Nanocrystalline Metal Chalcogenides Obtained Open to Air: Synthesis, Morphology, Mechanism, and Optical Properties

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• 作者：Aiyu Zhang ; Qian Ma ; Mengkai Lu ; Guangjun Zhou ; Chunzhong Li ; Zhaoguang Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：September 3, 2009
• 年：2009
• 卷：113
• 期：35
• 页码：15492-15496
• 全文大小：280K
• 年卷期：v.113,no.35(September 3, 2009)
• ISSN：1932-7455

文摘

Nanocrystalline metal chalcogenide (selenide/sulfide/telluride) semiconductors make great sense in the photoelectric applications. Since the size and shape of the nanomaterials have a strong influence on their properties, new methods with high feasibility are always expected for the synthesis of chalcogenides with different dimension and morphology. In the present work, a green acetate−paraffin route was introduced that is suitable for the preparation of different chalcogenides, such as PbSe, Cu₂Se, ZnSe, CdSe, NiSe₂, CoSe, ZnS, Cu_7.2S₄, and PbTe. All the experiment processes were conducted open to air. These chalcogenides show various morphologies like grains, nanospheres, nanoplates, and so on. A mechanism was proposed to explain the formation of the different chalcogenide nanostructures. The dimension and shape of the nanostructures are dependent both on the crystal structure and the action of oleic acid on the growth rate of crystal faces. The optical properties of the prepared chalcogenides were characterized by the UV−visible diffuse reflectance spectroscopy (UV-DRS) and photoluminescence (PL) spectroscopy.