Bimetallic nanomaterials with porous structures are appealing to wide attention because of their large specific surface area, open and accessible pores, and free-standing features, but there still remain huge challenges for the green and mild one-pot preparation of well-defined porous bimetallic nanomaterials. Herein, an aqueous synthetic protocol is developed for the one-pot fabrication of mesoporous Au-Pd nanospheres (MNSs) under the regulation of a poly(ionic liquid) 1-butyl-3-methylimidazole polystyrenesulfonate ([Bmim] n [PSS]) at room temperature. The obtained Au-Pd MNSs have uniform spherical morphology, narrow size distribution (45 +/- 15 nm), and abundant mesopores. It is shown that [Bmim] n [PSS] serves as structure-directing agent to direct the growth and construction of Au-Pd MNSs. Possessing a large specific surface area, plentiful and open mesopores, and a strong electronic interaction between Au and Pd, Au-Pd MNSs-1 exhibit high catalytic activity, selectivity, and stability in the catalytic oxidation of p-hydroxybenzyl alcohol. Within 60.0 min, p-hydroxybenzyl alcohol can be completely converted and the selectivity toward p-hydroxybenzaldehyde is as high as 100%. After four cycles, 100% selectivity and 88% conversion are still maintained.

室温条件下,在离子液体四丙基铵甘氨酸盐([N3333][Gly])调控作用下,从水溶液中一步制备出多孔蠕虫Au微纳米材料.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X-射线衍射仪(XRD)对产物的形貌和结构进行了表征.研究结果表明:制备的多孔蠕虫Au由大量粒径为6～12 nm的Au纳米粒子组成,长度为0.3～0.6μm,宽度为100～150 nm,并存在大量的孔.多孔蠕虫Au对对硝基苯乙腈还原表现出较高的催化活性,反应速率常数为0.024 s-1;同时,多孔蠕虫Au也能够高效催化降解亚甲基蓝和刚果红,反应速率常数分别为0.0086 s-1和0.0042 s-1.

Conceiving a simple, green, and mild one-pot route to grow and construct anisotropic bimetallic 3D architectures with multilevel structures and promising functions is highly desirable and technical...

With the assistance of a functionalized ionic liquid, 1-hydroxyethyl-3-methylimidazolium chloride ([HEmim] Cl), the porous sponge-like AuPd nanomaterials was quickly one-pot synthesized in aqueous solution at room temperature. Using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray energy spectroscopy (EDX) and X-ray diffraction (XRD), the structures and composition of as-prepared sponge-like AuPd nanomaterials were characterized and analyzed. The results show that the AuPd nanosponges have alloy structures and are formed via the aggregation and fusion of roughed nanoparticles. With different molar ratios of HAuCl4 and Na2PdCl4 precursors (3:1, 1:1 or 1:3), all the products prepared have sponge-like alloy structures. The ionic liquid plays an important role for the construction of AuPd sponge-like structures. Futhermore, all the as-obtained AuPd nanosponges exhibit excellent catalytic performance than commercial Pd/C in the reaction of p-nitrophenol reduction, in which the Au, Pd-3 nanosponges have the highest catalytic activity. In the presence of Au, Pd-3 nanosponges , the reaction can be finished within only 98 s and the reaction rate constant is calculated to be 0. 0143 s(-1), which is 2. 3 times higher than commercial Pd/C. Yet, the current protocol can be used to grow and assemble other bi-metallic (such as PdCu and PtCu) and multi-metallic nanosponges.

The ultra-large, single-crystal Ag nanosheets and their assembled films can be easily one-pot prepared at room temperature via a chloroform-water interfacial reaction route with o-ethoxyaniline (OEA) in chloroform as reductant and AgNO3 in water as precursor. The as-obtained single-crystal Ag nanosheets can reach as large as 16 mu m in side length and as thin as 22 nm in thickness. The results show that reagent concentrations, temperature and organic phase in current liquid-liquid reaction have significant influences on the formation of Ag sheet-like nanostructures. The possible mechanism was proposed for the growth and formation of Ag nanosheets and their assembled films. Furthermore, using p-aminothiophenol (PATP) as a model molecular probe, the Ag nanosheet-assembled films exhibit outstanding surface-enhanced Raman scattering (SERS) response and high reproducibility.

在室温水溶液中,采用离子液体[C4 im]Cl调控合成了AuPd纳米刺球.采用多种表征技术对产品的形貌和结构进行了分析.研究结果表明:所制备的AuPd纳米刺球由0.5～1.0μm的球形颗粒组成.颗粒表面较为粗糙,有许多纳米级颗粒组成的尖刺,具有明显的微纳分级结构.同时,AuPd刺球在有机染料亚甲基蓝的降解过程中表现出良好的催化活性,整个反应过程仅需150 s,反应速率常数为0.0174 s-1,其催化活性是商用Pd/C催化剂的1.67倍.