Abstract
Plasmonic nanomaterials (P-NM) are receiving attention due to their excellent properties, which include surface-enhanced Raman scattering (SERS), localized surface plasmon resonance (LSPR) effects, plasmonic resonance energy transfer (PRET), and magneto optical (MO) effects. To obtain such plasmonic properties, many nanomaterials have been developed, including metal nanoparticles (MNP), bimetallic nanoparticles (bMNP), MNP-decorated carbon nanotubes, (MNP-CNT), and MNP-modified graphene (MNP-GRP). These P-NMs may eventually be applied to optical biosensing systems due to their unique properties. Here, probe biomolecules, such as antibodies (Ab), probe DNA, and probe aptamers, were modified on the surface of plasmonic materials by chemical conjugation and thiol chemistry. The optical property change in the plasmonic nanomaterials was monitored based on the interaction between the probe biomolecules and target virus. After bioconjugation, several optical properties, including fluorescence, plasmonic absorbance, and diffraction angle, were changed to detect the target biomolecules. This review describes several P-NMs as potential candidates of optical sensing platforms and introduces various applications in the optical biosensing field.
Highlights
Plasmon has an interesting property that occurs as an electron cloud on the surface of metallic nanomaterials [1,2,3]
The plasmonic effect induced by pi electrons has been discovered in carbon nanomaterials, such as graphene (GRP) and carbon nanotubes (CNT) [5,6,7,8]
Plasmonic properties can be tuned by interactions between plasmonic nanomaterials (P-NM) and shape control, controlling their optical properties to exhibit various colors [9,10,11,12,13]
Summary
Plasmon has an interesting property that occurs as an electron cloud on the surface of metallic nanomaterials [1,2,3]. To achieve an enhanced plasmonic effect, hybrid plasmonic nanomaterials have been developed, such as bimetallic NP (bMNP), core/shell MNP, MNP-decorated CNT (MNP-CNT), and MNP-modified GRP (MNP-GRP) [14,15,16,17] To prepare these P-NMs, various synthetic strategies have been suggested, such as chemical reduction processes, electrochemical deposition, microwave-assisted synthesis processes, photo-induced decoration processes, and environmentally friendly processes [18,19,20,21]. P-NMs have such optical properties, they areAttempts reported to have many the specificity of on-site detection andspecialized point-of-care diagnosis platforms. We introduce various P-NMs, such as MNPs, bMNPs, MNP-CNT, and MNP-GRP, RNA detection. We describe several P-NM-based optical biosensing systems that areof demonstrated
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