Owing to their multi-elemental compositions and unique high-entropy mixing states,high-entropy alloy(HEA)nanoparticles(NPs)displaying tunable activities and enhanced stabilities thus have become a rapidly growing area...Owing to their multi-elemental compositions and unique high-entropy mixing states,high-entropy alloy(HEA)nanoparticles(NPs)displaying tunable activities and enhanced stabilities thus have become a rapidly growing area of research in recent years.However,the integration of multiple elements into HEA NPs at the nanoscale remains a formidable challenge,especially when it comes to the precise control of particle size,elemental composition and content.Herein,a simple and universal high-energy laser assisted reduction approach is presented,which achieves the preparation of HEA NPs with a wide range of multi-component,controllable particle sizes and constitution on different substrates within seconds.Laser on carbon nanofibers induced momentary high-temperature annealing(>2000 K and ramping/cooling rates>10^(5)K s^(-1))to successfully decorate HEA NPs up to twenty elements with excellent compatibility for large-scale synthesis(20.0×20.0 cm^(2)of carbon cloth).The IrPdPtRhRu exhibit robust electrocatalytic hydrogen evolution reaction(HER)activities and low overpotentials of 16,28,and 12 mV at a current density of 10 mA cm^(-2)in alkaline(1.0 M KOH),alkaline simulated seawater(1.0 M KOH+0.5 M NaCl),and acidic(0.5 M H_(2)SO_(4))electrolytes,respectively,and excellent stability(7 days and>2000 cycles)at the alkaline HER.展开更多
Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the ente...Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the entertainment,health monitoring, and medical care sectors. In this work,conducting copper electrodes were fabricated onpolydimethylsiloxane as sensitive stretchable microsensors by integrating laser direct writing and transfer printing approaches. The copper electrode was reduced from copper salt using laser writing rather than the general approach of printing with pre-synthesized copper or copper oxide nanoparticles. An electrical resistivity of 96 l X cm was achieved on 40-lm-thick Cu electrodes on flexible substrates. The motion sensing functionality successfully demonstrated a high sensitivity and mechanical robustness.This in situ fabrication method leads to a path toward electronic devices on flexible substrates.展开更多
Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial applications.Graphene-based materials can a...Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial applications.Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials.In this work,we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system.We experimentally validate our strategies via demonstrations of two graphene oxide metalenses:one with an ultra-long(~16λ)optical needle,and the other with axial multifocal spots,at the wavelength of 632.8 nm with a 200 nm thin film.Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.展开更多
Nanomaterials with tailored structures and surface chemistry are in high demand, as these materials play increasingly important roles in biology, catalysis, energy storage, and manufacturing. Their heightened demand h...Nanomaterials with tailored structures and surface chemistry are in high demand, as these materials play increasingly important roles in biology, catalysis, energy storage, and manufacturing. Their heightened demand has attracted attention towards the development of synthesis routes, particularly, laser-synthesis techniques. These efforts drove the refinement of laser ablation in liquid(LAL) and related methods over the past two decades and have led to the emergence of reactive laser-synthesis techniques that exploit these methods’ characteristic, non-equilibrium conditions. Reactive laser-synthesis approaches foster unique chemical reactions that enable the formation of composite products like multimetallic nanoparticles, supported nanostructures, and complex minerals. This review will examine emerging reactive laser-synthesis methods in the context of established methods like LAL.The focus will be on the chemical reactions initiated within the laser plasma, with the goal of understanding how these reactions lead to the formation of unique nanomaterials. We will provide the first systematic review of laser reaction in liquid(LRL) in the literature, and bring a focus to the chemical reaction mechanisms in LAL and reactive-LAL techniques that have not yet been emphasized in reviews. Discussion of the current challenges and future investigative opportunities into reactive laser-synthesis will impart guidance for researchers interested in designing reactive laser-synthesis approaches to novel nanomaterial production.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52072274 and 52104309)the Knowledge Innovation Project of Wuhan,China(2023020201010131).
