论文部分内容阅读
Semiconductor nanocrystals(also known as quantum dots(QDs))are small nanoparticles with bulk-like crystalline structures with sizes that ranges from 2 nm to~10 nm(close to or smaller than the dimensions of exciton Bohr radius),containing roughly 200-10,000 atoms.These nanomaterials are novel fluorescent dyes which have attracted great attention in biomedical research areas in the past decades.However,fluorescent imaging has the following disadvantages: firstly,that there is strong background autofluorescence from ubiquitous endogenous chromophores and secondly,there is absorption and scattering of optical photons in tissues.