Abstract
The self-organization of monolayer gold nanoparticles (AuNPs) on 3-aminopropyltriethoxysilane (APTES)-functionalized glass substrate is reported. The orientation of APTES molecules on glass substrates plays an important role in the interaction between AuNPs and APTES molecules on the glass substrates. Different orientations of APTES affect the self-organization of AuNps on APTES-functionalized glass substrates. The as grown monolayers and films annealed in ultrahigh vacuum and air (600 °C) were studied by water contact angle measurements, atomic force microscopy, X-ray photoelectron spectroscopy, UV–visible spectroscopy and ultraviolet photoelectron spectroscopy. Results of this study are fundamentally important and also can be applied for designing and modelling of surface plasmon resonance based sensor applications.
Highlights
Molecular self-assembly or self-organization is a technique which is widely used for the spontaneous arrangement of nanomaterials
Namely C 1s peaks that can be assigned to C–C at 284.4 eV, C–N at 286.2 eV and C=O at 288 eV, respectively, are observed. All these signals clearly point to the presence of APTES (C9H23NO3Si) on the glass substrates as it is confirmed with the presence of N 1s peak (Figure 1c)
A peak arising at 399.9 eV can be attributed to amine groups while the peak at 401.9 eV can be assigned to the protonated amines (Figure 1c) [24]
Summary
Molecular self-assembly or self-organization is a technique which is widely used for the spontaneous arrangement of nanomaterials. NH2-terminated silanized glass (Figure 2, type IV) surfaces could lead to large amount of AuNPs attached to the amine groups through electrostatic interaction as shown in sample 3.
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