Mechanistic Insights into Formation of SnO2 Nanotubes

Aug 27, 2014 - A general precursor strategy for one-dimensional titania with surface nanoprotrusion and tunable structural hierarchy. Yun Wang , Haibo...
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Article pubs.acs.org/Langmuir

Mechanistic Insights into Formation of SnO2 Nanotubes: Asynchronous Decomposition of Poly(vinylpyrrolidone) in Electrospun Fibers during Calcining Process Jinjin Wu,† Dawen Zeng,*,† Xiaoxia Wang,‡ Lei Zeng,‡ Qingwu Huang,§ Gen Tang,† and Changsheng Xie*,‡ †

State Key Laboratory of Materials Processing and Die & Mold Technology, ‡Nanomaterials and Smart Sensors Laboratory, Department of Materials Science and Engineering, and §Analytical and Testing Center, Huazhong University of Science and Technology (HUST), No. 1037, Luoyu Road, Wuhan 430074, China ABSTRACT: The formation mechanism of SnO2 nanotubes (NTs) fabricated by generic electrospinning and calcining was revealed by systematically investigating the structural evolution of calcined fibers, product composition, and released volatile byproducts. The structural evolution of the fibers proceeded sequentially from dense fiber to wire-in-tube to nanotube. This remarkable structural evolution indicated a disparate thermal decomposition of poly(vinylpyrrolidone) (PVP) in the interior and the surface of the fibers. PVP on the surface of the outer fibers decomposed completely at a lower temperature (