Biocompatible rapid few-layers-graphene synthesis in aqueous lignin solutions

Carbon Trends

Andrea Lucotti¹  Luca Magagnin¹  Federico Lissandrello¹  Claudio Marchi¹  Konstantinos A. Sierros²  Harrison A. Loh² 

[1] Dipartimento di Chimica, Materiali e Ingegneria Chimica Giulio Natta, Politecnico di Milano, 20131 Milano, Italy;West Virginia University, Morgantown, West Virginia 26505-3847, United States;

关键词: Graphene;    Graphite;    Liquid Phase Exfoliation;    Ultrasounds;    Lignin;   

DOI  :  

来源: DOAJ

【 摘 要 】

Ultrasonic-Assisted Liquid Phase Exfoliation (UALPE) is considered one of the most promising approaches for the scale-up of graphene production. The process is based on the isolation and stabilization of layers of 2D materials, such as graphene: the selection of a proper stabilizing/exfoliating agent is crucial to achieve a stable Few-Layers-Graphene (FLG) dispersion. In the present work we propose the use of alkali lignin (AL) as a polymeric stabilizing agent for the rapid (≤ 3 hours) synthesis of FLG. Sonication time and graphite-to-lignin (Gr/AL) ratios were investigated as the primary operational parameters to identify the optimal working conditions. Spectroscopical characterization of the samples were employed to assess the quality of the synthesized material: the analysis of the Raman and XPS spectra provided insight on the number of layers and the nature of the limited defects introduced with the exfoliation procedure.Low-defectivity FLG was obtained at Gr/AL = 8 and a sonication time of 3 hours. Furthermore, Scanning Electron Microscopy and Dynamic Light Scattering were performed to investigate the size of the exfoliated flakes (∼ 400 nm). The procedure proposed represents a rapid route for the synthesis of FLG, which will be further explored for composites in chemiresistive devices.

【 授权许可】

Unknown