Assembly of gold nanoparticles using turnip yellow mosaic virus as an in-solution SERS sensor

Abstract

3D-assembly of gold nanoparticles onto turnip yellow mosaic virus.

Analysis of the plasmonic excitations in assemblies of three-dimensional electron clusters

“…3(h). The red-shift and broadening of the plasmon peak in the absorption spectra also has been observed in experiments of plasmonic NP arrangements [10][11][12][13]. The spectrum of Th1, however, supports a broad peak at 2.75 eV with a shoulder at approximately 2.5 eV.…”

“…Exact comparison to existing experiments is also hindered by the generally much larger size of the NPs and interparticle separations in the experimental plasmonic assemblies, such as those mentioned in the introduction, compared to the jellium arrangements studied here. Specifically, none of the articles [5][6][7][8][9][10][11][12][13] report CTPs, which require very small intercluster separations. So far, CTPs have not been observed for cluster systems with similar arrangements and cluster sizes as studied here.…”

“…Three-dimensional arrangements of plasmonic NPs can be assembled, for example, by using DNA templates [5,6], manipulation with atomic force microscope [7], tethering or coating the clusters with block copolymers [8][9][10], or using viruses or virus-like particles as templates [11][12][13]. The geometries achieved include among others spherical vesicles [10], tetrahedra [5][6][7][8][9], icosahedra [9,11], and other arrangements with fivefold symmetries [12,13].…”

“…One application for these plasmonic assemblies or "plasmonic molecules" is surface-enhanced Raman scattering (SERS). Via the creation of hot spots between the plasmonic NPs, these assemblies were found to enhance the signal compared to single NPs [8,10,12,13]. Pazos-Perez et al fabricated several 2D and 3D geometries of block copolymer-protected Au NPs using evaporation of emulsion droplets [8].…”

Silver Nanoparticles-Based SERS Platform towards Detecting Chloramphenicol and Amoxicillin: An Experimental Insight into the Role of HOMO–LUMO Energy Levels of the Analyte in the SERS Signal and Charge Transfer Process

“…5 Therefore, many studies have focused on designing and developing plasmonic NPs with sharp tips, such as nanostars, 6 nanodendrites, 7 nanotriangles, 8 NPs, such as nanocubes and nanowires, were also promising SERS substrates thanks to their potential of creating nanogaps via self-assembly. 9 These nanogaps could be created using polymer-assisted assembly, 10 DNA origami, 11 protein anchoring, 12 etc. On the other hand, researchers have also paid attention to improving the formation of molecule−metal complexes by modifying the NPs with capping agents allowing the binding of the desired analytes via electrostatic interaction, 13 steric effect, 14 host−guest interaction, 15 biological recognition, 16 etc.…”