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SnO2 Quantum Dots and Quantum Wires: Controllable Synthesis, Self-Assembled 2D Architectures, and Gas-Sensing Properties

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Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
Cite this: J. Am. Chem. Soc. 2008, 130, 37, 12527–12535
Publication Date (Web):August 21, 2008
Copyright © 2008 American Chemical Society

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    SnO2 quantum dots (QDs) and ultrathin nanowires (NWs) with diameters of ∼0.5−2.5 and ∼1.5−4.5 nm, respectively, were controllably synthesized in a simple solution system. They are supposed to be ideal models for studying the continuous evolution of the quantum-confinement effect in SnO2 1D → 0D systems. The observed transition from strong to weak quantum confinement in SnO2 QDs and ultrathin NWs is interpreted through the use of the Brus effective-mass approximation and the Nosaka finite-depth well model. Photoluminescence properties that were coinfluenced by size effects, defects (oxygen vacancies), and surface capping are discussed in detail. With the SnO2 QDs as building blocks, various 2D porous structures with ordered hexagonal, distorted hexagonal, and square patterns were prepared on silicon-wafer surfaces and exhibited optical features of 2D photonic crystals and enhanced gas sensitivity.

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    HRTEM/TEM images of SnO2s-QDs and oriented attachment of ultrathin SnO2 NWs, TEM image of me-NCs, PL spectra of dodecanethiol-exchanged SnO2 NWs for different excitation wavelengths, transmission spectrum of 2D photonic crystals self-assembled by SnO2 QDs on a quartz slice surface, and SEM images of self-assembled SnO2 QDs with various 2D patterns on silicon-wafer surfaces. This material is available free of charge via the Internet at

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