Dr. John A. Dagata Profile

Dr. John A. Dagata

at National Institute of Standards and Technology

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Publications (9)

Proceedings Article | 16 September 2014 Paper

Particle deformation induced by AFM tapping under different setpoint voltages

Chung-Lin Wu, Natalia Farkas, John Dagata, Bo-Ching He, Wei-En Fu

Proceedings Volume 9236, 92360W (2014) https://doi.org/10.1117/12.2070356

KEYWORDS: Nanoparticles, Atomic force microscopy, Gold, Particles, Mica, Nitrogen, Calibration, Standards development, Metrology, Data modeling

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Proceedings Article | 9 September 2008 Paper

Cellulose nanocrystals the next big nano-thing?

Michael Postek, Andras Vladar, John Dagata, Natalia Farkas, Bin Ming, Ronald Sabo, Theodore Wegner, James Beecher

Proceedings Volume 7042, 70420D (2008) https://doi.org/10.1117/12.797575

KEYWORDS: Nanocrystals, Manufacturing, Particles, Scanning probe microscopy, Nanomaterials, Scanning electron microscopy, Mica, Metrology, Nanoparticles, Polymers

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Biomass surrounds us from the smallest alga to the largest redwood tree. Even the largest trees owe their strength to a newly-appreciated class of nanomaterials known as cellulose nanocrystals (CNC). Cellulose, the world's most abundant natural, renewable, biodegradable polymer, occurs as whisker like microfibrils that are biosynthesized and deposited in plant material in a continuous fashion. Therefore, the basic raw materials for a future of new nanomaterials breakthroughs already abound in the environment and are available to be utilized in an array of future materials once the manufacturing processes and nanometrology are fully developed. This presentation will discuss some of the instrumentation, metrology and standards issues associated with nanomanufacturing of cellulose nanocrystals. The use of lignocellulosic fibers derived from sustainable, annually renewable resources as a reinforcing phase in polymeric matrix composites provides positive environmental benefits with respect to ultimate disposability and raw material use. Today we lack the essential metrology infrastructure that would enable the manufacture of nanotechnology-based products based on CNCs (or other new nanomaterial) to significantly impact the U.S. economy. The basic processes common to manufacturing - qualification of raw materials, continuous synthesis methods, process monitoring and control, in-line and off-line characterization of product for quality control purposes, validation by standard reference materials - are not generally in place for nanotechnology based products, and thus are barriers to innovation. One advantage presented by the study of CNCs is that, unlike other nanomaterials, at least, cellulose nanocrystal manufacturing is already a sustainable and viable bulk process. Literally tons of cellulose nanocrystals can be generated each day, producing other viable byproducts such as glucose (for alternative fuel) and gypsum (for buildings).There is an immediate need for the development of the basic manufacturing metrology infrastructure to implement fundamental best practices for manufacturing and in the determination of properties for these for nanoscale materials and the resultant products.

Proceedings Article | 22 August 2001 Paper

Electric force microscopy with a single carbon nanotube tip

John Dagata, F. Chien, S. Gwo, K. Morimoto, Takahito Inoue, J. Itoh, Hiroshi Yokoyama

Proceedings Volume 4344, (2001) https://doi.org/10.1117/12.436728

KEYWORDS: Silicon, Scanning probe microscopy, Microscopy, Carbon nanotubes, Capacitance, Semiconductors, Dielectrics, Lithography, Scanning electron microscopy, Standards development

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Proceedings Article | 1 November 1997 Paper

Applications of the rapidly renewable lap

Robert Parks, Christopher Evans, David Roderick, John Dagata

Proceedings Volume 3134, (1997) https://doi.org/10.1117/12.295130

KEYWORDS: Polishing, Diamond, Surface finishing, Silicon, Silicon carbide, Glasses, Silicon films, Foam, Aluminum, Iron

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Proceedings Article | 26 May 1994 Paper

Photoreflectance study of the chemically modified (100) GaAs surface

Orest Glembocki, Judah Ari Tuchman, K. Ko, Stella Pang, John Dagata, Adriana Giordana, R. Kaplan, Charles Stutz

Proceedings Volume 2141, (1994) https://doi.org/10.1117/12.176843

KEYWORDS: Gallium arsenide, Etching, Oxides, Gallium, Spectroscopy, Interfaces, Solar energy, Ions, Arsenic, Electrons

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Proceedings Article | 3 October 1993 Paper

Low voltage E-beam lithography with the STM

Christie Marrian, Elizabeth Dobisz, John Dagata

Proceedings Volume 10310, 1031005 (1993) https://doi.org/10.1117/12.183196

Proceedings Article | 3 October 1993 Paper

Scanning tunneling microscope-based fabrication and characteerization on passivated semiconductor surfaces

John Dagata, Jason Schneir

Proceedings Volume 10310, 1031007 (1993) https://doi.org/10.1117/12.183198

Proceedings Article | 3 October 1993 Paper

Technology of proximal probe lithography: an overview

John Dagata, Christie Marrian

Proceedings Volume 10310, 1031002 (1993) https://doi.org/10.1117/12.183184

Proceedings Article | 9 July 1992 Paper

Scanning tunneling microscope lithography: a viable lithographic technology?

Christie Marrian, Elizabeth Dobisz, John Dagata

Proceedings Volume 1671, (1992) https://doi.org/10.1117/12.136012

KEYWORDS: Scanning tunneling microscopy, Lithography, Electron beam lithography, Control systems, Silicon, Servomechanisms, Scanners, Microfabrication, Reactive ion etching, Oxides

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Showing 5 of 9 publications

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