☆ 4.7 Article

Interface coordination achieving excellent optical properties of three-dimensional dendritic gold nanoparticles for immunochromatographic performance

CHEMICAL ENGINEERING JOURNAL (2023)

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CHEMICAL ENGINEERING JOURNAL

卷 455, 期 -, 页码 -

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ELSEVIER SCIENCE SA

DOI: 10.1016/j.cej.2022.140586

关键词

3D branched nanostructures; Black Au nanoparticles; Size; Immunochromatographic assay

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Engineering, Environmental Engineering, Chemical

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In this study, 3D dendritic gold nanoparticles (PDA-AuNPs) with high absorption and low scattering were prepared using dopamine as the reductant and polydopamine as the stabilizer. The concentrations of Au seed were regulated to precisely synthesize dendritic PDA-AuNPs with excellent solubility and broadband absorption. The ICA based on 170 nm PDA-AuNPs showed a detection limit of 200 CFU/mL, over 20 times lower than that of traditional AuNPs. PDA-AuNPs, as simple-to-prepare labeling materials with high optical performance, hold great promise in low-cost and high-performance immunochromatographic platforms.

The replacement of traditional 30 - 40 nm gold nanoparticles (AuNPs) by large-sized AuNPs can only limitedly improve the signal intensity of immunochromatographic assay (ICA) due to the conventional seed growth method which requires the perfect lattice matching of Au atom and Au seed to achieve layer-by-layer growth and obtain large-sized AuNP with low absorption and high scattering. In this study, dopamine was introduced to replace sodium citrate as the reductant and polydopamine (PDA) as the stabilizer to prepare 3D dendritic AuNPs (PDA-AuNPs) with high absorption and low scattering, which is crucial in enhancing the sensitivity of the ICA. The dendritic PDA-AuNPs with excellent solubility and broadband absorption at 40, 80, 110, 140, and 170 nm were precisely synthesized by regulating the concentrations of Au seed, and the effect of optical intensity and binding efficiency relative to particle size of PDA-AuNPs on the detection sensitivity of Escherichia coli O157:H7 was further analyzed. The ICA based on 170 nm PDA-AuNPs has the lowest detection limit of 200 CFU/mL, which is over 20 times lower than that of the traditional AuNPs. PDA-AuNPs, the simple-to-prepare labeling materials with high optical performance, show great promise in low-cost and high-performance immunochro-matographic platforms.

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Templated Out-of-Equilibrium Self-Assembly of Branched Au Nanoshells

Alessandro Marchetti, Alessandro Gori, Anna Maria Ferretti, Daniel Arenas Esteban, Sara Bals, Claudia Pigliacelli, Pierangelo Metrangolo

Summary: Finite 3D structures with controlled morphology can be achieved in the out-of-equilibrium self-assembly of Au NPs using a spherical peptide-gold superstructure (PAuSS) as a template, resulting in a transient 3D-branched Au-nanoshell (BAuNS) stabilized by sodium dodecyl sulphate (SDS). The BAuNS dismantles and regresses to PAuSS through equilibrium of SDS concentration gradient over time in the sample solution, causing NP disassembly. The assembly and disassembly of BAuNS promote temporary interparticle plasmonic coupling, enabling reversible and tunable changes in their plasmonic properties, which is highly desirable for the development of optoelectronic nanodevices.

SMALL (2023)