Peapod Assemblies of Au and Au/Pt Nanoparticles Encapsulated within Hollow Silica Nanotubes

Abstract

Nanoparticle assemblies within hollow nanoshells represent versatile structures which enable efficient nanosystems with colligative properties of nanoparticles for a variety of applications. In this report, we present a simple and high yielding solution‐based synthetic strategy for peapod‐shaped Au nanoparticle assembly encapsulated within hollow silica nanotubes (pp multi‐Au@SiO2 NTs). One‐dimensional, [multiple Au nanodot] core–[silica] shell nanowires (multi‐Au@SiO2 NWs) are preferentially synthesized based on reverse microemulsion (water‐in‐oil) techniques. By thermal treatment of multi‐Au@SiO2 NWs in aqueous polyvinylpyrrolidone (PVP) solution, pp multi‐Au@SiO2 NTs can be successfully fabricated. Further growth of Pt on the Au nanoparticles in pp multi‐Au@SiO2 NTs can lead to the generation of [Au] core‐[Pt] shell (Au/Pt) nanoparticle assembly surrounded by silica nanotubes (pp multi‐Au/Pt@SiO2 NTs).

Microwave Synthetic Routes for Shape-Controlled Catalyst Nanoparticles and Nanocomposites

“…Controlling the placement and interaction of optically active NP arrays would drive the development of NPPs with tunable optical properties for applications in plasmonic waveguides and other 1D nano-optical devices [68]. Recent reports on templated growth describe more facile synthetic routes and increased yields [69,70].…”

1D confined materials synthesized via a coating method for thermal catalysis and energy storage applications

“…This is especially true for SiO 2 NT confined catalysts due to their high thermal stability and mechanical robustness. Additionally, the cheap cost and facile synthesis methods such as the coating method and self-assembly method 44 also promote their wide application for thermal catalysis, showing outstanding sintering resistance of the confined NPs. For instance, it has been demonstrated that strategies to restrict the growth of active Ni NPs of cheap Ni based catalysts under high temperature reaction conditions can enhance their carbon resistance thereby increasing their stability for the DRM reaction.…”

Hollow Silica Nanotubes for Space-Confined Synthesis of Noble Metal Nanorods and Nanopeapods

“…As such, hollow nanostructures hold great promise as nanocarriers for drugs, proteins, and gene delivery, , and as hosts for catalytic reactions. , So far, hollow nanostructures with different shapes, including spherical, planar, cubic, ellipsoidal, and tubular morphologies, as well as diverse chemical compositions such as polymers, carbons, ceramics, and metals, have been created . Among those hollow nanostructures, organo-silica hybrid nanotubes , with the well-controlled size of the cavity have attracted significant attention due to their synthetic ease, controlled aspect ratios, low cost, and most importantly, great applications in energy storage, biosensing, nanomedicine, and templating synthesis. , …”

“…2 Among those hollow nanostructures, organo-silica hybrid nanotubes 7,8 with the well-controlled size of the cavity have attracted significant attention due to their synthetic ease, 9 controlled aspect ratios, low cost, and most importantly, great applications in energy storage, 10 biosensing, 11 nanomedicine, 3 and templating synthesis. 12,13 Comparing to synthetic strategies for spherical hollow silica nanostructures, the approaches to produce hollow silica nanotubes (HSNTs) are relatively limited. 9,12 One early example used self-assembled micelles from a commercially available copolymer as soft templates.…”