中空纳米球和中空纳米晶体的声化学制备

Sonochemical preparation of hollow nanospheres and hollow nanocrystals.

作者信息

Dhas N Arul, Suslick Kenneth S

机构信息

School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

出版信息

J Am Chem Soc. 2005 Mar 2;127(8):2368-9. doi: 10.1021/ja049494g.

DOI:10.1021/ja049494g

PMID:15724972

Abstract

Ceramic hollow spheres of MoS2 and MoO3 were obtained by sonochemical synthesis of MoS2 and MoO3 templated on silica nanoparticles (diameters 50-500 nm) followed by acid etching to remove the silica core. The resulting hollow materials have been characterized by elemental analysis, XPS, SEM, TEM, optical absorption, and hydrodesulfurization (HDS) studies. The TEM studies on the hollow ceramic materials indicate the formation of dispersed free spheres with a hollow core. The hollow materials obtained from thermally treated MoS2/SiO2 (450-700 degrees C) show the formation of layered MoS2 (lattice fringes approximately 6.2 A) with a wall thickness of 6-8 layers. The MoS2 hollow spheres are extremely active catalysts for the HDS of thiophene. Hollow spheres of MoO3 are prepared in a similar fashion. Surprisingly, upon heating, hollow crystals of MoO3 with sharp-edged truncated cubes containing inner voids are formed from the initial spheres.

摘要

通过以二氧化硅纳米颗粒（直径50 - 500纳米）为模板对二硫化钼（MoS₂）和三氧化钼（MoO₃）进行声化学合成，随后通过酸蚀刻去除二氧化硅核，从而获得了MoS₂和MoO₃的陶瓷空心球。所得的空心材料已通过元素分析、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、光吸收和加氢脱硫（HDS）研究进行了表征。对空心陶瓷材料的TEM研究表明形成了具有空心核的分散自由球体。从经过热处理的MoS₂/SiO₂（450 - 700摄氏度）获得的空心材料显示出形成了层状的MoS₂（晶格条纹约为6.2埃），壁厚为6 - 8层。MoS₂空心球是噻吩加氢脱硫的极其活跃的催化剂。MoO₃空心球以类似的方式制备。令人惊讶的是，加热时，最初的球体形成了具有包含内部空隙的尖锐边缘截顶立方体的MoO₃空心晶体。