Huczko Andrzej, Bystrzejewski Michał, Lange Hubert, Fabianowska Agnieszka, Cudziło Stanisław, Panas Andrzej, Szala Mateusz
Department of Chemistry, Warsaw University, Pasteur 1 Str., 02-093 Warsaw, Poland.
J Phys Chem B. 2005 Sep 1;109(34):16244-51. doi: 10.1021/jp050837m.
1-D nanostructures of cubic phase silicon carbide (beta-SiC) were efficiently produced by combustion synthesis of mixtures containing Si-containing compounds and halocarbons in a calorimetric bomb. The influence of the operating parameters on 1-D SiC formation yield was studied. The heat release, the heating rate, and the chamber pressure increase were monitored during the process. The composition and structural features of the products were characterized by elemental analysis, X-ray diffraction, differential thermal analysis/ thermogravimetric technique, Raman spectroscopy, scanning and transmission electron microscopy, and energy-dispersive X-ray spectrometry. This self-induced growth process can produce SiC nanofibers and nanotubes ca. 20-100 nm in diameter with the aspect ratio higher than 1000. Bulk scale Raman studies showed the product to be comprised of mostly cubic polytype of SiC and that finite size effects are present. We believe that the nucleation mechanism involving radical gaseous species is responsible for 1-D nanostructures growth. The present study has enlarged the family of nanofibers and nanotubes available and offers a possible, new general route to 1-D crystalline materials.
通过在量热弹中燃烧含硅化合物和卤代烃的混合物，高效制备了立方相碳化硅（β-SiC）的一维纳米结构。研究了操作参数对一维SiC形成产率的影响。在此过程中监测了热释放、加热速率和腔室压力增加情况。通过元素分析、X射线衍射、差热分析/热重技术、拉曼光谱、扫描和透射电子显微镜以及能量色散X射线光谱法对产物的组成和结构特征进行了表征。这种自诱导生长过程可以产生直径约20 - 100 nm且长径比高于1000的SiC纳米纤维和纳米管。体相拉曼研究表明，产物主要由立方多型的SiC组成，且存在有限尺寸效应。我们认为，涉及自由基气态物种的成核机制是一维纳米结构生长的原因。本研究扩大了可用纳米纤维和纳米管的种类，并为一维晶体材料提供了一种可能的新通用途径。
