Detection of environmental nanoplastics via surface-enhanced Raman spectroscopy using high-density, ring-shaped nanogap arrays

Frontiers in Bioengineering and Biotechnology

Bioengineering and Biotechnology

Junjie Zhang¹  Sihai Luo²  John C. de Mello³ 

[1] Department of Chemistry, Norwegian University of Science and Technology (NTNU), Trondheim, Norway;[e-mail];null;

关键词: nanoplastics;    microplastics;    surface-enhanced Raman spectroscopy;    lithography;    plasmonics;   

DOI  :  10.3389/fbioe.2023.1242797

 received in 2023-06-19, accepted in 2023-10-02,  发布年份 2023

来源: Frontiers

【 摘 要 】

Micro- and nano-plastics (MNPs) are global contaminants of growing concern to the ecosystem and human health. In-the-field detection and identification of environmental micro- and nano-plastics (e-MNPs) is critical for monitoring the spread and effects of e-MNPs but is challenging due to the dearth of suitable analytical techniques, especially in the sub-micron size range. Here we show that thin gold films patterned with a dense, hexagonal array of ring-shaped nanogaps (RSNs) can be used as active substrates for the sensitive detection of micro- and nano-plastics by surface-enhanced Raman spectroscopy (SERS), requiring only small sample volumes and no significant sample preparation. By drop-casting 0.2-μL aqueous test samples onto the SERS substrates, 50-nm polystyrene (PS) nanoparticles could be determined via Raman spectroscopy at concentrations down to 1 μg/mL. The substrates were successfully applied to the detection and identification of ∼100-nm polypropylene e-MNPs in filtered drinking water and ∼100-nm polyethylene terephthalate (PET) e-MNPs in filtered wash-water from a freshly cleaned PET-based infant feeding bottle.

【 授权许可】

Unknown   
Copyright © 2023 Luo, Zhang and de Mello.