Fabrication and characterization of concentric-tubular composite micro- and nanostructures using the template-synthesis
- PDF / 539,051 Bytes
- 11 Pages / 612 x 792 pts (letter) Page_size
- 79 Downloads / 280 Views
MATERIALS RESEARCH
Welcome
Comments
Help
Fabrication and characterization of concentric-tubular composite micro- and nanostructures using the template-synthesis method Veronica M. Cepak, John C. Hulteen, Guangli Che, Kshama B. Jirage, Brinda B. Lakshmi, Ellen R. Fisher, and Charles R. Martina) Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523 (Received 8 May 1997; accepted 23 March 1998)
The template-synthetic method is a general approach for preparing tubular microand nanostructures. This method has been used to prepare micro- and nanostructures composed of metals, carbons, semiconductors, polymers, and Li1 -intercalation materials. This paper describes the use of the template method to prepare composite tubular micro- and nanostructures. These composite structures consist of an outer tubule of one material surrounding inner tubules of different materials. Chemical strategies used to prepare these composite tubular structures include electroless deposition of Au, electropolymerization of conductive and insulating polymers, electrodeposition of metals and semiconductors, carbonization of polymer precursors, chemical vapor deposition synthesis, and sol-gel synthesis.
I. INTRODUCTION
We have been investigating a general method for preparing tubular micro- and nanostructures called template synthesis.1–4 This method entails synthesis of a desired material within the pores of a microporous membrane. The membranes employed have cylindrical pores with monodisperse diameters. A tubule or fibril of the desired material is obtained within each pore. We have recently become interested in the idea of making concentric composite micro- and nanostructures of this type.5 Such concentric tubular structures consist of an outer tubule of one material surrounding inner tubules of different materials. Such composites might have applications in microelectronics, chemical sensors, and electrochemical energy production. This paper describes synthetic strategies for preparing five different concentric-tubular micro- and nanostructures of this type. Synthetic methodologies used include electroless deposition of Au, electropolymerization of metals and semiconductors, carbonization of polymer precursors, chemical vapor deposition, and sol-gel synthesis. These methodologies were used to prepare composite tubules composed of metals, semiconductors, carbon, polymers, and Li1 -intercalating materials. II. MATERIALS
Polyester “track-etch” membranes with 1.0, 2.0, and 3.0 mm diameter pores were obtained from Poretics, and alumina membrane filters with 200 nm diameter a)
Address correspondence to this author. e-mail: [email protected]
3070
http://journals.cambridge.org
J. Mater. Res., Vol. 13, No. 11, Nov 1998
Downloaded: 15 Dec 2014
pores were obtained from Whatman. Reagents for the electroless deposition of Au were used as received and have been reported in prior publications.6,7 Milli Q 18-MV water was used for rinsing and for all aqueous solutions. Reagents used as received for the prepar
Data Loading...
