Au-Pt海胆状纳米结构的合成研究
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摘要
采用油胺为还原剂和稳定剂,通过晶种生长法制备了Au-Pt海胆状纳米结构,研究了各种合成条件对产物结构及形貌的影响。结果表明,空气气氛下不能合成Au-Pt双金属杂聚体结构;Pt(acac)2和H2PtCl6·6H2O两种Pt前体对于产物形貌没有明显影响;强极性的1-十八烯参与合成反应时不易得到海胆状的双金属结构;不同Au/Pt配比对产物形貌影响的研究指出,Au-Pt海胆状杂聚体结构的形成是因为后还原的Pt会倾向性地沉积到先还原成核的Au纳米颗粒的特定表面。一锅法合成得到了AuPt合金结构,表明后还原的Pt以Au为晶种,在小尺寸效应作用下使颗粒发生纳米尺度的原子扩散形成了带浓度梯度的AuPt合金。
Au-Pt urchin-like heteroaggregate NPs were synthesized by oleylamine sequential reduction method.The effect of synthesis detail on the formation of Au-Pt urchin-like structures was discussed.It was found that nitrogen protection was required for successful synthesis of Au-Pt dendritic structure and there is no obvious structure change by using Pt(acac)2or H2PtCl6·6H2O.Decahydronaphthalene and 1-octadecene were used as solvents to investigate solvent effect on the formation of urchin-like structures.It was found that 1-octadecene was not suitable for synthesis of Au-Pt urchin-like structures.Through comparison of HRTEM images of AuPt urchin-like NPs at different Au/Pt ratios,it was found that Pt preferred to deposit on certain Au surface.Pt nanoislands on Au surfaces were formed at lower ratio of Pt/Au,and continuous Pt growth resulted in Au-Pt urchin-like heteroaggregate structures.In the one-pot synthesis Au seed NPs were synthesized before Pt reduction,the formation of AuPt alloy structure rather than Au-Pt urchin-like structures was attributed to be small size of Au seeds.
Au-Pt urchin-like heteroaggregate NPs were synthesized by oleylamine sequential reduction method.The effect of synthesis detail on the formation of Au-Pt urchin-like structures was discussed.It was found that nitrogen protection was required for successful synthesis of Au-Pt dendritic structure and there is no obvious structure change by using Pt(acac)2or H2PtCl6·6H2O.Decahydronaphthalene and 1-octadecene were used as solvents to investigate solvent effect on the formation of urchin-like structures.It was found that 1-octadecene was not suitable for synthesis of Au-Pt urchin-like structures.Through comparison of HRTEM images of AuPt urchin-like NPs at different Au/Pt ratios,it was found that Pt preferred to deposit on certain Au surface.Pt nanoislands on Au surfaces were formed at lower ratio of Pt/Au,and continuous Pt growth resulted in Au-Pt urchin-like heteroaggregate structures.In the one-pot synthesis Au seed NPs were synthesized before Pt reduction,the formation of AuPt alloy structure rather than Au-Pt urchin-like structures was attributed to be small size of Au seeds.
引文
1 Chen H,Hu L,Chen M,et al.Nickel-cobalt layered double hydroxide nanosheets for high-performance supercapacitor electrode materials[J].Adv Funct Mater,2014,24(7):934.
2 Hodak J H,et al.Photophysics of nanometer sized metal particles:Electron-phonon coupling and coherent excitation of breathing vibrational modes[J].J Phys Chem B,2000,104:9954.
3 Kumar G V P,Shruthi S,Vibha B,et al.Hot spots in Ag core-Au shell banoparticles potent for surface-enhanced raman scattering studies of biomolecules[J].J Phys Chem C,2007,111:4388.
4 Barth J V,Costantini G,Kern K.Engineering atomic and molecular nanostructures at surfaces[J].Nature,2014,437(7059):671.
5 Sun S,Murray C B,Weller D,et al.Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices[J].Science,2000,287:1989.
6 Teng X,Yang H.Synthesis of face-centered tetragonal FePt nanoparticles and granular films from Pt@Fe2O3core-shell nanoparticles[J].J Am Chem Soc,2003,125:14559.
