高指数晶面裸露的贵金属纳米晶体的合成

由于在高指数晶面上存在高密度的台阶位、扭结位原子等,高指数晶面裸露的贵金属纳米晶体一般表现出优越的物理化学性能,在催化、电化学等方面都有很重要的应用前景.近年来,研究人员围绕高指数晶面的制备进行了大量的工作并取得了一定进展.本文重点从合成制备方法的角度出发,结合本课题组的相关研究,系统总结了现有的有关制备高指数晶面裸露的贵金属纳米晶体的一些最新研究成果.从电化学方法、"帽"式试剂保护法、欠电位沉积原子层保护法、动力学调控、氧化刻蚀溶解再生长法以及模板法等几个方面对现有的高指数晶面裸露的贵金属纳米晶体的制备进行了总结

One-step construction of ZnS/C and CdS/C one-dimensional core-shell nanostructures

ZnS/C and CdS/C coaxial core-shell nanowires, which consist of single-crystal semiconductor nanowires encapsulated by carbon nanotubes ( CNTs), have been synthesized by simple one-step thermal processes. These coaxial core-shell nanowires have uniform outer diameters ( 80-180 nm for ZnS/C, 60-130 nm for CdS/C), and uniform shell thicknesses ( ca. tens of nanometers) along their entire lengths up to tens of microns. The growth of the core-shell nanowires follows a novel metal reaction and self-catalysis vapor-liquid-solid ( VLS) mechanism. The simple method could, in principle, be extended to synthesize other metal sulfide single-crystal nanowire-filled carbon nanotubes, which can find potential applications in various fields of nanotechnology

Wet chemical synthesis of intermetallic Pt3Zn nanocrystals via weak reduction reaction together with UPD process and their excellent electrocatalytic performances

Platinum based alloy nanocrystals are promising catalysts for a variety of important practical process. However, it remains a great challenge to synthesize platinum-based intermetallic compound nanocrystals with well-defined surface structures. In this communication, taking the synthesis of concave cubic intermetallic Pt3Zn nanocrystals with {hk0} facets as an example, we proposed a new synthesis strategy for intermetallic compounds by reduction of noble metal precursors via a slow reduction process and reduction of transition metal ions via an underpotential deposition (UPD) process in wet chemical synthesis. The as-prepared intermetallic Pt3Zn nanocrystals exhibited superior CO poisoning tolerance and high electro-catalytic activity in both methanol and formic acid oxidation reactions in comparison with solid solution Pt3Zn nanocrystals and Pt/C. ? The Royal Society of Chemistry 2014

Synthesis of silver nanotubes by electroless deposition in porous anodic aluminium oxide templates

An electroless deposition method has been employed for the synthesis of silver nanotubes using porous anodic aluminium oxide as templates, by which high-yield silver nanotubes with length over ten microns have been synthesized

Shape controlled growth of gold nanoparticles by a solution synthesis

The shape of gold nanoparticles has been successfully tuned among penta-twinned decahedrons, truncated tetrahedrons, cubes, octahedrons, hexagonal thin plates by introducing a small amount of salt into a N,N-dimethylformamide (DMF) solution containing poly(vinyl pyrrolidone) (PVP), and changing the temperature or the concentration of the gold precursor

Facile syntheses and electrocatalytic properties of porous Pd and its alloy nanospheres

Pd-based catalysts are of great interest both for fundamental research and applications. It still remains a challenge to develop reliable and versatile approaches to prepare Pd-based nanostructures with higher performance and better stability. In this article, a facile solution route has been developed to prepare Pd nanospheres, as well as Pd-Pt, Pd-Ag and Pd-Pt-Ag alloy nanospheres. SEM and TEM investigations revealed that the as-prepared nanospheres were three-dimensionally interconnected porous networks with primary nanoparticles as building blocks. The chemical composition of these nanospheres can be easily adjusted by controlling the molar ratio of precursors. Electrochemical measurements indicated that the electrocatalytic activity of these nanospheres towards formic acid oxidation depended on the composition of the nanospheres. By judiciously adjusting the composition of the Pd based alloy nanospheres, the performance of the Pd based catalysts, i.e., the onset potential of the formic acid oxidation, the corresponding peak current density and the ability to tolerate CO, can be optimized.National Natural Science Foundation of China[20725310, 21021061, 21073145]; Key Scientific Project of Fujian Province of China[2009HZ0002-1]; National Basic Research Program of China[2007CB815303, 2009CB939804]; NCET in Fujian Province Universit

