One chemical reagent, hydrazine hydrate, was discovered to accelerate the growth of semiconductor nanocrystals (cadmium telluride) instead of additional energy, which was applied to the synthesis of high-quality CdTe nanocrystals at room temperature and ambient conditions within several hours. Under this mild condition the mercapto stabilizers were not destroyed, and they guaranteed CdTe nanocrystal particle sizes with narrow and uniform distribution over the largest possible range. The CdTe nanocrystals (photoluminescence emission range of 530-660 nm) synthesized in this way had very good spectral properties; for instance, they showed high photoluminescence quantum yield of up to 60%. Furthermore, we have succeeded in detecting the living Borrelia burgdorferi of Lyme disease by its photoluminescence image using CdTe nanocrystals.
A label-free electrochemical immunosensor
for cardiac troponin
I was prepared by using a helical carbon nanotube-supported aldehyde-functionalized
ionic liquid. Because of the good conductivity of ionic liquid and
helical carbon nanotubes, high sensitivity of the immunosensor was
obtained. Functionalized ionic liquid provided binding sites for antibody,
which simplified the process of sensor construction. Cardiac troponin
I was detected by this immunosensor with a linear range of 0.05–30
ng/mL and a detection limit of 0.03 ng/mL. The electrochemical immunosensor
had satisfactory reproducibility, high sensitivity, and acceptable
specificity.
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