism.展开更多
基金supported by Natural Science Foundation of China(Nos.12074095,52273257,52177014,and 51977009)Heilongjiang Provincial Science Foundation for Distin-guished Young Scholars(No.JQ2022A002)2020 Central Govern-ment’s Plan to Support the Talent Training Project of the Reform and Development Fund of Local Universities(No.2020YQ02).
文摘The advent of“intelligent era”brings our life more convenience,but the electromagnetic radiation sur-rounding us not only greatly threatens human health,also makes information leakage and hidden trouble to national defense security.Hence,it is very urgent to develop novel electromagnetic wave absorption materials with lightweight,strong absorption,tunable absorption frequency and broad band absorption.Herein,a novel electromagnetic wave absorber is obtained by constructing La_(0.8)CoO_(3)-rGO nanocompos-ite,where La_(0.8)CoO_(3)nanoparticles are anchored on graphene nanosheets by the electrostatic interaction between GO and La_(0.8)CoO_(3).The effect of hybridization ratio of La_(0.8)CoO_(3)and rGO on microwave ab-sorption properties is carefully studied.The optimal reflection loss of La_(0.8)CoO_(3)-rGO nanocomposite can reach-62.34 dB with the maximum effective bandwidth of 6.08 GHz,presenting 48.78%and 245.45%increment compared to bare La_(0.8)CoO_(3)nanoparticles,respectively.The effective absorption bandwidth covers a broad electromagnetic wave absorption band from Ku band to the C band by tailoring thickness of the absorbers from 2.4 mm to 4.4 mm.The fascinating electromagnetic wave absorption performance is attributed to the synergy effect of La_(0.8)CoO_(3)and rGO,which integrates magnetic and dielectric loss caused by resonance,conductance,relaxation,and scattering loss.This result confirms that La_(0.8)CoO_(3)-rGO nanocomposite is potential candidates toward high-efficiency microwave absorbers and provides a valuable pathway for designing high-performance microwave attenuation materials in the future.
基金financially supported by the National Natural Science Foundation of China(Nos.52373280,52177014,52273257,51977009 and11774027).
文摘The intelligent era brings electronics closer to humans,but also produces a large scale of electromag-netic(EM)radiation simultaneously,which causes serious harm to health and high sophisticated equip-ment.Exploring the underlying response logic of EM materials is urgently needed to face the challenge of EM interference(EMI)and secondary EM pollution better.Herein,PEDOT:PSS-patched magnetic graphene films are fabricated by vacuum-assisted molecular patching engineering,with tunable EM wave response.Based on the observation of micro-nano structure,the dielectric genes are visually revealed,which offers a bran-new horizon for the optimization of EM properties.Impressively,the constructed films achieve double band shielding toward gigahertz wave and infrared radiation.The optimal EMI shielding efficiency exceeds 99%,and covers the entire X-band.Meanwhile,the green shielding index rises from 0.3 to 0.6,indicating that it is a potential green EMI shielding materials.Furthermore,the periodic macroscopic interfaces and the inherent thermal anisotropy endow the films with thermal insulation and flexible in-frared stealth functions in simulated thermal environments.This work refreshes the insight into multi-band shielding,providing a new idea to EM energy governance.
基金supported by the Zhangjiang Laboratory and the National Natural Science Foundation of China(Grant Nos.11988102,12432011,12102246,12422208,and 12372219).
文摘In extreme ultraviolet(EUV)lithography,mitigation of tin(Sn)debris contamination during EUV light generation is an important issue.In practice,the high-speed jet flows are used to transport debris away from the collector mirror,thereby protecting it and improving system performance.Since EUV light is generated in a near-vacuum environment,understanding jet flow behavior in these extreme conditions is crucial for effective contamination control.In this study,we introduce a new facility designed to investigate jet extruded into near-vacuum environments using particle image velocimetry(PIV)and particle tracking velocimetry(PTV).Our results reveal a significantly extended potential core and a“top-hat”velocity profile with an inlet flow rate of 0.28 standard liter per minute(SLPM)and ambient pressure of 13.9 Pa.We also investigate the effects of inlet flow rate,ambient pressure,and jet diameter on the centerline streamwise velocity of the jet flow.These findings aim to guide the design of equipment operating in vacuum conditions.
基金supported by the Quantum Science and Technology-National Science and Technology Major Project(Grant No.2023ZD0300100)the National Natural Science Foundation of China(Grant No.62371443)+3 种基金the Shanghai Sailing Program(Grant No.22YF1456500)the Strategic Priority Research Program(B)of the Chi-nese Academy of Sciences(XDB0580000)the Youth Innovation Promotion Association of CAS(Grant No.2021230)support from the Youth Innovation Promotion Association,CAS(Y2023071)。
文摘We demonstrate a mid-infrared superconducting microstrip single-photon detector(SMSPD)based on a 5 nm thick,0.92-μm wide,and 50μm long NbN microbridge.The detection sensitivity is enhanced via He+ion irradiation with a high fluence of 1×10^(17)ions/cm^(2).The SMSPD exhibits saturated internal detection efficiency over a broad spectral range from 400 nm to 5μm at 0.32 K,with a minimum timing jitter of 28 ps(at 1064 nm).The detection current scales with photon energy asα≈`0.5,indicating vortex-assisted hotspot formation as the underlying detection mechanism.
