Facile synthesis of hematite nanoplates and their self-assembly generated by domain growth of NaCl. (May 2015)

• Record Type: Journal Article
• Authors: Yang, Ping; Wang, Dan; Zhao, Jie; Shi, Ruixia
• Is Part Of: Materials research bulletin. Volume 65(2015:May)
• Page Start: 36
• Page End: 41
• Publication Date: 2015-05
• Subjects: A. Nanostructures -- A. Oxides -- B. Solvothermal -- C. X-ray diffraction -- C. Transmission electron microscopy (TEM); Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.01.002
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Hematite nanoplates with exposed (0 0 1) facets were fabricated through a solvothermal process using FeCl3 and CH3 COONa in an ethanol solution because of CH3 COO − groups ascribed on the (0 0 1) facets of Fe2 O3 . The self-assembly of the nanoplates into one- or three-dimensional dendritic morphology occurred through a droplet dewetting technique by using NaCl molecules as scaffolds. Highlights: Hematite nanoplates with exposed (0 0 1) facets were fabricated via a solvothermal process. Other morphologies were created through adjusting the amount of CH3 COONa. The self-assembly of the nanoplates into one- or three-dimensional dendritic morphology. Abstract: Hematite nanoplates with exposed (0 0 1) facets were fabricated through a solvothermal process using FeCl3 and CH3 COONa in an ethanol solution because of CH3 COO − groups ascribed on the (0 0 1) facets of Fe2 O3 . Hexagonal-like nanoplates, octahedron, and nanoplates were created through adjusting the amount of CH3 COONa. Solvents were crucial for the preparation of the nanoplates because irregular Fe2 O3 particles rather than nanoplates were created once isopropanol or the mixture of water and ethanol instead of ethanol. The growth process of Fe2 O3 with various morphologies was discussed. Additionally, we observed the self-assembly of the nanoplates into one- or three-dimensional dendritic morphology through a droplet dewetting technique by using NaCl molecules as scaffolds. This phenomenon is ascribed to the domain growth of NaCl to form fractal shapes and a hydrodynamic mechanism through outward capillary flow. The morphologies of the assemblies are related to the evaporation speed of solvent during droplet dewetting.