Stabilization of mid-sized silicon nanoparticles by functionalization with acrylic acid

Abstract

We present an enhanced method to form stable dispersions of medium-sized silicon nanoparticles for solar cell applications by thermally induced grafting of acrylic acid to the nanoparticle surface. In order to confirm their covalent attachment on the silicon nanoparticles and to assess the quality of the functionalization, X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier spectroscopy measurements were carried out. The stability of the dispersion was elucidated by dynamic light scattering and Zeta-potential measurements, showing no sign of degradation for months.

A study of the role of polyacrylic acid in the surface modification of porous silicon with the aim of enhancing and stabilizing silicon photoluminescence

“…We note that these bands are located in close proximity to the absorption bands of C-H bonds in polyacrylic acid [9,10]. How ever, our previous studies [11,12] and the mechanism proposed in [13] to describe the interaction of silicon nanoparticles with polyacrylic acid, according to which the reaction of Si nanoparticles with the (CH 2 ⎯CH-COOH) n acid group leads to breakage of the CH 2 -CH bond in polyacrylic acid and the forma tion of Si-CH-COOH type compounds, suggest that a certain number of silicon-carbon bonds are formed on the surface of the porous silicon.…”

Exploring an alternative aqueous lubrication concept for biomedical applications: Hydration lubrication based on O/W emulsions combined with graphene oxide

“…5, two peaks located at 2959 and 1448 cm À 1 were observed in the pure PAA sample which can be assigned to the stretching and bending modes of CH 2 . The signals at 1701 and 1160 cm À 1 can be ascribed to the stretching modes of C ¼ O and C-O in COOH group, respectively [20,29]. For the spectrum of S21-PAA, the signals at 1700 cm À 1 can also be ascribed to the stretching modes of C=O and two peaks located at 2939 and 1447 cm À 1 can be assigned to the stretching and bending modes of CH 2 .…”

PEGylation of surfacted magnetite core–shell nanoparticles for biomedical application

“…2) shows three characteristic vibrations of the carboxylic groups: 1710 cm -1 (the C=O band of the nondissociated caboxlys), 1558 cm -1 (the asymmetric COO -vibration) and 1406 cm -1 (the symmetric COO -vibration of the dissociated carboxylates) [41,42]. Another well expressed peak at 1462 cm -1 is due to the scissoring bending mode of CH2 [43,44]. The latter is one of the a major identification bands of saturated hydrocarbons found in general near 1460 cm -1 [45].…”