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A Comparative Study of the Effect of Gold Seed Particle Preparation Method on Nanowire Growth

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Nano Research 2010年第7期3卷 506-519页

作者： Maria E.Messing Karla Hillerich Jessica Bolinsson Kristian Storm Jonas Johansson Kimberly A.Dick knut deppert Solid State Physics Lund UniversityBox 118S-22100 LundSweden Polymer&Materials Chemistry Lund UniversityBox 124S-22100 LundSweden

Highly controlled particle-assisted growth of semiconductor nanowires has been performed for many years,and a number of novel nanowire-based devices have been *** control of the epitaxial growth is required to optimize the performance of devices,and gold seed particles are known to provide the most controlled *** nanowire growth from gold particles generated and deposited by various different methods has been reported,but no investigation has yet been performed to compare the effects of gold particle generation and deposition methods on nanowire *** this article we present a direct comparative study of the effect of the gold particle creation and deposition methods on nanowire growth characteristics and nanowire crystal structure,and investigate the limitations of the different generation and deposition methods used.

关键词： Nanowire growth nanoparticles gold epitaxy electron microscopy

In Situ Etching for Total Control Over Axial and Radial Nanowire Growth

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Nano Research 2010年第4期3卷 264-270页

作者： Magnus T.Borgström Jesper Wallentin Johanna Trägårdh Peter Ramvall Martin Ek LReine Wallenberg Lars Samuelson knut deppert Solid State Physics Lund UniversityBox 118S-22100LundSweden Polymer&Materials Chemistry/nCHREM Lund UniversityS-22100 LundSweden H.H.Wills Physics Laboratory University of BristolTyndall AvenueBristol BS81TLUnited Kingdom

We report a method using in situ etching to decouple the axial from the radial nanowire growth pathway,independent of other growth *** a wide range of growth parameters can be explored to improve the nanowire properties without concern of tapering or excess structural defects formed during radial *** demonstrate the method using etching by HCl during InP nanowire *** improved crystal quality of etched nanowires is indicated by strongly enhanced photoluminescence as compared to reference nanowires obtained without etching.

关键词： MOVPE nanowire growth in situ etching photoluminescence

Semiconductor nanostructures enabled by aerosol technology

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Frontiers of physics 2014年第3期9卷 398-418页

作者： Martin H. Magnusson B. Jonas Ohlsson Mikael T. Bjork Kimberly A. Dick Magnus T. Borgstrom knut deppert Lars Samuelson Solid State Physics Lund University Box 118 SE-22100 Lund Sweden Sol Voltaics AB Ideon Science Park Scheelevagen 17 SE-22370 Lund Sweden QuNano AB Ideon Science Park Scheelevaigen 17 SE-22370 Lund Sweden Center for Analysis and Synthesis Lund University Box 124 SE-22100 Lund Sweden

Aerosol technology provides efficient methods for producing nanoparticles with well-controlled composition and size distribution. This review provides an overview of methods and results obtained by using aerosol technology for producing nanostruetures for a variety of applications in semiconductor physics and device technology. Examples are given from： production of metal and metal alloy particles： semiconductor nanoparticles; semiconductor nanowires, grown both in the aerosol phase and on substrates; physics studies based on individual aerosol-generated devices; and large area deviees based on aerosol particles.

关键词： aerosol nanoparticle nanowire metal-organic vapor phase epitaxy (MOVPE) device physics light emitting diodes (LED) solar cell

In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering

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Nano Research 2019年第1期12卷 25-31页

作者： Sarah R.McKibbin Sofie Yngman Olivier Balmes Bengt O.Meuller Simon Tagerud Maria E.Messing Giuseppe Portale Michael Sztucki knut deppert Lars Samuelson Martin H.Magnusson Edvin Lundgren Anders Mikkelsen Department of Physics and Nanolund Lund UniversityBox 11822100 LundSweden MaxIV Laboratory Lund UniversityBox 11822100 LundSweden University of Groningen Zemike Institute for Advanced MaterialsNijenborgh 4NL-9747 AG GroningenThe Netherlands ESRF-The European Synchrotron CS 4022038043 Grenoble Cedex 9France

