Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

Abstract

Physicochemical analyses of Au nanoparticle monolayer formation on a glass surface functionalized with 3-aminopropyltrimethoxysilane (APTMS) and ethyltrimethoxysilane (ETMS) were performed for fabricating a nanoarchitecture of metal nanoparticles using self-assembly. The Au nanoparticle surface density on the functionalized glass surface correlated linearly with the optical response because of Au-nanoparticle localized surface plasmon resonance (LSPR). This relation enabled assessment of the Au nanoparticle deposition. A Frumkin isotherm showed the deposition of Au nanoparticles on the APTMS or APTMS/ETMS functionalized glass surface. For an APTMS-derivatized surface, the affinity between the Au nanoparticles and the surface decreased with the lowering of the APTMS surface coverage. The interaction parameter exhibited attractive interaction of 30-nm-diameter Au nanoparticles; 12 nm particles were repulsive. Adsorption isotherm experiments using Au nanoparticles on glass surfaces with an APTMS and ETMS mixed layer suggest that hydrophobic interaction between Au nanoparticles' bare gold surfaces caused the attractive interaction among 30-nm-diameter nanoparticles.

Surface Interactions between Gold Nanoparticles and Biochar

“…Surface carboxyl as well as the aromatic carbon are likely to be responsible for overcoming the charge repulsion to retain nAu in the following order at pH 3: PS300 > PS700 > PS500 ≈ soil. Extremely high retention (>22 mg g −1 ) of nAu by biochars is remarkable, considering minimal retention of nAu on hydroxyl-bearing granite 39 , sand 54 , clay 40 , and glass 55 surfaces, unless specifically functionalize to bear the positive charge. Charge transfer and van der Waals involving polyaromatic sheets are likely to be the driving force of attractive interactions, especially for PS700 having the highest aromaticity (lowest H/C in Table S1).…”

Aggregate Domain Growth of Gold Nanoparticle on Chemically Modified Glass Surface

“…7 The obtained value is expected for the particle diameter of about 45 nm, 14 although the diameter cannot be precisely determined from the transmission spectrum. The average diameter of AuNP used in this study was determined by AFM image 15 (different from indicated in Fig.…”

“…[11][12][13] In addition, our previous report revealed that very high affinity between AuNP and a glass surface modified by 3-aminopropyltrimethoxysilane (APTMS), and an attractive interaction of inter-nanoparticles. 14 In this study, we investigated the aggregate formation of AuNPon a APTMS modified glass surface by UV-vis spectroscopy and atomic force microscopy (AFM). The results show the local three-dimensional growth of AuNP aggregate.…”

“…Adsorbed AuNPs were homogeneously positioned, except a pyramidal aggregate domain structure. The aggregate consists of AuNP should begenerated by hydrophobic attractive force, 14 and grown vertical to the substrate. It is suggested that the aggregate domain grows from the aggregate seed, resemble with crystal growth.…”

Chemical approach to fabrication of semicontinuous Au nanolayers for SERS applications

“…1. The microscope glass slides were cleaned in base piranha (NH 4 OH:H 2 O 2 3:1) and functionalized with 0.3mM (3-aminopropyl) trimethoxysilane (APTMS, Sigma Aldrich) in toluene at 100°C for 1 hour [14]. The NH 2 -functionalized slides were rinsed with ethanol and water and placed in a solution of gold nanoparticles (AuNPs) prepared by using Turkevich method for 12 hours (sample A in Fig.…”