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Type Thevuthasan, S.; Kuchibhatla, Satyanarayana, V. N. T.; Adusumilli, P.; Olszta, M.; Arey, B.; Shutthanandan, V.; McKinely, J. P.; Wang, C. M.; Bruemmer, S.; Baer, D. R.; Prosa, T.; Ulfig, R.; Seidman, D.; Buxbaum, A.; Wang, Y. C.; Tessner, T.
  Publication Laser Assisted Atom Probe Tomography analysis of nanoscale, energy and environment related materials at EMSL Volume Abstract
Pages 2010
  Abstract Microscopy and Microanalysis  
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Abbreviated Series Title Increasing emphasis on materials with enhanced properties in various functional applications has provided an impetus to develop the tools that will help understand materials with increased spatial resolution, at larger field-of-view and enhanced sensitivity. Laser assisted atom probe tomography analysis fits these objectives well and provides 3D-chemical images. While the atom probe analysis has been used for a few decades, the development of laser pulsing has extended the scope of this technique from metals to semiconductors and very recently to the insulating materials such as bulk oxides. EMSL, a national scientific user facility of the DOE, is developing an atom probe tomography capability complimenting the existing surface and interfacial analysis, microscopy capabilities to provide solutions to various problems of interest to energy and environment, in particular, at the nanoscale. This presentation examines the feasibility of using atom probe for various challenging materials systems including some that have not been previously examined by atom probe methods. We report the first Local Electrode Atom Probe (LEAP®) analysis of Au nanoparticles embedded in MgO using ion beam synthesis method, in which, 2MeVAu ions were implanted in a MgO(100) substrate at various temperatures and the substrate was subsequently annealed at 1000oC for 10 hours in air. These samples were analyzed using a combination of atom probe tomography and analytical electron microscopy. Also analyzed for the first time, are the samples obtained from the reductive biotransformation of 6-line ferrihydrite located within porous silica (intragrain ferrihydrite) by Shewanella oneidensis MR-1. Imaging and analysis of biologically induced Fe- phosphate precipitates in porous silica using He-ion microscopy and atom probe tomography will be outlined. Selected results from EMSL user projects related to semiconductor and nuclear energy materials will also be discussed. Dopant distribution and the oxidation mechanisms will be predicted based on the atom probe analysis in these systems. Dual beam FIB/SEM systems at EMSL have been extensively used for sample preparations and some of the key observations during sample preparations will also be outlined in this presentation.
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no NU @ karnesky @ 10869
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