Thus, it is of great interest to synthesize SnO2 nanocrystals with desired structure and morphology. Some studies have shown that many fundamental physical or chemical properties of semiconductor materials strongly depend on the size and morphology of the materials, which deﬁne their further applications. Thus, tin dioxide has attracted great attention for a long time.

Introduction As an important low-cost, n-type wide band gap (Eg ❃.6 ev, at 300 K) semiconductor, SnO2 is wellknown for its potential applications in transparent conductive electrodes lithium rechargeable batteries, dye-sensitized solar cells, ultrasensitive gas sensors and catalyst supports, due to its excellent physiochemical properties. Keywords: SnO2 Single-layered microspheres Flowerlike nanospheres Nanoparticles Crystal growthġ. These ﬂowerlike nanospheres with diameters of 0.5–1 mm are composed of SnO2 submicron rods with diameters of 200–300 nm. These single-layered hollow microspheres with diameters of 1–5 mm have a very thin shell thickness of about 200 nm. And it will be a ﬂowerlike nanosphere when molar ratio of SnCl4/NaOH is 1:8. When the molar ratio of SnCl4/NaOH is 1:6, the nanostructure of SnO2 turns out to be a single-layered hollow microsphere. The concentration of NaOH plays an important role in the formation of SnO2 nanostructure. SnO2 single-layered hollow microspheres and SnO2 ﬂowerlike nanospheres have been fabricated by one step template-free hydrothermal reaction with the help of PEG400. Materials Letters journal homepage: Synthesis of SnO2 single-layered hollow microspheres and ﬂowerlike nanospheres through a facile template-free hydrothermal method Xiaohong Zhang n, Mingxing Huang, Yingjie Qiao Institute of Structured-Function Integration Materials, Harbin Engineering University, Harbin 150001, ChinaĪrticle history: Received 29 October 2012 Accepted 29 December 2012 Available online 7 January 2013

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Sno2 core shell sncl4.5h2o