Abstract:

The effect of formaldehyde on the quenching of quantum dots (QDs) was studied via fluorescence quenching. The quenching mechanism was a dynamic quenching process, which was proved by the quenching rate constant K_q=5.67×10¹¹ L/(mol·s) and UVVis absorption spectra. As a fluorescent probe, the quantum dots can be used to determine the concentration of formaldehyde, based on the linear relationship between the fluorescence intensity of CdTe QDs and the concentration of formaldehyde. Compared with spectrophotometry, this method can provide theoretical basis for developing a new type of formaldehyde fluophotodetector.

Key words: quantum dots (QDs), formaldehyde, spectrophotometry, fluorescence quenching, dynamic quenching