CDs data

Correspondence should be
addressed to Feng Feng; [e-mail] and Lizhen Liu; [e-mail]

In this article, a simple green approach
has been developed to synthesis highly fluorescent carbon dots (CDs) by simply mixing
L-aspartic acid and urea using the microwave heating method. The synthesized CDs
emits a strong fluorescence with a quantum yield of 16%. In addition, the obtained
CDs were characterized by transmission electron microscopy, fluorescence spectroscopy,
Ultraviolet–visible
absorption spectroscopy, Fourier transform infared spectroscopy and X–ray photoelectron spectroscopy. The
results indicate that the as-prepared CDs exhibit good spherical shape, excellent
dispersion of particles with an average size of about 5.0 nm, well water
solubility and high fluorescence stability. Furthermore, under optimum
conditions, the CDs exhibit good fluorescence response towards isorhamnetin (ISOR)
in a concentration range of 0.21–180
nM with a detection limit of 1.32 nM. The proposed method has been successfully
applied to detect ISOR in ginkgo biloba tablets medicines (tablet form) with a recovery
of 97.3% – 108.8%.