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Daniel A Fischer

Research Interests

Developing and exploiting new experimental methods, detectors, and physics approaches in synchrotron materials science to study the structure and chemical nature of diverse materials, in partnership with Industry, National Labs, and University researchers. In particular for soft x-ray absorption spectroscopy developing specialized electron and fluorescence yield detectors; emphasizing imaging and high-throughput to measure structure and chemistry: (1) on the scale ranging from atomic to tens of nanometers, particularly for low concentrations of materials; (2) at the surface of individual nanoscale entities such as nanotubes and nanoparticles; (3) at specific locations; e.g., an interface in a multilayer device; and (4) under relevant conditions, e.g., temperature and pressure, that the material will be subjected to in use. Materials currently under investigation include organic and inorganic electronics, model catalyst systems, polymer surfaces and their interfaces, hard disk lubricant chemistry, self-assembled monolayers, and high temperature superconductors.

Fischer Figure 1
Figure 1: Near Edge X-ray Absorption Fine Structure was used to investigate the chemical bonding mechanism of a Ti oil additive (10 ppm) with the metal surface of actual rocker arms from the engine tests. Results enable us to postulate that Ti provides anti-wear enhancement through the formation of FeTiO3 on the engine surface.
 

 

Fischer Figure 2
Figure 2: Focusing multi-layer wavelength dispersive carbon fluorescence detector for nearly background free soft x-ray absorption spectroscopy of insitu reaction intermediates inside working catalysts.

 

 

Fischer Figure 3
Figure 3: Near Edge X-ray Absorption Fine Structure was used to establish structure (molecular orientation, chemistry, and coverage) function (carrier mobility) in organic semiconductors as a function of thermal processing for rational material optimization.

 


Postdoctoral Research Opportunities in My Group:

We have developed synchrotron based spectroscopy methods to enable the development and optimization of materials for microelectronics, catalysis, homeland security, and energy. Materials that can be investigated include monolayers to bulk materials of all classes. Examples of ongoing measurement studies include (1) structure function relationships in organic semiconductors and photovoltaics, (2) development of full field large area imaging for soft x-ray absorption, (3) chemistry and bonding at semiconductor oxide interfaces, (4) dopant activation, (5) high-k gate dielectrics; and (6) phase change materials. Such measurement studies offer the opportunity to develop and utilize world class x-ray instrumentation and detectors.

Awards and Honors

  • User Executive Committee, Chair, Vice-chair, and Member, National Synchrotron Light Source, 2001-present
  • Editorial Board Member- Review of Scientific Instruments, 2005-present
  • Arthur S. Fleming Award (Scientific Category), 2005
  • Gold Medal Award, U.S. Dept. of Commerce, 2004
  • Bronze Medal Award, U.S. Dept. of Commerce, 1998
  • Bronze Medal Award, U.S. Dept. of Commerce, 1994

Publications

A practical superconducting-microcalorimeter X-ray spectrometer for beamline and laboratory science

Author(s)
William B. Doriese, Peter Abbamonte, Douglas A. Bennett, Edward V. Denison, Yizhi Fang, Daniel A. Fischer, Colin P. Fitzgerald, Joseph W. Fowler, Johnathon D. Gard, Gene C. Hilton, Cherno Jaye, Jessica L. McChesney, Luis Miaja Avila, Kelsey M. Morgan, Young Il Joe, Galen C. O'Neil, Carl D. Reintsema, Fanny Rodolakis, Daniel R. Schmidt, Hideyuki Tatsuno, Jens Uhlig, Leila R. Vale, Joel N. Ullom, Daniel S. Swetz
We describe a series of microcalorimeter X-ray spectrometers designed for a broad suite of measurement applications. The chief advantage of this type of

Microcalorimeter Spectroscopy at High Pulse Rates: a Multi-Pulse Fitting Technique

Author(s)
Joseph W. Fowler, Bradley K. Alpert, William B. Doriese, Young Il Joe, Galen C. O'Neil, Cherno Jaye, Joel N. Ullom, Daniel A. Fischer, Daniel S. Swetz
Transition edge sensor microcalorimeters can measure x-ray and gamma-ray energies with very high energy resolution and high photon-collection efficiency. For

Dry graphene transfer print to polystyrene and ultra-high molecular weight polyethylene ¿ detailed chemical, structural, morphological and electrical characterization

Author(s)
Evegeniya Lock, Dean M. DeLongchamp, Scott Schmucker, Blake Simpkins, Matthew Laskoski, Shawn Mulvaney, Daniel R. Hines, Mira Baraket, Sandra Hernandez, Jeremy Robinson, Paul Sheehan, Cherno Jaye, Daniel A. Fischer, Scott Walton
In this paper we apply a transfer print approach that relies on differential adhesion to remove graphene from Cu foil to polystyrene (PS) and ultra-high

High-resolution X-ray emission spectroscopy with transition-edge sensors: present performance and future potential

Author(s)
William B. Doriese, Joseph W. Fowler, Daniel S. Swetz, Cherno Jaye, Daniel A. Fischer, Carl D. Reintsema, Douglas A. Bennett, Leila R. Vale, Gene C. Hilton, Daniel R. Schmidt, Joel N. Ullom, Jens Uhlig, Ujjwal Mandal, Galen C. O'Neil, Luis Miaja Avila, Young Il Joe, wilfrid fullagar, Fredrick P. Gustafsson, Dharma Kurunthu, Villy Sundstrom
X-ray emission spectroscopy (XES) is a powerful element-selective tool to analyze the oxidation states of atoms in complex compounds, determine their electronic
Created August 15, 2019, Updated November 14, 2019