Microwave-assisted aqueous synthesis of Mn-doped ZnS quantum dots and their room-temperature phosphorescence detection of indapamide

Abstract

Mn-doped ZnS quantum dots (QDs) prepared by a conventional aqueous synthetic method usually suffer from poor crystallinity and low quantum yield due to their relatively low reaction temperature. In this paper, high-quality Mn-doped ZnS QDs with long-lived emissions were prepared using a green and rapid microwave-assisted synthetic approach in an aqueous solution. The QDs were used for room-temperature phosphorescence (RTP) detection of indapamide with a detection limit of 0.89 μM, and the RTP intensity showed a good linear relationship with the concentration of indapamide in the range from 1.5 to 80 μM. The relative standard deviation for seven independent measurements of 10 μM indapamide was 3.4%, and the recovery ranged from 94% to 105%.