In-air epitaxy of nanostructures(Aerotaxy)has recently emerged as a viable route for fast,large-scale *** this study,we use small-a ngle X-ray scatteri ng to perform direct in-flight characterizati ons of the first step of this process,i.e.,the en gineered formatio n of Au and Pt aerosol nan oparticles by spark gen erati on in a flow of N2 *** represe nts a particular challe nge for characterizati on because the particle density can be extremely low in con trolled *** particles produced are exami ned duri ng producti on at operatio nal pressures close to atmospheric conditions and exhibit a log no rmal size distributi on ranging from *** Au and Pt particle productio n and detection are *** observe and characterize the nanoparticles at different stages of synthesis and extract the corresponding domi nant physical properties,in cludi ng the average particle diameter and sphericity,as in flue need by particle sintering and the prese nee of *** observe highly sorted and sin tered spherical Au nano particles at ultra-dilute concen tratio ns(<5×10^5 particles/cm^3)corresponding to a volume fraction below 3×10^-10,which is orders of magnitude below that of previously measured *** independently confirm an average particle radius of 25 nm via Guinier and Kratky plot *** study indicates that with high-intensity synchrotron beams and careful con sideratio n of backgro und removal,size and shape info rmati on can be obtai ned for extremely low particle concentrations with industrially relevant narrow size distributions.

关键词： aerosol nanoparticle synthesis in situ analysis small-angle X-ray scattering Aerotaxy

In-situ characterization of metal nanoparticles and their organic coatings using laser-vaporization aerosol mass spectrometry

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Nano Research 2015年第12期8卷 3780-3795页

作者： Patrik T. Nilsson Axel C. Eriksson Linus Ludvigsson Maria E. Messing Erik Z. Nordin Anders Gudmundsson Bengt O. Meuller knut deppert Edward C. Fortner Timothy B. Onasch Joakim H. Pagels Ergonomics and Aerosol Technology Lund University P.O. Box 118 Lund SE-22100 Sweden Nuclear Physics Lund University P.O. Box 118 LundSE-22100 Sweden Solid State Physics Lund University P.O. Box 118 Lund SE-22100 Sweden Synchrotron Radiation Research Lund University P.O. Box 118 Lund SE-22100 Sweden Aerodyne Research Inc. Billefica MA 01821-3976 USA

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 offiine analysis, which may alter the particle characteristics. In this work, we use laser-vaporization aerosol mass spectrometry （LV-AMS） with 70-eV electron ionization for real-time, in-situ nanoparticle characterization. The particle characteristics are examined for various aerosol synthesis methods, degrees of sintering, and for controlled condensation of organic material to simulate surface coating/functionalization. The LV-AMS is used to characterize several types of metal nanoparticles （Ag, Au, Pd, PdAg, Fe, Ni, and Cu）. The degree of oxidation of the Fe and Ni nanoparticles is found to increase with increased sintering temperature, while the surface organic-impurity content of the metal particles decreases with increased sintering temperature. For aggregate metal particles, the organic-impurity content is found to be similar to that of a monolayer. By comparing different equivalent-diameter measurements, we demonstrate that the LV-AMS can be used in tandem with a differential mobility analyzer to determine the compactness of synthesized metal particles, both during sintering and during material addition for surface functionalization. Further, materials supplied to the particle production line downstream of the particle generators are found to reach the generators as contaminants. The capacity for such in-situ observations is important, as it facilitates rapid response to undesired behavior within the particle production process. This study demonstrates the utility of real-time, in-situ aerosol mass spectrometric measurements to characterize metal nanoparticles obtained directly from the synthesis process line, including their chemical composition, shape, and contamination, providing the potential for effective optimization of process operating p

关键词： metal aeroso1 organic surface coating contamination morphology alloy spark discharge