Knut Deppert
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View article: Dynamics of VLS-Grown Si Nanowires: Insights from Molecular Dynamics Simulations on Facet Evolution, Twinning, Nucleation, and Impurity Dynamics
Dynamics of VLS-Grown Si Nanowires: Insights from Molecular Dynamics Simulations on Facet Evolution, Twinning, Nucleation, and Impurity Dynamics Open
A clear understanding of the mechanisms governing the growth of nanowires is crucial to achieving control over their structures and properties. Here, we employ molecular dynamics (MD) simulations to investigate several important phenomena …
View article: A thermal evaporator for aerosol core-shell nanoparticle synthesis
A thermal evaporator for aerosol core-shell nanoparticle synthesis Open
Segregated bimetallic nanoparticles like core-shell nanoparticles are of interest in various fields including biomedicine, catalysis, and optoelectronics. Aerosol technology is an optimal platform to control nanoparticle size, structure, a…
View article: Insights into the Synthesis Mechanisms of Ag-Cu<sub>3</sub>P-GaP Multicomponent Nanoparticles
Insights into the Synthesis Mechanisms of Ag-Cu<sub>3</sub>P-GaP Multicomponent Nanoparticles Open
Metal-semiconductor nanoparticle heterostructures are exciting materials for photocatalytic applications. Phase and facet engineering are critical for designing highly efficient catalysts. Therefore, understanding processes occurring durin…
View article: On-line compositional measurements of AuAg aerosol nanoparticles generated by spark ablation using optical emission spectroscopy
On-line compositional measurements of AuAg aerosol nanoparticles generated by spark ablation using optical emission spectroscopy Open
Spark ablation is an established technique for generating aerosol nanoparticles. Recent demonstrations of compositional tuning of bimetallic aerosols have led to a demand for on-line stoichiometry measurements. In this work, we present a s…
View article: Quantitative laser diagnostics on trimethylindium pyrolysis and photolysis for functional nanoparticle growth
Quantitative laser diagnostics on trimethylindium pyrolysis and photolysis for functional nanoparticle growth Open
We report on an optical investigation of the pyrolysis and photolysis of trimethylindium (TMIn) as a typical metalorganic precursor for functional nanowire growth, aiming at an in-depth understanding of the governing chemistry and optimiza…
View article: Interface Dynamics in Ag–Cu<sub>3</sub>P Nanoparticle Heterostructures
Interface Dynamics in Ag–Cu<sub>3</sub>P Nanoparticle Heterostructures Open
Earth-abundant transition metal phosphides are promising materials for energy-related applications. Specifically, copper(I) phosphide is such a material and shows excellent photocatalytic activity. Currently, there are substantial research…
View article: Airborne Gold Nanoparticle Detection Using Photoluminescence Excited with a Continuous Wave Laser
Airborne Gold Nanoparticle Detection Using Photoluminescence Excited with a Continuous Wave Laser Open
We report the observation of photoluminescence emission from airborne gold, silver, and copper nanoparticles. A continuous wave 532 nm laser was employed for excitation. Photoluminescence from gold nanoparticles carried in a nitrogen gas f…
View article: Sintering Mechanism of Core@Shell Metal@Metal Oxide Nanoparticles
Sintering Mechanism of Core@Shell Metal@Metal Oxide Nanoparticles Open
Metal oxide shell layers are promising candidates to improve the performance of metal nanoparticles (NPs) in various applications. However, despite a significant amount of experimental work on metal@metal oxide (M@MO) NPs, computational mo…
View article: General Trends in Core–Shell Preferences for Bimetallic Nanoparticles
General Trends in Core–Shell Preferences for Bimetallic Nanoparticles Open
Surface segregation phenomena dictate core-shell preference of bimetallic nanoparticles and thus play a crucial role in the nanoparticle synthesis and applications. Although it is generally agreed that surface segregation depends on the co…
View article: Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces
Nanoparticle-Assisted Pool Boiling Heat Transfer on Micro-Pin-Fin Surfaces Open
Boiling heat transfer intensification is of significant relevance to energy conversion and various cooling processes. This study aimed to enhance the saturated pool boiling of FC-72 (a dielectric liquid) by surface modifications and explor…
View article: Continuous gas-phase synthesis of core–shell nanoparticles <i>via</i> surface segregation
