Synthesis and bacterial inhibition of novel Ag2S–N–CQD composite material

  • Kunjie WangEmail author
  • Lei Liang
  • Jialin Xu
  • Hongxia Li
  • Mei Du
  • Xiaoliang Zhao
  • Deyi Zhang
  • Huixia Feng
  • Haiyan FanEmail author
Original Paper


The present work aims to combine carbon quantum dots (CQDs) with the good water solubility, biocompatibility, and low toxicity and nano-sized silver sulfide with excellent antibacterial effect in the synthesized composite. The composite was further treated with polyethyleneimine (PEI) and conjugated with graphene oxide (GO). The as-prepared composite Ag2S–CQDs–PEI–GO exhibits a core of Ag2S with the size of 20–50 nm and the shell of CQDs with the average particle size of 1.8 nm. The core shell structure is loaded on the template of PEI–GO. Strong antibacterial effect was observed on Ag2S–CQDs composite against four strands of bacteria Staphylococcus aureus (S. aureus), Escherichia coli (E. coli), Enterococcus faecalis (E. faecalis), and Pseudomonas aeruginosa (P. aeruginosa). We briefly discussed the bacteriostatic mechanism of the composite. The as-prepared composite has huge potential in the development of biomedicine.


Carbon quantum dots Ag2Composite materials Inhibition 



We appreciate the financial support from the National Natural Science Foundation of China Project (21867015; 31860250). This work is also supported by The Foundation of Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education.


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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  1. 1.College of Petrochemical TechnologyLanzhou University of TechnologyLanzhouChina
  2. 2.School of Science and TechnologyNazarbayev UniversityAstanaKazakhstan
  3. 3.Key Laboratory of Eco-functional Polymer Materials of the Ministry of EducationNorthwest Normal UniversityLanzhouChina

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