Abstract
The study of carbon quantum dots used as either photoluminescence functional components or nano carriers for magnetic resonance-fluorescence multimodal molecular imaging probe is just beginning. In the paper,the gadopentetate monomeglumine was used as a precursor which provides simultaneously carbon sources and Gd3 +sources. The influences of pyrolysis temperature,holding time and heating rate on the carbonization degree of the precursor,the quantum yield and the Gd3 +content of the products were studied. When the precursor was pyrolized under reasonable condition( the pyrolysis temperature was not higher than 350 ℃),Gd3 +chelates dopped carbon quantum dots were facilely prepared. The carbon quantum dots not only possessing high luminous power( quantum yield ~ 7. 6%),but also showing good magnetic resonance response( longitudinal relaxation rate ~ 6. 5 mmol- 1·L·s- 1) can be used as a magnetic resonance /fluorescence multimodal molecular imaging probe.
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