Catalyst-Assisted Solution-Liquid-Solid Synthesis of CdS/CdSe Nanorod Heterostructures

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• 作者：Lian Ouyang ; Kristin N. Maher ; Chun Liang Yu ; Justin McCarty ; Hongkun Park
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：January 10, 2007
• 年：2007
• 卷：129
• 期：1
• 页码：133 - 138
• 全文大小：947K
• 年卷期：v.129,no.1(January 10, 2007)
• ISSN：1520-5126

文摘

We report the synthesis and characterization of axial nanorod heterostructures composed ofcadmium selenide (CdSe) and cadmium sulfide (CdS). The synthesis employs a solution-liquid-solid (SLS)mechanism with the assistance of bismuth nanocrystals adhered to a substrate (silicon or a III-Vsemiconductor). Transmission electron microscopy (TEM) and diffraction studies show that CdSe and CdSsegments exhibit the wurtzite (hexagonal) crystal structure with <5% stacking faults. Both of these segmentsgrow along the [002] direction with an epitaxial interface between them. Energy-dispersive X-ray (EDX)spectrometry using a high-resolution TEM operating in scanning mode confirms the alloy-free compositionmodulation in the nanorod heterostructures, showing that Se and S are localized in the CdSe and CdSportions of the nanorod heterostructures, respectively. This study demonstrates that SLS synthesis providesan alternate route to prepare axial nanorod heterostructures that have been difficult to generate usingeither vapor-liquid-solid growth or catalyst-free solution-phase synthesis.