Inclusion of supported gold nanoparticles into their semiconductor support

Abstract

Supported particles are easily accessible as standard materials used in heterogeneous catalysis and photocatalysis. This article addresses our exemplary studies on the integration of supported nanoparticles into their solid support, namely gold nanoparticles into zinc oxide sub-micrometer spheres, by energy controlled pulsed laser melting in a free liquid jet. This one-step, continuous flow-through processing route reverses the educt's structure, converting the ligand-free surface adsorbate into a spherical subsurface solid inclusion within its former support. The results show how a nanoparticulate surface adsorbate can be included in the form of crystalline nanoparticles into the resolidified support matrix, demonstrated by using plasmonic nanoparticles and semiconductor microparticles as reference materials.

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

“…[24,34,251,252] The main goal is to understand and develop photon-induced defect formation strategies and understand how different types and densities of defect sites contribute to the catalytic activity in different reaction scenarios. Despite the studies on single crystalline oxide surfaces and bulk materials [253,254] as well as nanomaterials, [107,[255][256][257][258] no general mechanism on laser-based defect generation in the liquid is available to date. [34] From the present knowledge, the most important laser parameters determining defect formation in terms of electron excitation and occurring thermal stress during and after laser irradiation are: laser pulse duration, [259,260] laser fluence, [107] the particle mass-specific laser energy dose [107] and laser wavelength.…”

“…[34] From the present knowledge, the most important laser parameters determining defect formation in terms of electron excitation and occurring thermal stress during and after laser irradiation are: laser pulse duration, [259,260] laser fluence, [107] the particle mass-specific laser energy dose [107] and laser wavelength. [261] Additionally, intrinsic material properties like melting temperature (and enthalpy), electron-phonon relaxation time, the lifetime of excitons as well as optical properties like the absorption coefficient [256,257] and band gap [261] need to be considered.…”

Germanium Sub-Microspheres Synthesized by Picosecond Pulsed Laser Melting in Liquids: Educt Size Effects

“…As reported previously, a liquid jet reactor avoids any back-mixing so that intermediates of LML process are captured after a defined number of passages4658. After 10 passages, ~70% of small educts with sizes from 200~1000 nm are transformed into SMSs as depicted in Fig.…”

“…The experimental setup for ps laser fragmention in confined liquid flow has been described previously464758. A liquid passage reactor connected with a reservoir with diameter of 1.3 mm is used for our experiments.…”

High‐Purity Hybrid Organolead Halide Perovskite Nanoparticles Obtained by Pulsed‐Laser Irradiation in Liquid

“…[2,29,35] An excesso fs urfactants and alkylammonium halide is typically required to increaset he solubility of the intermediate metal-halide species. In recent years, PLIL has been successfully exploited to obtain metal, [41][42][43][44][45][46][47] oxide, [48][49][50] semiconductor, [51][52][53][54][55] and hybrid [56][57][58] nanostructures with high purity and controlled size, even at high pressure. [8,29,36] As demonstrated in recent studies, this synthetic approachs ometimes produces am ixture of HyP nanoparticles and nanoplatelets.…”