One-Step Synthesis of Nearly Monodisperse, Variable-Shaped In2O3 Nanocrystals in Long Chain Alcohol Solutions

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• 作者：Daniela Caruntu ; Kun Yao ; Zengxing Zhang ; Tabitha Austin ; Weilie Zhou ; Charles J. O&#8217 ; Connor
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：March 25, 2010
• 年：2010
• 卷：114
• 期：11
• 页码：4875-4886
• 全文大小：623K
• 年卷期：v.114,no.11(March 25, 2010)
• ISSN：1932-7455

文摘

Nearly monodisperse, variable-shaped In₂O₃ NCs have been synthesized from different indium−organic precursors in oleyl alcohol solutions at 320 °C under both nitrogen and air atmospheres. When indium(III) acetate (In(ac)₃) was employed as the metal precursor, spheroidal In₂O₃ NCs with an average diameter of 9.2 nm were obtained in a nitrogen atmosphere, whereas nanoparticles with an incompletely developed morphology were obtained under air. Cubic In₂O₃ NCs with sizes of about 7 and 20 nm were produced in an air atmosphere when indium(III) acetylacetonate (In(acac)₃) and indium(III) isopropoxide (In(OⁱPr)₃), respectively, were used as precursors. For the In₂O₃ NCs synthesized from In(ac)₃ and In(OⁱPr)₃, the influence of oxygen (air) on the growth kinetics as well as on the morphology of the resulting nanoparticles was also investigated. On the basis of the FT-IR studies of the postreaction solutions, different reaction mechanisms, depending on the nature of the metal precursor, were proposed. The variable-shaped In₂O₃ NCs showed relatively strong PL emissions at room temperature in the UV region. The spheroidal In₂O₃ NCs were used for the design of gas sensor devices that were able to detect concentrations of H₂S as low as 30 ppb at room temperature.