One-Pot Synthesis of Robust Core/Shell Gold Nanoparticles

Abstract

A one-pot synthesis of thermally stable core/shell gold nanoparticles (Au-NPs) was developed via surface-initiated atom transfer radical polymerization (ATRP) of n-butyl acrylate (BA) and a dimethacrylate-based cross-linker. The higher reactivity of the cross-linker enabled the formation of a thin cross-linked polymer shell around the surface of the Au-NP before the growth of linear polymer chains from the shell. The cross-linked polymer shell served as a robust protective layer, prevented the dissociation of linear polymer brushes from the surfaces of Au-NPs, and provided the Au-NPs excellent thermal stability at elevated temperature (e.g., 110 degrees C for 24 h). This synthetic method could be easily expanded for preparation of other types of inorganic/polymer nanocomposites with significantly improved stability.

Poly(acrylic acid) with disulfide bond for the elaboration of pH-responsive brush surfaces

“…For example, the synthesis of star or brush copolymers is more easily achieved by ATRP [3,[19][20][21]. As this polymerization technique allows for a wider range of accessible polymer architectures, it is expected to further expand the range of applications for smart surfaces [22,23]. For that reason, there is a strong interest in developing new ATRP methods for the 'grafting to' approach.…”

Design and fabrication of thermally stable nanoparticles for well‐defined nanocomposites

“…22 They synthesized the crosslinked polymeric shell by adding n-butyl acrylate (BA) monomer and ethylene glycol dimethacrylate (EGDMA) as a crosslinker via ATRP with initiator-modified Au NPs. The reactivity of BA monomer is much lower than that of the EGDMA crosslinker; therefore, the crosslinker was consumed faster than the monomer and was preferentially incorporated into the crosslinked shell.…”

“…In order to solve this issue, several approaches, such as an introduction of more than two thiol-anchoring groups at the polymer chain ends or the shell crosslinking of polymer micelles surrounding the Au NPs, have been proposed previously. [19][20][21][22] Nonetheless, these methods were limited by complicated fabrication steps or insufficient thermal stability of resulting NPs.…”

Dependence of the size of nanoparticles of lead sulfide PbS on the chemical affinity of its formation reaction

“…An alternative to organo metallic synthesis is an experimentally simpler synthe sis method called one pot method. This method is currently widely used in organic synthesis but is becoming more and more popular for synthesizing inorganic compounds in the nanocrystalline state, e.g., oxides [2], core@shell structures based on pure metals [3] and metal chalcogenides [4], and semicon ductor nanocrystals and quantum dots [5]. Among one pot methods is chemical condensation or chemi cal precipitation from solutions, by which nanoparti cles can be synthesized directly in the aqueous medium-this is a necessary condition of using these nanoparticles in biology and medicine.…”