Journal of Innovative Optical Health Sciences, 2020, 13 (5): 2041004, Published Online: Oct. 29, 2020
Rapid label-free SERS detection of foodborne pathogenic bacteria based on hafnium ditelluride-Au nanocomposites
Two-dimensional nanomaterials hafnium ditelluride surface-enhanced Raman scattering foodborne pathogenic bacteria
Abstract
Two-dimensional (2D) nanomaterials have captured an increasing attention in biophotonics owing to their excellent optical features. Herein, 2D hafnium ditelluride (HfTe2), a new member of transition metal tellurides, is exploited to support gold nanoparticles fabricatingHfTe2-Au nanocomposites.The nanohybrids can serve as novel 2D surface-enhanced Raman scattering (SERS) substrate for the labelfree detection of analyte with high sensitivity and reproducibility. Chemical mechanism originated from HfTe2 nanosheets and the electromagnetic enhancement induced by the hot spots on the nanohybrids may largely contribute to the superior SERS effect of HfTe2-Au nanocomposites. Finally, HfTe2-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 maximumRaman enhancement factor up to 1.7 × 108.Combined with principal component analysis, HfTe2-Au-based SERS analysis also completes the bacterial classification without extra treatment.
Yang Li, Yanxian Guo, Binggang Ye, Zhengfei Zhuang, Peilin Lan, Yue Zhang, Huiqing Zhong, Hao Liu, Zhouyi Guo, Zhiming Liu. Rapid label-free SERS detection of foodborne pathogenic bacteria based on hafnium ditelluride-Au nanocomposites[J]. Journal of Innovative Optical Health Sciences, 2020, 13(5): 2041004.