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PFOA is a representative perfluorinated compound that is used as a surfactant in various industrial fields. However, because PFOA has severe side effects due to its strong toxicity, such as carcinogenesis, liver damage, and immune system damage, it is crucial to enable PFOA detection with high sensitivity. Herein, we developed a perfluorooctanoic acid (PFOA) surface-enhanced Raman scattering (SERS) sensor using self-assembled p-phenylenediamine (SAp-PD) nanoparticles and an Ag SERS substrate. Fo

In this study, we developed Nafion-blanketed bismuth nanoplates for the ultrasensitive detection of heavy metals in water. The Nafion-blanketing method was proposed owing to its selective adsorption of cadmium and lead ions. In addition, eco-friendly bismuth nanoplates can be facilely fabricated by irradiation with ultrasonic energy. The bismuth nanoplates were used as electrochemical sensors owing to their high affinity toward heavy-metal ions. The bismuth nanoplates exhibited an outstanding el

This paper presents a comprehensive investigation of the various parameters involved in the fabrication of a molecularly imprinted polymer (MIP) sensor for the detection of cortisol. Parameters such as monomer concentration, electropolymerization cycles, pH, monomer-template ratio, template removal technique, and rebinding time were optimized to establish a more consistent and effective method for the fabrication of MIP sensors. Under the optimized conditions, the MIP sensor demonstrated a propo

In the field of surface-enhanced Raman scattering (SERS) sensors, biomimetic micro/nanostructures have been fabricated to improve sensing performance. In this study, we developed a biomimetic nano-pine-pollen nanostructure (NPP-NS)-based SERS sensing platform that enables the hypersensitive detection of toxicants, such as toxic heavy metal ions and amyloid-β oligomers. The secondary gold nanostructures of NPP-NS were formed on the silver nanostructure through a galvanic replacement reaction, whi

Chlorpyrifos (CPF) is widely used as an organophosphorus insecticide; however, owing to developmental neurotoxicity, genotoxicity, and other adverse effects, it is harmful not only to livestock but also to humans. Therefore, the use of CPF was recently regulated, and its sensitive detection is crucial, as it causes serious toxicity, even in the case of residual pesticides. Because it is hard to detect the chlorpyrifos directly using spectroscopy (especially in SERS) without chemical reagents, we

The interplay between metal ions and amyloids plays a significant role not only in the pathogenesis of neurodegenerative disorders such as Alzheimer's and Parkinson's disease but also in the development of application technologies for the synthesis of metal nanomaterials. In this study, we investigate the interplay between amyloids and heavy metal ions using screen-printed electrochemical sensor functionalized with amyloid fibrils. For this purpose, amyloid fibril-functionalized screen-printed e