Radovanovic Pavle V, Norberg Nick S, McNally Kathryn E, Gamelin Daniel R
Department of Chemistry, Box 351700, University of Washington, Seattle, Washington 98195-1700, USA.
J Am Chem Soc. 2002 Dec 25;124(51):15192-3. doi: 10.1021/ja028416v.
Methods for introducing new magnetic, optical, electronic, photophysical, or photochemical properties to semiconductor nanocrystals are attracting intense applications-oriented interest. In this communication, we report the preparation and electronic absorption spectroscopy of colloidal ZnO DMS-QDs. Our synthetic procedure involves modification of literature methods known to yield highly crystalline and relatively monodisperse nanocrystals of pure ZnO to allow introduction of transition-metal dopants. We use ligand-field electronic absorption spectroscopy as a dopant-specific optical probe to monitor dopant incorporation during nanocrystal growth and to verify internal substitutional doping in Co2+:ZnO and Ni2+:ZnO DMS-QDs. To the best of our knowledge, these are the first free-standing oxide DMS-QDs reported. The synthesis of colloidal oxide DMS-QDs introduces a new category of magnetic semiconductor materials available for detailed physical study and application in nanotechnology.
将新的磁性、光学、电子、光物理或光化学性质引入半导体纳米晶体的方法正引起人们对面向应用的强烈兴趣。在本通讯中，我们报道了胶体ZnO DMS量子点的制备及电子吸收光谱。我们的合成方法涉及对文献中已知的制备高结晶度且相对单分散的纯ZnO纳米晶体的方法进行改进，以允许引入过渡金属掺杂剂。我们使用配体场电子吸收光谱作为特定于掺杂剂的光学探针，以监测纳米晶体生长过程中的掺杂剂掺入情况，并验证Co2+:ZnO和Ni2+:ZnO DMS量子点中的内部替代掺杂。据我们所知，这些是首次报道的独立氧化物DMS量子点。胶体氧化物DMS量子点的合成引入了一类新的磁性半导体材料，可用于纳米技术中的详细物理研究和应用。