文摘Owing to their multi-elemental compositions and unique high-entropy mixing states,high-entropy alloy(HEA)nanoparticles(NPs)displaying tunable activities and enhanced stabilities thus have become a rapidly growing area of research in recent years.However,the integration of multiple elements into HEA NPs at the nanoscale remains a formidable challenge,especially when it comes to the precise control of particle size,elemental composition and content.Herein,a simple and universal high-energy laser assisted reduction approach is presented,which achieves the preparation of HEA NPs with a wide range of multi-component,controllable particle sizes and constitution on different substrates within seconds.Laser on carbon nanofibers induced momentary high-temperature annealing(>2000 K and ramping/cooling rates>10^(5)K s^(-1))to successfully decorate HEA NPs up to twenty elements with excellent compatibility for large-scale synthesis(20.0×20.0 cm^(2)of carbon cloth).The IrPdPtRhRu exhibit robust electrocatalytic hydrogen evolution reaction(HER)activities and low overpotentials of 16,28,and 12 mV at a current density of 10 mA cm^(-2)in alkaline(1.0 M KOH),alkaline simulated seawater(1.0 M KOH+0.5 M NaCl),and acidic(0.5 M H_(2)SO_(4))electrolytes,respectively,and excellent stability(7 days and>2000 cycles)at the alkaline HER.
基金supported by National Natural Science Foundation of China (51575016)the Beijing Oversea High-Level Talent Project+1 种基金strategic research Grant (KZ20141000500, B-type) of Beijing Natural Science Foundation P.R. Chinathe support by the China Scholarship Council (20160654015) for his research stay at the Institute of Physical and Chemical Research,Wako, Japan
文摘Stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the entertainment,health monitoring, and medical care sectors. In this work,conducting copper electrodes were fabricated onpolydimethylsiloxane as sensitive stretchable microsensors by integrating laser direct writing and transfer printing approaches. The copper electrode was reduced from copper salt using laser writing rather than the general approach of printing with pre-synthesized copper or copper oxide nanoparticles. An electrical resistivity of 96 l X cm was achieved on 40-lm-thick Cu electrodes on flexible substrates. The motion sensing functionality successfully demonstrated a high sensitivity and mechanical robustness.This in situ fabrication method leads to a path toward electronic devices on flexible substrates.
基金Hongtao Wang acknowledges the support from National Key Research and Development Program of China(2017YFB0403602)China Scholarship Council.Baohua Jia acknowledges the support from the Australian Research Council through the Discovery Projects(DP150102972,DP190103186)+5 种基金the Industrial Transformation Training Centres scheme(Grant No.IC180100005)support from Defence Science Institute(DSI)and Defence Science and Technology Group(DSTG).C.W.Q.acknowledges the support from the National Research Foundation,Prime Minister’s Office,Singapore,under its Competitive Research Programme(CRP award NRF CRP22-2019-0006)Advanced Research and Technology Innovation Centre(ARTIC)under the grant(R-261-518-004-720)A STAR under Advanced Manufacturing and Engineering(AME)Individual Research Grant(IRG A2083c0060)Tian Lan acknowledges National Key Basic Research Program 973 Project(2013CB329202)National Major Scientific Instruments and Equipments Development Project supported by National Natural Science Foundation of China(No.61827814).
文摘Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial applications.Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials.In this work,we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system.We experimentally validate our strategies via demonstrations of two graphene oxide metalenses:one with an ultra-long(~16λ)optical needle,and the other with axial multifocal spots,at the wavelength of 632.8 nm with a 200 nm thin film.Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.
文摘Nanomaterials with tailored structures and surface chemistry are in high demand, as these materials play increasingly important roles in biology, catalysis, energy storage, and manufacturing. Their heightened demand has attracted attention towards the development of synthesis routes, particularly, laser-synthesis techniques. These efforts drove the refinement of laser ablation in liquid(LAL) and related methods over the past two decades and have led to the emergence of reactive laser-synthesis techniques that exploit these methods’ characteristic, non-equilibrium conditions. Reactive laser-synthesis approaches foster unique chemical reactions that enable the formation of composite products like multimetallic nanoparticles, supported nanostructures, and complex minerals. This review will examine emerging reactive laser-synthesis methods in the context of established methods like LAL.The focus will be on the chemical reactions initiated within the laser plasma, with the goal of understanding how these reactions lead to the formation of unique nanomaterials. We will provide the first systematic review of laser reaction in liquid(LRL) in the literature, and bring a focus to the chemical reaction mechanisms in LAL and reactive-LAL techniques that have not yet been emphasized in reviews. Discussion of the current challenges and future investigative opportunities into reactive laser-synthesis will impart guidance for researchers interested in designing reactive laser-synthesis approaches to novel nanomaterial production.
