1 research outputs found
Rapid Screening of Oxygen States in Carbon Quantum Dots by Chemiluminescence Probe
The
oxygen states (O-states) of carbon quantum dots (CDs) play
an important role, with regard to their optical properties and analytical
applications. However, the rapid screening of O-states in CDs is still
a great challenge, because of the complicated surface composition.
In this study, it is found that the chemiluminescence (CL) intensity
of prepared CDs in the presence of peroxynitrite (ONOO<sup>–</sup>) is proportional to the content of C–O group-related O-states.
The related mechanism discloses that the O-state-dependent CL is due
to the fact that abundant C–O functional groups in CDs with
high O-states could facilitate the electron transfer of the produced
smaller energy gaps for strong CL emission. Hence, ONOO<sup>–</sup>-induced CL can be utilized as a facile probe for the rapid screening
of O-states in CDs with some advantages, such as rapid response, low
cost, and easy operation. Its practicability is verified by detecting
the CL of phosphorus-doped CDs with variable phosphorus-doping contents.
The content of C–O group-related O-states in sulfur-/phosphorus-doped
CDs measured by the proposed CL probe is consistent with X-ray photoelectron
spectroscopy (XPS) characterization. This strategy can also be extended
to distinguish O-states in different types of nanoparticles by tuning
the CL probe molecules