Isolating reductive silver kernel from shell is a challenging task but is quite important to understand the embryonic form during the formation of silver nanoclusters.The intercalation of suitable anionic species may ...Isolating reductive silver kernel from shell is a challenging task but is quite important to understand the embryonic form during the formation of silver nanoclusters.The intercalation of suitable anionic species may be of benefit for passivating then capturing such highly active kernel.Herein,we successfully isolated a novel silver thiolate nanocluster[Ag_(13)@Ag_(76)S_(16)(Cyh S)_(42)(p-NH_(2)-Ph As O_(3))_(4)]^(3+)(SD/Ag89 a,Cyh SH=cyclohexanethiol)that contains a well-isolated icosahedral Ag_(13) kernel passivated by four Ag S_(4)^(7-) tetrahedra and four p-NH_(2) Ph As O_(3)^(2-) piercing from outer Ag_(72) shell.Of note,this Ag_(13) kernel is the largest isolable subvalent silver kernel beneath the silver shell with extremely legible core-shell boundary ever before and represents a precise embryonic model formed in the reducing Ag(I)to Ag(0)followed by aggregating to large silver nanoparticles.The reductive role of DMF and the introduction of anionic passivation layer(APL)synergistically modulate the reduction kinetics,facilitating the capture of ultrasmall subvalent silver kernel.SD/Ag89 a emits in near infrared(NIR)region(λ_(em)=800 nm)at low temperature.The synthetic strategy shown in this work opens up new opportunities for precisely capturing and recognizing diverse reductive silver kernels in different systems.展开更多
We report the growth of silver nanowires with varying diameters in porous anodic aluminum-oxide (AAO) membranes by using the electroless deposition approach. This objective is carried out in 2 phases. In Phase 1, AAO ...We report the growth of silver nanowires with varying diameters in porous anodic aluminum-oxide (AAO) membranes by using the electroless deposition approach. This objective is carried out in 2 phases. In Phase 1, AAO membranes on high purity aluminum foils are electrochemically grown by a double anodization procedure. Three different electrolytes, sulphuric acid (H2SO4), oxalic acid (H2C2O4) and phosphoric acid (H3PO4), are employed to produce membranes with varying pore diameters. Other parameters such as interpore distance, barrier layer thickness and membrane thickness are also explored. In addition, characterization to modify the pore diameter and open the barrier layer of free standing AAO templates has been carried out. In Phase 2, metallic silver nanowires are grown by electroless deposition inside pores with varying diameters in AAO membranes. AAO membranes immersed in aqueous silver nitrate solutions are thermally reduced, and the resulting silver nanowires are characterized by using a scanning electron microscope (SEM).展开更多
Physical and mechanical properties of silver-doped layers of titanium alloy Ti6Al4V and 316L steel prepared by pulsed laser deposition were studied. Metallic silver-doped coatings could be a new way for antibacterial ...Physical and mechanical properties of silver-doped layers of titanium alloy Ti6Al4V and 316L steel prepared by pulsed laser deposition were studied. Metallic silver-doped coatings could be a new way for antibacterial protection in medicine. Thin films of silver and silver-doped materials were synthesized using KrF excimer laser deposition. The material was ablated from two targets, which composed either from titanium alloy with silver segments or from steel with silver segments. The concentration of silver ranged from 1.54 at.% to 4.32 at.% for steel and from 3.04 at.% to 13.05 at.% for titanium alloy. The layers properties such as silver content, structure, and adhesion were measured. Adhesion was stu- died using scratch test.展开更多
In this paper, a novel birefringent photonic crystal fiber （PCF） with the silver-coated and liquid-filled air-holes along the vertical plane is designed. Simulation results show that the thickness of silver layer, t...In this paper, a novel birefringent photonic crystal fiber （PCF） with the silver-coated and liquid-filled air-holes along the vertical plane is designed. Simulation results show that the thickness of silver layer, the sizes of holes, and the refractive index of liquid strongly strengthen the gaps between two polarized directions. The surface plasmon resonance peak along y axis can be up to 675.8 dB/cm at 1.33μB. The proposed PCF has important application in polarization devices, such as filters and beam splitters.展开更多
A new silver(I) coordination polymer, [Ag(hmt)(fma) 1/2 ·2H 2O] n (1), (hmt=hexamethylenetetramine, fma=furmaric acid), was obtained by self assembly of hmt, fma and AgNO 3 in the mixed solvent of met...A new silver(I) coordination polymer, [Ag(hmt)(fma) 1/2 ·2H 2O] n (1), (hmt=hexamethylenetetramine, fma=furmaric acid), was obtained by self assembly of hmt, fma and AgNO 3 in the mixed solvent of methanol, dichloromethane and water (CH 3OH∶CH 2Cl 2∶H 2O=5∶5∶1), and characterized by X ray diffraction analysis. Complex 1 belongs to orthorhombic space group Pbcn with cell parameters a =1 72043(5) nm, b = 1 19704(2) nm, c =1 11685(3) nm, V =2 30007(10) nm 3, Z =8, CCDC number: 194381. In complex 1, each hmt ligand acts as a μ 3 bridge to link three Ag(I) atoms and in turn every Ag(I) ion attaches to three hmt ligands to produce a 2D honeycomb network, which is further linked by the bidentate fma ligands to form a 3D noninterpenetrating open framework with one dimensional channels being filled by guest molecules.展开更多
