半导体发光Ag_2S量子点合成及应用

Application and Synthesis of Silver Sulfide Quantum Dots

近年来窄带隙溶胶半导体纳米晶引起人们极大关注,该类纳米晶在光学、电学、生物医疗、材料科学等其他领域有着非常重要的应用.大量研究证实了Ag_2S量子点具有许多优异性能,比如:近红外荧光发射、低毒性、荧光量子效率高、稳定性好、成本低和合成设备简单.与传统的量子点(含有重金属Cd,Hg,Pb元素)相比,近红外发光的Ag_2S量子点避免了重金属离子本身固有的毒性,并且因其具有低毒性被用在生物医疗中.在本文中详细讨论了半导体发光Ag_2S量子点的性质、晶体结构和合成方法,并对Ag_2S量子点的生物相容性评价方法以及在生命科学领域的应用进行了阐述.

Narrow bandgap colloidal semiconductor nanocrystals have attracted increasing attention in recent years and studies have demonstrated their significant applications in optics, electronics, biomedicine, materials science, and other areas. Many studies have investigated colloidal Ag2S quantum dots （QDs） due to their numerous advantages, such as near-infrared （NIR） emission, low toxicity, high quantum yields, high photo-colloidal stability, low cost, and facile synthesis. Compared with conventional NIR QDs （which contain heavy metal elements such as Cd, Hg, or Pb）, NIR emissive Ag2S QDs avoid the intrinsic hazard of heavy metal ions in biomedical applications. In this paper, we discuss the nature, crystal structure and syn- thesis methods of the Ag2S quantum dots. Biocompatibility evaluation and application in the field of life sciences of the Ag2 S quantum dots are also described.