Authors: Miao, Lei; Tanemura, Sakae; Huang, Rong; Liu, Chengyan; Huang, Chun Ming; Xu, Gang

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 10, October 2011 , pp. 9267-9273(7)

Publisher: American Scientific Publishers

Abstract:

Monovalent, bivalent and trivalent cations of Li⁺, Sn²⁺, Al³⁺, Fe³⁺ with different values of electronegativity were designed as doped-ions to prepare cations-intercalated titanate nanobelts through ex-situ ion-exchange reaction. XRD results revealed that the d₂₀₀ values of layered TNBs decreased as the following sequence: Li-intercalated TNBs > Al-intercalated TNBs > Fe-intercalated TNBs > Sn-intercalated TNBs. The electronegativity differences between respective doped-cations and oxygen can well explain the trend of the reduction of d₂₀₀ values for the synthesized layered nanobelts with different cations. The width change of nanobelts depending on intercalated cations showed similar tendency as that of d₂₀₀ excluding Sn-intercalated case. That is mostly due to the crystallization of SnO₂ nanoparticles on the nanobelts. Sn²⁺ is easily crystallized to form SnO₂ nanoparticles on the surface of TNBs and being considered as unfavorable metal dopant for the present intercalation purpose. The reduction of d₂₀₀ values of the doped TNBs from that of the undoped TNBs confirms the intercalation of the doped cations into layered structure. Such simple electronegativity-difference depending mechanism may be convenient for the designing of metal ion intercalation into octahedral TiO₆ layered-oxide materials.

Keywords: CATION-INTERCALATED; TITANATE LAYERED STRUCTURES; ELECTRONEGATIVITY DIFFERENCES

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.4318

Publication date: 2011-10-01

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