基金supported by the National Natural Science Foundation of China(91961105,21822107,21827801)the Fok Ying Tong Education Foundation(171009)+3 种基金the Natural Science Foundation of Shandong Province(ZR2019ZD45,JQ201803,ZR2020ZD35)the Taishan Scholar Project of Shandong Province of China(tsqn201812003,ts20190908)the Qilu Youth Scholar Funding of Shandong UniversityProject for Scientific Research Innovation Team of Young Scholar in Colleges and Universities of Shandong Province(2019KJC028)。
文摘Isolating reductive silver kernel from shell is a challenging task but is quite important to understand the embryonic form during the formation of silver nanoclusters.The intercalation of suitable anionic species may be of benefit for passivating then capturing such highly active kernel.Herein,we successfully isolated a novel silver thiolate nanocluster[Ag_(13)@Ag_(76)S_(16)(Cyh S)_(42)(p-NH_(2)-Ph As O_(3))_(4)]^(3+)(SD/Ag89 a,Cyh SH=cyclohexanethiol)that contains a well-isolated icosahedral Ag_(13) kernel passivated by four Ag S_(4)^(7-) tetrahedra and four p-NH_(2) Ph As O_(3)^(2-) piercing from outer Ag_(72) shell.Of note,this Ag_(13) kernel is the largest isolable subvalent silver kernel beneath the silver shell with extremely legible core-shell boundary ever before and represents a precise embryonic model formed in the reducing Ag(I)to Ag(0)followed by aggregating to large silver nanoparticles.The reductive role of DMF and the introduction of anionic passivation layer(APL)synergistically modulate the reduction kinetics,facilitating the capture of ultrasmall subvalent silver kernel.SD/Ag89 a emits in near infrared(NIR)region(λ_(em)=800 nm)at low temperature.The synthetic strategy shown in this work opens up new opportunities for precisely capturing and recognizing diverse reductive silver kernels in different systems.
文摘We report the growth of silver nanowires with varying diameters in porous anodic aluminum-oxide (AAO) membranes by using the electroless deposition approach. This objective is carried out in 2 phases. In Phase 1, AAO membranes on high purity aluminum foils are electrochemically grown by a double anodization procedure. Three different electrolytes, sulphuric acid (H2SO4), oxalic acid (H2C2O4) and phosphoric acid (H3PO4), are employed to produce membranes with varying pore diameters. Other parameters such as interpore distance, barrier layer thickness and membrane thickness are also explored. In addition, characterization to modify the pore diameter and open the barrier layer of free standing AAO templates has been carried out. In Phase 2, metallic silver nanowires are grown by electroless deposition inside pores with varying diameters in AAO membranes. AAO membranes immersed in aqueous silver nitrate solutions are thermally reduced, and the resulting silver nanowires are characterized by using a scanning electron microscope (SEM).
文摘Physical and mechanical properties of silver-doped layers of titanium alloy Ti6Al4V and 316L steel prepared by pulsed laser deposition were studied. Metallic silver-doped coatings could be a new way for antibacterial protection in medicine. Thin films of silver and silver-doped materials were synthesized using KrF excimer laser deposition. The material was ablated from two targets, which composed either from titanium alloy with silver segments or from steel with silver segments. The concentration of silver ranged from 1.54 at.% to 4.32 at.% for steel and from 3.04 at.% to 13.05 at.% for titanium alloy. The layers properties such as silver content, structure, and adhesion were measured. Adhesion was stu- died using scratch test.
基金Project partly supported by the National Basic Research Development Program of China(Grant No.2010CB327604)the National Natural Science Foundation of China(Grant No.61377100)the Natural Science Foundation of Guangdong Province,China(Grant No.S2013040015665)
文摘In this paper, a novel birefringent photonic crystal fiber （PCF） with the silver-coated and liquid-filled air-holes along the vertical plane is designed. Simulation results show that the thickness of silver layer, the sizes of holes, and the refractive index of liquid strongly strengthen the gaps between two polarized directions. The surface plasmon resonance peak along y axis can be up to 675.8 dB/cm at 1.33μB. The proposed PCF has important application in polarization devices, such as filters and beam splitters.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 990 10 0 5 )
文摘A new silver(I) coordination polymer, [Ag(hmt)(fma) 1/2 ·2H 2O] n (1), (hmt=hexamethylenetetramine, fma=furmaric acid), was obtained by self assembly of hmt, fma and AgNO 3 in the mixed solvent of methanol, dichloromethane and water (CH 3OH∶CH 2Cl 2∶H 2O=5∶5∶1), and characterized by X ray diffraction analysis. Complex 1 belongs to orthorhombic space group Pbcn with cell parameters a =1 72043(5) nm, b = 1 19704(2) nm, c =1 11685(3) nm, V =2 30007(10) nm 3, Z =8, CCDC number: 194381. In complex 1, each hmt ligand acts as a μ 3 bridge to link three Ag(I) atoms and in turn every Ag(I) ion attaches to three hmt ligands to produce a 2D honeycomb network, which is further linked by the bidentate fma ligands to form a 3D noninterpenetrating open framework with one dimensional channels being filled by guest molecules.
