Nitrogen-doped carbon quantum dots from pumpkin for the sensing of nifuratel and temperature.

Herein, nitrogen doped carbon quantum dots (N-CQDs) were synthesized using a hydrothermal strategy. The raw materials for the preparation of N-CQDs were sourced from pumpkin and melamine. The N-CQDs suggested fascinating water solubility, favorable UV and salt resistance stability. The fluorescence quantum yield of N-CQDs was carried out to be 16.7 %. The prepared N-CQDs suggested good optical features and favorable blue fluorescence under a UV lamp (365 nm). The as-prepared N-CQDs could be employed as rapid, sensitive and promising fluorescence nanoprobes to detect nifuratel because of static quenching and inter filter effect. For nifuratel detection, the linear range of 0.5-100 μM and detection limit of 0.074 μM were obtained. Furthermore, N-CQDs were subsequently applied to determine nifuratel in river water and Yili milk samples with acceptable experiment results. Significantly, N-CQDs suggested evident temperature-sensitive characteristics and were employed as fluorescent temperature sensing nanoprobes.