7 Hatton B D,Landskron K,Whitnall W,et al.Structural characterization and adsorption properties of pluronic F127onto iron oxides magnetic nanoparticles[J].J Nanosci Nanotechnol,2014,14(3):2361.
8 Wang H,Rempel G L.Bimetallic dendrimer-encapsulated nanoparticle catalysts[J].Polym Rev,2016,56(3):486.
9 Zhou S,Jackson G S,Eichhorn B.AuPt alloy nanoparticles for COtolerant hydrogen activation:Architectural effects in Au-Pt bimetallic nanocatalysts[J].Adv Funct Mater,2007,17:3099.
10 Liu G L,Niu T,Cao A,et al.The deactivation of Cu-Co alloy nanoparticles supported on ZrO2for higher alcohols synthesis from syngas.[J].Fuel,2016,176:1.
11 Li L,Xing Y.Pt-Ru nanoparticles supported on carbon nanotubes as methanol fuel cell catalysts[J].J Phys Chem C,2007,111(6):2803.
12 Suzuka T,Sueyoshi H,Maehara S,et al.Reactivity of aryl halides for reductive dehalogenation in(sea)water using polymer-supported terpyridine palladium catalyst[J].Molecules,2015,20(6):9906.
13 Pedersen M,Helveg S,Ruban A,et al.How a gold substrate can increase the reactivity of a Pt overlayer[J].Surf Sci,1999,426:395.
14 Ge X B,Wang R Y,Liu P P,et al.Platium-decorated nanoporous gold leaf for methanol electrooxidation[J].Chem Mater,2007,19:5827.
15 Zhang J,Sasaki K,et al.Stabilization of platinum oxygen-reduction electrocatalysts using old clusters[J].Science,2007,315:220.
16 Lang H,Maldonado S,Stevenson K J,et al.Synthesis and characterization of dendrimer templated supported bimetallic Pt-Au nanoparticles[J].J Am Chem Soc,2004,126:12949.
17 Wu M L,Chen D H,Huang T C.Preparation of Au/Pt bimetallic nanoparticles in water-in-oil microemulsions[J].Chem Mater,2001,13:599.
18 Mandal S,Mandale A B,Sastry M.Keggin ion-mediated synthesis of aqueous phase-pure Au@Pd and Au@Pt core-shell nanoparticles[J].J Mater Chem,2004,14:2868.
19 Damle C,Biswas K,Sastry M.Synthesis of Au-Core/Pt-shell nanoparticles within thermally evaporated fatty amine films and their lowtemperature alloying[J].Langmuir,2001,17:7156.
20 Zhou S,Mcllwrath K,Jackson G,et al.Enhanced CO tolerance for hydrogen activation in Au-Pt dendritic heteroaggregate nanostructures[J].J Am Chem Soc,2006,128:1780.
21 Chen Y W,Ma M,Yu X F,et al.Study on synthesis mechanism of Au-based dendritic heteroaggregate nanoparticles[J].Mater Rev:Res,2015,29(4):74(in Chinese).陈有为,马明,俞雄飞,等.Au基树枝状杂聚体纳米结构形成机理研究[J].材料导报:研究篇,2015,29(4):74.
22 Heo J,Kim D S,Kim Z H,et al.Controlled synthesis and characterization of the enhanced local field of octahedral Au nanocrystals[J].Chem Commun,2008,46:6120.
23 Wang L,Qi B,Sun L,et al.Synthesis and assembly of Au-Pt bimetallic nanoparticles[J].Mater Lett,2008,62:1279.
24 Chen Y W,Wang W G,Zhou S H.Size effect of Au seeds on structure of Au-Pt bimetallic nanoparticles[J].Mater Lett,2011,65:2649.
2 Hodak J H,et al.Photophysics of nanometer sized metal particles:Electron-phonon coupling and coherent excitation of breathing vibrational modes[J].J Phys Chem B,2000,104:9954.
3 Kumar G V P,Shruthi S,Vibha B,et al.Hot spots in Ag core-Au shell banoparticles potent for surface-enhanced raman scattering studies of biomolecules[J].J Phys Chem C,2007,111:4388.
