水热合成CdS纳米晶体的形貌控制研究

研究了水热合成CdS纳米晶体形貌的化学控制，选择不同的络合试剂为模板,研究其对水热合成CdS纳米晶体形貌的影响.实验发现若以络合试剂乙二胺、甲胺为模板时，产品CdS晶体的形貌分别为（20～30） nm×（200～600） nm和（40～50） nm×（200～600） nm尺寸的纳米棒;而以络合试剂吡啶、 氨为模板时，产品CdS晶体的形貌分别为平均尺寸约30 nm和20 nm的纳米颗粒.用XRD、TEM、XPS、PL和Raman光谱等技术对所得CdS纳米棒进行了表征.同时对水热合成CdS纳米晶体形貌的模板控制机制进行了探讨，提出了一种水热合成CdS纳米棒的络合物结构诱导生长机理.

Study on the Morphology Control of CdS Nanocrystals Synthesized by Hydrothermal Method

Chemical controlling the morphology of the CdS nanocrystals fabricated by hydrothermal method was studied. Different coordination agents were chosen as templates to test their effects on the shape of the produced CdS nanocrystals. It was found that when ethylenediamine or methylamine was employed as the template, CdS nanocrystals display rod-like shapes with a dimension of （20～30）nm×（200～600） nm and （40～50） nm×（200～600） nm, respectively. In contrary, only particles of CdS nanocrystals with an average size of about 30 nm or 20 nm were observed if pyridine or ammonia was used. XRD、TEM、PL(photoluminescence)、Raman spectroscopy and XPS techniques were used to characterize the as produced CdS nanocrystals. Our experimental results suggested that bidentate ligands and high stability constant of the template complex might not be the only critical factors to the growth of CdS nanorods. A complex structure induced growth mechanism was proposed to explain the morphology control of CdS nanocrystals in hydrothermal synthesis.