Advances in CoAPO-5 and SAPO-5 film fabrication for the templated catalytic growth of carbon nanotubes Michael Tsapatsis, Department of Chemical Engineering & Materials Science University of Minnesota, Twin Cities CoAPO-5 membranes synthesized on a porous support
Improved seeding of SAPO-5 on a silicon substrate
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Columnar seeds “broken” through sonication in acid
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Careful control of synthesis parameters yielded a well-intergrown and continuous film
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Particle width-to-thickness ratio is 2:1, preferred orientation occurs on the largest face
Rapid thermal processing experiments underway to improve membrane quality for nanotube growth
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Further experimental effort will focus on optimizing the seeded support procedure as well as hydrothermal film growth
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Cl
Cl
Si
Si
Functionalization with a silane coupling agent
O
Cl
O O O
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SAPO-5 seeds “rubbed” onto a sticky polymer layer with a high charge density
Si O
O
O
Spin coat polymer on the silicon surface
O O
Porous α-Al2O3 support Seed deposition by sonication between two glass slides
Silicon substrate 30 um
Hexagonal, platelike SAPO-5 seed particles rubbed onto the PEI layer
1 μm
O
O
Si
Si O
Hydrothermal growth under conditions that favor in-plane growth
O O O
O
Si O
O
O
O O
Further rubbing lowers multilayer attraction to the charged surface
In collaboration with Professor Avelino Corma, Instituto de Tecnología Química and Dr. George Karanikolos, National Center for Scientific Research, Demokritos UNIVERSITY OF MINNESOTA
Chemical Engineering & Materials Science
