Green chemistry breakthrough: Microwave-assisted synthesis of biomass-derived N-doped carbon dots for metal ion sensing
Peer-Reviewed Publication
Updates every hour. Last Updated: 30-Dec-2025 10:11 ET (30-Dec-2025 15:11 GMT/UTC)
In the quest for sustainable and efficient methods to detect heavy metals in the environment, a new study titled "Microwave-Assisted Synthesis of Biomass-Derived N-Doped Carbon Dots for Metal Ion Sensing" offers a promising solution. This research explores the innovative use of microwave-assisted synthesis to create nitrogen-doped carbon dots from biomass, providing a green and effective approach to metal ion sensing.
Recently, the team of Academician Xiaojun Peng from Dalian University of Technology, Associate Professor Haidong Li, and the team of Professor Juyoung Yoon from Ewha Womans University, South Korea cooperated to develop a series of near-infrared (NIR) dyes with aggregation-induced emission (AIE) characteristics, based on an electron-acceptor engineering strategy to regulate the excited-state dynamic processes of dyes. By introducing diphenylamine into the xanthene structural unit, due to the increase in freely rotatable single bonds and asymmetric structures, the dyes exhibited enhanced AIE characteristics as well as potential for photodynamic therapy (PDT), photothermal therapy (PTT), and photoacoustic imaging (PAI). Variation in the number of cyano groups within the dyes could regulate their excitation wavelength, PDT efficacy, and PTT capability. Experimental results showed that Hcy-ON displayed high ROS production and heat-generating capacity under 760 nm laser irradiation. Molecular theoretical calculations indicated that Hcy-ON exhibited a significant spin–orbit coupling matrix element (SOCME) value <S1|SOC|T3>, with the minimum energy gap between S1 and T1 energy levels being 0.678 eV, which is related to its strongest ROS generation capability. In addition, analyses of the singlet–triplet (S–T) energy gap, electron transition mechanism, root-mean-square displacement (RMSD) value, and Huang–Rhys factor confirmed the excellent photothermal performance of Hcy-ON. This strategy provides a new paradigm for constructing multimodal light-driven tumor therapies. This research work was published in CCS Chemistry.