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High Resolution, Single-Step Patterning of Silica AerogelsThree-dimensional metallic structures are fabricated with high spatial resolution in silica aerogels. In our method, silica hydrogels are prepared with a standard base-catalyzed route, and exchanged with an aqueous solution typically containing Ag' ions (1 M) and 2-propanol (0.2 M). The metal ions are reduced photolytically with a table-top ultraviolet lamp, or radiolytically, with a focused X-ray beam. We fabricated dots and lines as small as 30 x 70 km, protruding for several mm into the bulk of the materials. The hydrogels are eventually supercritically dried to yield aerogels, without any measurable change in the shape and spatial resolution of the lithographed structures. Transmission electron microscopy shows that illuminated regions are composed of Ag clusters with a size of several pm, separated by thin layers of silica.
Document ID
20030113008
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Bertino, M. F.
(Missouri Univ. Rolla, MO, United States)
Hund, J. F.
(Missouri Univ. Rolla, MO, United States)
Sosa, J.
(Missouri Univ. Rolla, MO, United States)
Zhang, G.
(Missouri Univ. Rolla, MO, United States)
Sotiriou-Leventis, C.
(Missouri Univ. Rolla, MO, United States)
Leventis, N.
(NASA Glenn Research Center Cleveland, OH, United States)
Tokuhiro, A. T.
(Missouri Univ. Rolla, MO, United States)
Terry, J.
(Notre Dame Univ. IN, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Metals And Metallic Materials
Distribution Limits
Public
Copyright
Public Use Permitted.
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