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Search Publications by: Daniel A Fischer (Fed)

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Displaying 176 - 200 of 230

Combined NMR and XAS Study on Local Environments and Electronic Structures of the Electrochemically Li-Ion Deintercalated Li1-xCo1/3Ni1/3Mn1/302 Electrode System

January 1, 2004
Author(s)
W S. Yoon, C P. Grey, Mahalingam Balasubramanian, Xiao-Qing Yang, Daniel A. Fischer, James McBreen
Combined 6Li MAS NMR, in-situ metal K-edge (hard) XAS, and O K-edge (soft) XAS have been carried out during the first charging process for the layered Li1-xCo1/3Ni1/3Mn1/3O2 cathode material. The 6Li MAS NMR results showed the prescence of Li in the Ni2+

Near Edge X-Ray Absorption Fine Structure Measurements of the Interface Between Bottom Anti-Reflective Coatings and a Model Deprotected Photoresist

December 1, 2003
Author(s)
E Jablonski, S Sambasivan, Daniel A. Fischer, Eric K. Lin, C Devadoss, R Puligadda
The interface between bottom anti-reflective coatings (BARCs) and a model deprotected photoresist, poly(4-hydroxystyrene) (PHS), was investigated using near edge x-ray absorption fine structure spectroscopy to identify mechanisms responsible for pattern

Microscopy and Spectroscopy of Lithium Nickel Oxide Based Particles Used in High-Power Lithium-Ion Cells

November 1, 2003
Author(s)
D Abraham, R D. Twesten, Mahalingam Balasubramanian, J Kropf, Daniel A. Fischer, James McBreen, I Petrov, K Amine
Structural and electronic investigations were conducted on lithium nickel oxide based particles used in positive electrodes of 18650-type high power lithium-ion cells. K-edge X-ray absorption spectroscopy (XAS) revealed trivalent Ni and Co ions in the bulk

A Direct Comparison of Surface and Bulk Chain-Relaxation in Polystyrene

September 1, 2003
Author(s)
Wen-Li Wu, S Sambasivan, C M. Wang, William E. Wallace, Jan Genzer, Daniel A. Fischer
Near-edge x-ray absorption fine structure (NEXAFS) spectroscopy was used to meausre simultaneously the relaxation rates of polystyrene (PS) molecules at the free surface and in the bulk. The samples were uniaxially stretched and annealed at temperatures

NEXAFS Measurements of the Surface Chemistry of Chemically Amplified Photoresists

September 1, 2003
Author(s)
E Jablonski, M Angelopoulos, H Ito, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, S Sambasivan, Daniel A. Fischer, Ronald L. Jones, Eric K. Lin, Wen-Li Wu, D L. Goldfarb, K Temple
Near edge x-ray absorption fine structure (NEXAFS) spectroscopy was used to quantify the surface composition profile (top 1 nm to 6 nm) of model chemically amplified photoresists with various photo-acid generators. These materials are prone to interfacial

Resonant Soft X-Ray Photofragmentation of Propane

July 1, 2003
Author(s)
William E. Wallace, Daniel A. Fischer
A comparison was made between the mass spectra of propane (CH6d3^CH 2CH 3) for resonant soft X-ray photofragmentation and electron-impact ionization. The soft X-ray photon energy was tuned to 287.7 eV to promote Auger relaxations from the C-H bonds (1s _>

Comparative Studies of MgB 2 /Mg Nano-Composites and Press-Sintered MgB 2 Pellets

June 1, 2003
Author(s)
Q Li, L Wu, Y Zhu, A R. Moodenbaugh, G Gu, M Suenaga, Z X. Ye, Daniel A. Fischer
We present our studies of superconducting and microstructural properties of bulk MgB 2/Mg nano-composites and press-sintered MgB 2. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB 2 grains connected by the well

Investigation of BARC-Resist Interfacial Interactions

June 1, 2003
Author(s)
C Devadoss, Yijun Wang, R Puligadda, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, E Jablonski, Daniel A. Fischer, S Sambasivan, Eric K. Lin, Wen-Li Wu
Results are reported from studies of (A) surface versus bulk chemistry of BARC materials as a function of cure temperature, (B) the dependence of the thickness and composition of the residual layer (resist material remaining on the surface of the BARC

X-Ray Absorption Spectroscopy to Probe Interfacial Issues in Photolithography

February 1, 2003
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Daniel A. Fischer, S Sambasivan, Eric K. Lin, Ronald L. Jones, Christopher Soles, Wen-Li Wu, D L. Goldfarb, M Angelopoulos
Control of the shape, critical dimension (CD), and roughness is critical for the fabrication of sub 100 nm features, where the CD and roughness budget are approaching the molecular dimension of the resist polymers1. Here we utilize near edge X-ray

Electron Energy Loss Spectroscopy of CeO 2 -x Nanoparticles

January 7, 2003
Author(s)
W Lijun, H J. Wiesmann, A R. Moodenbaugh, Daniel A. Fischer, Y Zhu, M Suenaga
ria has been widely studied due to its applications, such as a catalyst in vehicle emissions system and an electrolyte material in solid oxide fuel cells. Recently, it has been reported that CeO2-x nanoparticles exhibit lattice expansion and valence

Semifluorinated Aromatic Side-Group Polystyrene-Based Block Copolymers: Bulk Structure and Surface Orientation Studies

October 1, 2002
Author(s)
X Li, L Andruzzi, E Chiellini, Giancarlo Galli, Christopher K. Ober, A Hexemer, E K. Kramer, Daniel A. Fischer
Two families of narrow polydispersity poly(styrene)-based block copolymers bearing side groups containing both a phenyl ring and a para-linked semifluorinated side group were designed to produce stable low energy surfaces. The effects of the phenyl ring on

Fabricating Planar Nanoparticle Assemblies With Number Density Gradients

July 1, 2002
Author(s)
R R. Bhat, Daniel A. Fischer, Jan Genzer
We report on preparing assemblies of gold nanoparticles with continuous gradients in number density on flat silica-covered substrates. The methodology consists of: i) first forming a one dimensional molecular gradient of amino groups (-NH2) on the

Unraveling the Symmetry of the Hole States Near the Fermi Level in the MgB 2 Superconductor

June 1, 2002
Author(s)
Y Zhu, A R. Moodenbaugh, G Schneider, J W. Davenport, T Vogt, Q Li, G Gu, Daniel A. Fischer, J Tafto
We use x-ray absorption spectroscopy (XAS) and electron energy loss spectroscopy (EELS) to study the near edge fine structure at the K-edge of boron in the superconductor M gB 2. We observe in XAS a peak of width 0.6 eV at the threshold of this K-edge

Formation of Solid Electrolyte Interface on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study

May 3, 2002
Author(s)
Mahalingam Balasubramanian, James McBreen, Xiao-Qing Yang, H S. Lee, A R. Moodenbaugh, Daniel A. Fischer, Ziwen Fu, D Abraham
Lithium-ion batteries are promising candidates for hybrid electric vehicles (HEV). Batteries that exceed the requirements for HEV, as set by the Partnership for a New Generation of Vehicles (PNGV), have been designed and built. These batteries are based on

Probing Surface and Bulk Chemistry in Resist Films Using Near Edge X-Ray Absorption Fine Structure

May 1, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Ronald L. Jones, Eric K. Lin, Christopher Soles, Wen-Li Wu, Daniel A. Fischer, S Sambasivan, D L. Goldfarb, M Angelopoulos
Control of the shape, critical dimension (CD), and roughness is critical for the fabrication of sub 100 nm features, where the CD and roughness budget are approaching the molecular dimension of the resist polymers. One focus of our research is identifying
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