Assembly of citrate gold nanoparticles on hydrophilic monolayers
| Autor: | Willem M. Albers, Jouko Peltonen, Inger Vikholm-Lundin, Emil Rosqvist, Varpu Marjomäki, Tony Munter, Anni Honkimaa, Petri Ihalainen |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry General Physics and Astronomy Nanoparticle 02 engineering and technology Polyethylene glycol 010402 general chemistry 01 natural sciences Contact angle chemistry.chemical_compound hydrophilic monolayers Monolayer Hydroxymethyl atomic force microscopy (AFM) Surface plasmon resonance ta216 ta116 contact angle chemistry.chemical_classification ta114 ta1182 Surfaces and Interfaces General Chemistry Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Chemical engineering chemistry Colloidal gold gold nanoparticles 0210 nano-technology surface plasmon resonance (SPR) |
| Zdroj: | Vikholm-Lundin, I, Rosqvist, E, Ihalainen, P, Munter, T, Honkimaa, A, Marjomäki, V, Albers, W M & Peltonen, J 2016, ' Assembly of citrate gold nanoparticles on hydrophilic monolayers ', Applied Surface Science, vol. 378, pp. 519-529 . https://doi.org/10.1016/j.apsusc.2016.03.213 |
| Popis: | Self-assembled monolayers (SAMs) as model surfaces were linked onto planar gold films thorough lipoic acid or disulfide groups. The molecules used were polyethylene glycol (EG-S-S), N -[tris-(hydroxymethyl)methyl]acrylamide polymers with and without lipoic acid (Lipa-pTHMMAA and pTHMMAA) and a lipoic acid triazine derivative (Lipa-MF). All the layers, but Lipa-MF with a primary amino group were hydroxyl terminated. The layers were characterized by contact angle measurements and atomic force microscopy, AFM. Citrate stabilized nanoparticles, AuNPs in water and phosphate buffer were allowed to assemble on the layers for 10 min and the binding was followed in real-time with surface plasmon resonance, SPR. The SPR resonance curves were observed to shift to higher angles and become increasingly damped, while also the peaks strongly broaden when large nanoparticles assembled on the surface. Both the angular shift and the damping of the curve was largest for nanoparticles assembling on the EG-S-S monolayer. High amounts of particles were also assembled on the pTHMMAA layer without the lipoic acid group, but the damping of the curve was considerably lower with a more even distribution of the particles. Topographical images confirmed that the highest number of particles were assembled on the polyethylene glycol monolayer. By increasing the interaction time more particles could be assembled on the surface. |
| Databáze: | OpenAIRE |
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