Evolution in microstructural properties of cetyltrimethylammonium bromide-templated mesoporous tin oxide upon thermal crystallization
Journal
Journal of the American Ceramic Society
Journal Volume
87
Journal Issue
9
Pages
1741-1746
Date Issued
2004
Author(s)
Abstract
Mesoporous crystalline SnO 2 was synthesized using a supermolecule‐templating process, in which cetyltrimethylammonium bromide (CTAB) was introduced into a homogenously peptized tin oxyhydroxide sol, followed by calcination in air. The templated powders were calcined either with or without being subjected to a hexamethyldisilazane (HMDS) pretreatment, and the microstructures were characterized as a function of calcination temperature up to 800°C. Organized mesostructure was initially obtained, and grain growth on calcination was the primary factor that destabilized the mesostructure. Compared with the conventional sol–gel process, the templating process promotes the formation of mesoporosity, enlarges pore volume, and drastically slows grain growth. The HMDS treatment further inhibits grain growth above 400°C. The combination of these processes facilitates formation of fully crystallized mesoporous SnO 2 materials with very large surface areas. Fully crystallized mesoporous SnO 2 that has a surface area of 220 m 2 /g has been thus obtained by calcination up to 500°C.
SDGs
Type
journal article