The heating-induced unprecedented monotonous increase in Yb3+excited state(^(2)F5/2)lifetime is found in Nd^(3+)/Yb^(3+)codoped fluoride nanoparticles,which is proved to originate from the alleviation of energy migrat...The heating-induced unprecedented monotonous increase in Yb3+excited state(^(2)F5/2)lifetime is found in Nd^(3+)/Yb^(3+)codoped fluoride nanoparticles,which is proved to originate from the alleviation of energy migration-mediated surface quenching with elevated temperature.This unique phenomenon is evaluated for thermometric performance in terms of lifetime luminescence thermometry,and the maximum absolute/relative temperature sensitivity(S_(a)/S_(r))reaches as high as 2.68μs K^(−1)/1.59%K^(−1)in the biological temperature region,indicating that the studied nanomaterial can offer great potential for lifetime luminescence thermometry in biological areas.展开更多
Rational design and synthesis of efficient,stable and low-cost electrocatalysts for oxygen evolution reaction(OER)is critical for renewable energy conversion and storage.Herein,the reduction-engraved strategy was adop...Rational design and synthesis of efficient,stable and low-cost electrocatalysts for oxygen evolution reaction(OER)is critical for renewable energy conversion and storage.Herein,the reduction-engraved strategy was adopted to treat crystalline ferrite nanoparticles,which are highly dispersed on graphene oxide(GO)nanosheets.This reduction treatment generated abundant oxygen vacancies on the surface of nano-scale ferrites and dramatically enhanced their surface area.展开更多
Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their anten...Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their antenna size is required to be inversely proportional to the frequency,so that their mobility and flexibility are greatly limited.Here we introduce a novel prototype of LF receiving antennas based on optically levitated nanoparticles,which overcomes the size-frequency limitation to reduce the antenna size to the hundred-nanometer scale.These charged particles are extremely sensitive to external electric field as mechanical resonators,and their resonant frequencies are adjustable.The effectiveness of these antennas was experimentally demonstrated by using the frequency shift keying(2FSK)modulation scheme.The experimental results indicate a correlation between error rate and factors such as transmission rate,signal strength,and vacuum degree with a signal strength of approximately 0.1V/m and a bit error rate below 0.1%.We extend the application of levitated particle mechanical resonators as an entirely new type of compact LF antennas,which may be utilized in long-distance communications in extreme environments.展开更多
基金supported by the National Natural Science Foundation of China(11774346,11674318,51472242,51872288).
文摘The heating-induced unprecedented monotonous increase in Yb3+excited state(^(2)F5/2)lifetime is found in Nd^(3+)/Yb^(3+)codoped fluoride nanoparticles,which is proved to originate from the alleviation of energy migration-mediated surface quenching with elevated temperature.This unique phenomenon is evaluated for thermometric performance in terms of lifetime luminescence thermometry,and the maximum absolute/relative temperature sensitivity(S_(a)/S_(r))reaches as high as 2.68μs K^(−1)/1.59%K^(−1)in the biological temperature region,indicating that the studied nanomaterial can offer great potential for lifetime luminescence thermometry in biological areas.
基金supported by the 973 program of China(2014CB845602)the NSFC(21331007/21671032/21722104)the NSF of Guangdong Province(S2012030006240).
文摘Rational design and synthesis of efficient,stable and low-cost electrocatalysts for oxygen evolution reaction(OER)is critical for renewable energy conversion and storage.Herein,the reduction-engraved strategy was adopted to treat crystalline ferrite nanoparticles,which are highly dispersed on graphene oxide(GO)nanosheets.This reduction treatment generated abundant oxygen vacancies on the surface of nano-scale ferrites and dramatically enhanced their surface area.
基金supported by National Key Research and Development Program of China(2022YFB3203402)Major Project of Natural Science Foundation of Zhejiang Province(LD22F050002)+2 种基金Major Scientific Research Project of Zhejiang Lab(2019MB0AD01)institute-initiated Research Project of Zhejiang Lab(2024SSYS0014)National Natural Science Foundation of China(62005248).
文摘Low-frequency(LF)wireless communications play a crucial role in ensuring antiinterference,long-range,and efficient communication across various environments.However,in conventional LF communication systems,their antenna size is required to be inversely proportional to the frequency,so that their mobility and flexibility are greatly limited.Here we introduce a novel prototype of LF receiving antennas based on optically levitated nanoparticles,which overcomes the size-frequency limitation to reduce the antenna size to the hundred-nanometer scale.These charged particles are extremely sensitive to external electric field as mechanical resonators,and their resonant frequencies are adjustable.The effectiveness of these antennas was experimentally demonstrated by using the frequency shift keying(2FSK)modulation scheme.The experimental results indicate a correlation between error rate and factors such as transmission rate,signal strength,and vacuum degree with a signal strength of approximately 0.1V/m and a bit error rate below 0.1%.We extend the application of levitated particle mechanical resonators as an entirely new type of compact LF antennas,which may be utilized in long-distance communications in extreme environments.
