Monodispersed spherical Ru powders are essential for fabricating high-performance Ru sputtering targets,which have applications in very-large-scale integration circuits and magnetic recording devices.However,the synth...Monodispersed spherical Ru powders are essential for fabricating high-performance Ru sputtering targets,which have applications in very-large-scale integration circuits and magnetic recording devices.However,the synthesis of such powders remains a major challenge.Here,we reported the synthesis of monodispersed spherical Ru powders through controlling the molar ratio of SO_(4)^(2-)to Ru^(3+)in urea homogeneous precipitation solution and the annealing conditions.Without the addition of(NH4)2SO_(4)into the reaction solution,only gel-like precipitation particles were obtained.Once introducing(NH_(4))_(2)SO_(4) into the reaction solution and controlling the molar ratio of SO_(4)^(2-)to Ru3+between 0.50 and 1.00,monodispersed spherical precursor powders were obtained.The nucleation and growth of monodispersed spherical precursor particles in solution were found to conform to LaMer's model.Through controlled annealing at 450℃in a hydrogen atmosphere,the obtained metallic Ru powder with an average particle size of 135 nm inherited the spherical morphology and excellent dispersity from the monodispersed spherical precursor powders.These results and findings would deepen the understanding of the preparation of monodispersed Ru and Ru-like powders.展开更多
Due to the unique physical and chemical merits including excellent electrical conductivity,superior chemical stability,and tunable carbon framework,two-dimensional(2 D)porous carbon nanosheets have drawn increasing re...Due to the unique physical and chemical merits including excellent electrical conductivity,superior chemical stability,and tunable carbon framework,two-dimensional(2 D)porous carbon nanosheets have drawn increasing research interest and demonstrated promising potentials in various applications.However,regulating the nanostructure of 2 D porous carbon nanosheets by facile and efficient strategies remains a great challenge.Herein,we develop a new strategy to construct Fe,N-codoped hierarchical porous carbon nanosheets(Fe-N-HPCNS)by using 2 D Fe-Zn layered double hydroxides(Fe-Zn-LDH)as multifunctional templates.Fe-Zn-LDH could functionalize not only as 2 D structure directing agents but also as ternary hierarchical porogens for micro-,meso-and macropores and in situ Fe dopants.This multifunctional templating strategy toward 2 D porous carbon nanosheets can improve the utilization of templates and shows great advantages against conventional procedures that additional porogens and/or dopants are often needed.展开更多
Yolk-shell nanostructures have recently attracted tremendous research interests in various areas because of their unique structural merits.Currently,there is an urgent need for developing porous shells with multifunct...Yolk-shell nanostructures have recently attracted tremendous research interests in various areas because of their unique structural merits.Currently,there is an urgent need for developing porous shells with multifunctional features to enhance their performance in various applications.Herein,advanced yolk-shell nanospheres have been facilely prepared by encapsulating silver nanoparticles with porous Janus polymer shells that consist of a hypercrosslinked polystyrene(xPS)outer layer and a tethered poly(acrylic acid)(PAA)brush lining.The xPS outer layer possesses well-developed porosity as mass diffusion pathways.More importantly,the tethered PAA brushes with customized carboxyl groups exhibit great affinity toward specific species(e.g.,cationic dyes),leading to their enrichment from the bulk solution into the interior cavity.The unusual combination of highly porous outer layers with customizable inbuilt polymer linings in the porous Janus shells endows them with great promise for synergistically catalytic degradation of cationic dyes.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.51977027 and51967008)Yunnan Key Research and Development Program (No.202102AB080008)+2 种基金the Fundamental Research Funds for the Central Universities (Nos.N2002007 and N182508026)the Open Project of Yunnan Precious Metals Laboratory Co.,Ltd. (No.YPML-2023050250)the State Key Laboratory of AdvancedTechnologies for Comprehensive Utilization of Platinum Metals (No.SKL-SPM-202014 and SKL-SPM-202015)。
文摘Monodispersed spherical Ru powders are essential for fabricating high-performance Ru sputtering targets,which have applications in very-large-scale integration circuits and magnetic recording devices.However,the synthesis of such powders remains a major challenge.Here,we reported the synthesis of monodispersed spherical Ru powders through controlling the molar ratio of SO_(4)^(2-)to Ru^(3+)in urea homogeneous precipitation solution and the annealing conditions.Without the addition of(NH4)2SO_(4)into the reaction solution,only gel-like precipitation particles were obtained.Once introducing(NH_(4))_(2)SO_(4) into the reaction solution and controlling the molar ratio of SO_(4)^(2-)to Ru3+between 0.50 and 1.00,monodispersed spherical precursor powders were obtained.The nucleation and growth of monodispersed spherical precursor particles in solution were found to conform to LaMer's model.Through controlled annealing at 450℃in a hydrogen atmosphere,the obtained metallic Ru powder with an average particle size of 135 nm inherited the spherical morphology and excellent dispersity from the monodispersed spherical precursor powders.These results and findings would deepen the understanding of the preparation of monodispersed Ru and Ru-like powders.