Shape-controlled fabrication of porous ZnO architectures and their photocatalytic properties

通讯作者地址: Jiang, ZY (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 电子邮件地址: [email protected], [email protected] this paper, we report a simple two-step approach to prepare porous octahedron- and rod-shaped ZnO architectures. The morphology Of Porous ZnO particles can be conveniently tuned by controlling morphologies of the ZnC(2)O4 center dot 2H(2)O precursor. SEM and TEM characterization results indicate that these porous ZnO architectures are built up by numerous ZnO primary nanoparticles with random attachment. Based on thermogravimetry analysis, we believe that the release of water vapor, CO and CO2 leads to the formation of high-density pores in shape-controlled particles during the calcination process. Further experimental results indicate that as-prepared porous ZnO particles exhibit good photocatalytic activity due to large surface area. (C) 2008 Elsevier Inc. All rights reserved.National Natural Science Foundation of China 20725310 20721001 20673085 20671078 National Basic Research Program of China 2007CB815303 Fujian Province of China 2005HZ01-

Formation of ZnO hexagonal micro-pyramids: a successful control of the exposed polar surfaces with the assistance of an ionic liquid

Wurtzite ZnO hexagonal niicro-pyrantids, with all exposed surfaces being polar +/- (0001) and {10 (1) over bar1} planes, have been successfully synthesized using ionic liquids as solvents

Facile syntheses and enhanced electrocatalytic activities of Pt nanocrystals with {hkk} high-index surfaces

通讯作者地址: Jiang, ZY (通讯作者),Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected]; [email protected] (Pt) is an outstanding catalyst for many important industrial products. Because of its high cost and scarce reserves, it is very important to improve the performance of Pt catalysts. As the metal nanocrystals (NCs) with high-index surfaces usually show very good catalytic activity because of their high density of atomic steps and kinks, the preparation of Pt NCs with high-index facets has become a very important and hot research topic recently. In this article, we report a facile synthesis of high-yield Pt NCs with a series of {hkk} high-index facets including {211} and {411} via a solvothermal method using Pt(II) acetylacetonate as the Pt source, 1-octylamine as the solvent and capping agent, and formaldehyde as an additional surface structure regulator. Multipod Pt NCs with dominant {211} side surfaces were produced without formaldehyde, while concave Pt NCs with dominant {411} surfaces formed under the influence of formaldehyde. By analyzing the products by IR spectroscopy, we found the presence of CO on the surface of concave Pt NCs with {411} surfaces prepared from the solution containing formaldehyde. It was concluded that amine mainly stabilized the monoatomic step edges, resulting in the {211} exposed surface; with addition of formaldehyde, it decomposed into CO, leading to the formation of {411} surfaces by the additional adsorption of the CO on the {100} terraces. In addition, it was found that the as-prepared Pt NCs with high-index {211} and {411} surfaces exhibited much better catalytic activity in the electro-oxidation of ethanol than a commercial Pt/C catalyst or Pt nanocubes with low-index {100} surfaces, and the catalytic activities of Pt crystal facets decreased in the sequence {411}>{211}>{100}.National Basic Research Program of China 2011CBA00508 National Natural Science Foundation of China 21131005 21021061 21073145 21171141 National Fund for Fostering Talents of Basic Science J1030415 Key Scientific Project of Fujian Province of China 2009HZ0002-

Growth of silver nanowires on metal plates by conventional redox displacement

通讯作者地址: Xie, ZX (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surface, Siming Nanlu 422, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Xiamen 361005, Peoples R ChinaSilver nanowires (diameter 20-50 nm, length of the order of mum) have been synthesized in a high yield from nitric acid-treated iron plates dipped in a silver nitrate solution of an appropriate concentration. The formation of the silver nanowires is discussed in terms of silver nitrate concentration, substrate surface morphology and elemental nature of substrate. (C) 2003 Elsevier Science B.V. All rights reserved