Open AccessRapid label-free SERS detection of foodborne pathogenic bacteria based on hafnium ditelluride-Au nanocomposites
Author(s) -
Yang Li,
Yanxian Guo,
Binggang Ye,
Zhengfei Zhuang,
Peilin Lan,
Yue Zhang,
Huiqing Zhong,
Hao Líu,
Zhouyi Guo,
Zhiming Liu
Publication year - 2020
Publication title -
journal of innovative optical health sciences/journal of innovation in optical health science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 24
eISSN - 1793-5458
pISSN - 1793-7205
DOI - 10.1142/s1793545820410047
Subject(s) - nanocomposite , detection limit , raman spectroscopy , raman scattering , nanomaterials , listeria monocytogenes , nanotechnology , nanoparticle , materials science , chemistry , colloidal gold , analyte , bacteria , chromatography , optics , physics , biology , genetics
Two-dimensional (2D) nanomaterials have captured an increasing attention in biophotonics owing to their excellent optical features. Herein, 2D hafnium ditelluride (HfTe[Formula: see text], a new member of transition metal tellurides, is exploited to support gold nanoparticles fabricating HfTe 2 -Au nanocomposites. The nanohybrids can serve as novel 2D surface-enhanced Raman scattering (SERS) substrate for the label-free detection of analyte with high sensitivity and reproducibility. Chemical mechanism originated from HfTe 2 nanosheets and the electromagnetic enhancement induced by the hot spots on the nanohybrids may largely contribute to the superior SERS effect of HfTe 2 -Au nanocomposites. Finally, HfTe 2 -Au nanocomposites are utilized for the label-free SERS analysis of foodborne pathogenic bacteria, which realize the rapid and ultrasensitive Raman test of Escherichia coli, Listeria monocytogenes, Staphylococcus aureus and Salmonella with the limit of detection of 10 CFU/mL and the maximum Raman enhancement factor up to [Formula: see text]. Combined with principal component analysis, HfTe 2 -Au-based SERS analysis also completes the bacterial classification without extra treatment.