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

Kunjie Wang, Lei Liang, Jialin Xu, Hongxia Li, Mei Du, Xiaoliang Zhao, Deyi Zhang, Huixia Feng, and Haiyan Fan

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, China



Received: 22 April 2019  Accepted: 19 November 2019


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.

Keywords: Carbon quantum dots; Ag2S; Composite materials; Inhibition

Full paper is available at

DOI: 10.1007/s11696-019-01006-2


Chemical Papers 74 (5) 1517–1524 (2020)

Tuesday, August 11, 2020

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