Continuous gas-phase synthesis of core–shell nanoparticles <i>via</i> surface segregation Open
A continuous gas-phase synthesis method is employed to generate Cu@Ag core–shell nanoparticles with uniform size, composition, and bimetallic configuration. We discuss how the bimetallic morphology can also be tuned into a quasi-Janus stru…
View article: Aerotaxy: gas-phase epitaxy of quasi 1D nanostructures
Aerotaxy: gas-phase epitaxy of quasi 1D nanostructures Open
Cost- and resource-efficient growth is necessary for many applications of semiconductor nanowires. We here present the design, operational details and theory behind Aerotaxy, a scalable alternative technology for producing quality crystall…
View article: Controlled Oxidation and Self-Passivation of Bimetallic Magnetic FeCr and FeMn Aerosol Nanoparticles
Controlled Oxidation and Self-Passivation of Bimetallic Magnetic FeCr and FeMn Aerosol Nanoparticles Open
Nanoparticle generation by aerosol methods, particularly spark ablation, has high potential for creating new material combinations with tailored magnetic properties. By combining elements into complex alloyed nanoparticles and controlling …
View article: In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering
In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering Open
In-air epitaxy of nanostructures (Aerotaxy) has recently emerged as a viable route for fast, large-scale production. In this study, we use small-angle X-ray scattering to perform direct in-flight characterizations of the first step of this…
View article: Erratum to: In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering
Erratum to: In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering Open
The article In situ observation of synthesized nanoparticles in ultradilute aerosols via X-ray scattering, written by Sarah R. McKibbin, Sofie Yngman, Olivier Balmes, Bengt O. Meuller, Simon Tågerud, Maria E. Messing, Giuseppe Portale, Mic…
View article: <i>n</i>-type doping and morphology of GaAs nanowires in Aerotaxy
<i>n</i>-type doping and morphology of GaAs nanowires in Aerotaxy Open
Controlled doping in semiconductor nanowires modifies their electrical and optical properties, which are important for high efficiency optoelectronic devices. We have grown n-type (Sn) doped GaAs nanowires in Aerotaxy, a new continuous gas…
View article: Multiscale in modelling and validation for solar photovoltaics
Multiscale in modelling and validation for solar photovoltaics Open
Photovoltaics is amongst the most important technologies for renewable energy sources, and plays a key role in the development of a society with a smaller environmental footprint. Key parameters for solar cells are their energy conversion …
View article: From plasma to nanoparticles: optical and particle emission of a spark discharge generator
From plasma to nanoparticles: optical and particle emission of a spark discharge generator Open
The increased demand for high purity nanoparticles (NPs) of defined geometry necessitates the continuous development of generation routes. One of the most promising physical techniques for producing metal, semiconductor or alloy NPs in the…
View article: GaAsP Nanowires Grown by Aerotaxy
GaAsP Nanowires Grown by Aerotaxy Open
We have grown GaAsP nanowires with high optical and structural quality by Aerotaxy, a new continuous gas phase mass production process to grow III-V semiconductor based nanowires. By varying the PH3/AsH3 ratio and growth temperature, size …
View article: In-situ characterization of metal nanoparticles and their organic coatings using laser-vaporization aerosol mass spectrometry
In-situ characterization of metal nanoparticles and their organic coatings using laser-vaporization aerosol mass spectrometry Open
The development of methods to produce nanoparticles with unique properties via the aerosol route is progressing rapidly. Typical characterization techniques extract particles from the synthesis process for subsequent offline analysis, whic…
View article: Characteristics of airborne gold aggregates generated by spark discharge and high temperature evaporation furnace: Mass–mobility relationship and surface area
Characteristics of airborne gold aggregates generated by spark discharge and high temperature evaporation furnace: Mass–mobility relationship and surface area Open
The properties of gas-borne aggregates are important in nano-technology and for potential health effects. Gold aggregates from three generators (one commercial and one custom built spark discharge generator and one high-temperature furnace…