基金financially supported by the National Natural Science Foundation of China(Nos.51925308 and 51872336)the Leading Scientific,Technical and Innovation Talents of Guangdong Special Support Program(No.2017TX04C248)+3 种基金the Pearl River Talent Plan of Guangdong(No.2017GC010612)Natural Science Foundation of Guangdong(No.2021A1515011617)the Fundamental Research Funds for the Central Universities(No.20lgzd18)the Science and Technology Program of Guangzhou(Nos.202102021111 and 202002020041)。
文摘Due to the unique physical and chemical merits including excellent electrical conductivity,superior chemical stability,and tunable carbon framework,two-dimensional(2 D)porous carbon nanosheets have drawn increasing research interest and demonstrated promising potentials in various applications.However,regulating the nanostructure of 2 D porous carbon nanosheets by facile and efficient strategies remains a great challenge.Herein,we develop a new strategy to construct Fe,N-codoped hierarchical porous carbon nanosheets(Fe-N-HPCNS)by using 2 D Fe-Zn layered double hydroxides(Fe-Zn-LDH)as multifunctional templates.Fe-Zn-LDH could functionalize not only as 2 D structure directing agents but also as ternary hierarchical porogens for micro-,meso-and macropores and in situ Fe dopants.This multifunctional templating strategy toward 2 D porous carbon nanosheets can improve the utilization of templates and shows great advantages against conventional procedures that additional porogens and/or dopants are often needed.
基金This work was financially supported by the National Natural Science Foundation of China(Nos.51925308,U1601206,51672313,51702370,51872336)National Program for Support of Top-notch Young Professionals,Leading Scientific,Technical and Innovation Talents of Guangdong Special Support Program(No.2017TX04C248)+1 种基金Fundamental Research Funds for the Central Universities(Nos.18lgzd10,17lgpy83)the Science and Technology Program of Guangzhou(No.201704020059).
文摘Yolk-shell nanostructures have recently attracted tremendous research interests in various areas because of their unique structural merits.Currently,there is an urgent need for developing porous shells with multifunctional features to enhance their performance in various applications.Herein,advanced yolk-shell nanospheres have been facilely prepared by encapsulating silver nanoparticles with porous Janus polymer shells that consist of a hypercrosslinked polystyrene(xPS)outer layer and a tethered poly(acrylic acid)(PAA)brush lining.The xPS outer layer possesses well-developed porosity as mass diffusion pathways.More importantly,the tethered PAA brushes with customized carboxyl groups exhibit great affinity toward specific species(e.g.,cationic dyes),leading to their enrichment from the bulk solution into the interior cavity.The unusual combination of highly porous outer layers with customizable inbuilt polymer linings in the porous Janus shells endows them with great promise for synergistically catalytic degradation of cationic dyes.