4 Barth J V,Costantini G,Kern K.Engineering atomic and molecular nanostructures at surfaces[J].Nature,2014,437(7059):671.
5 Sun S,Murray C B,Weller D,et al.Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices[J].Science,2000,287:1989.
6 Teng X,Yang H.Synthesis of face-centered tetragonal FePt nanoparticles and granular films from Pt@Fe2O3core-shell nanoparticles[J].J Am Chem Soc,2003,125:14559.
7 Hatton B D,Landskron K,Whitnall W,et al.Structural characterization and adsorption properties of pluronic F127onto iron oxides magnetic nanoparticles[J].J Nanosci Nanotechnol,2014,14(3):2361.
8 Wang H,Rempel G L.Bimetallic dendrimer-encapsulated nanoparticle catalysts[J].Polym Rev,2016,56(3):486.
9 Zhou S,Jackson G S,Eichhorn B.AuPt alloy nanoparticles for COtolerant hydrogen activation:Architectural effects in Au-Pt bimetallic nanocatalysts[J].Adv Funct Mater,2007,17:3099.
10 Liu G L,Niu T,Cao A,et al.The deactivation of Cu-Co alloy nanoparticles supported on ZrO2for higher alcohols synthesis from syngas.[J].Fuel,2016,176:1.
11 Li L,Xing Y.Pt-Ru nanoparticles supported on carbon nanotubes as methanol fuel cell catalysts[J].J Phys Chem C,2007,111(6):2803.
12 Suzuka T,Sueyoshi H,Maehara S,et al.Reactivity of aryl halides for reductive dehalogenation in(sea)water using polymer-supported terpyridine palladium catalyst[J].Molecules,2015,20(6):9906.
13 Pedersen M,Helveg S,Ruban A,et al.How a gold substrate can increase the reactivity of a Pt overlayer[J].Surf Sci,1999,426:395.
14 Ge X B,Wang R Y,Liu P P,et al.Platium-decorated nanoporous gold leaf for methanol electrooxidation[J].Chem Mater,2007,19:5827.
15 Zhang J,Sasaki K,et al.Stabilization of platinum oxygen-reduction electrocatalysts using old clusters[J].Science,2007,315:220.
16 Lang H,Maldonado S,Stevenson K J,et al.Synthesis and characterization of dendrimer templated supported bimetallic Pt-Au nanoparticles[J].J Am Chem Soc,2004,126:12949.
17 Wu M L,Chen D H,Huang T C.Preparation of Au/Pt bimetallic nanoparticles in water-in-oil microemulsions[J].Chem Mater,2001,13:599.
18 Mandal S,Mandale A B,Sastry M.Keggin ion-mediated synthesis of aqueous phase-pure Au@Pd and Au@Pt core-shell nanoparticles[J].J Mater Chem,2004,14:2868.
19 Damle C,Biswas K,Sastry M.Synthesis of Au-Core/Pt-shell nanoparticles within thermally evaporated fatty amine films and their lowtemperature alloying[J].Langmuir,2001,17:7156.
20 Zhou S,Mcllwrath K,Jackson G,et al.Enhanced CO tolerance for hydrogen activation in Au-Pt dendritic heteroaggregate nanostructures[J].J Am Chem Soc,2006,128:1780.
21 Chen Y W,Ma M,Yu X F,et al.Study on synthesis mechanism of Au-based dendritic heteroaggregate nanoparticles[J].Mater Rev:Res,2015,29(4):74(in Chinese).陈有为,马明,俞雄飞,等.Au基树枝状杂聚体纳米结构形成机理研究[J].材料导报:研究篇,2015,29(4):74.
22 Heo J,Kim D S,Kim Z H,et al.Controlled synthesis and characterization of the enhanced local field of octahedral Au nanocrystals[J].Chem Commun,2008,46:6120.
23 Wang L,Qi B,Sun L,et al.Synthesis and assembly of Au-Pt bimetallic nanoparticles[J].Mater Lett,2008,62:1279.
24 Chen Y W,Wang W G,Zhou S H.Size effect of Au seeds on structure of Au-Pt bimetallic nanoparticles[J].Mater Lett,2011,65:2649.