Nanoscale patterning of two metals on silicon surfaces using an ABC triblock copolymer template

Journal of the American Chemical Society
Masato Aizawa, Jillian M Buriak

Abstract

Patterning technologically important semiconductor interfaces with nanoscale metal films is important for applications such as metallic interconnects and sensing applications. Self-assembling block copolymer templates are utilized to pattern an aqueous metal reduction reaction, galvanic displacement, on silicon surfaces. Utilization of a triblock copolymer monolayer film, polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) (PS-b-P2VP-b-PEO), with two blocks capable of selective transport of different metal complexes to the surface (PEO and P2VP), allows for chemical discrimination and nanoscale patterning. Different regions of the self-assembled structure discriminate between metal complexes at the silicon surface, at which time they undergo the spontaneous reaction at the interface. Gold deposition from gold(III) compounds such as HAuCl4(aq) in the presence of hydrofluoric acid mirrors the parent block copolymer core structure, whereas silver deposition from Ag(I) salts such as AgNO3(aq) does the opposite, localizing exclusively under the corona. By carrying out gold deposition first and silver second, sub-100-nm gold features surrounded by silver films can be produced. The chemical selectivity was extended to o...Continue Reading

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Jun 9, 2011·Chemical Reviews·Matthew R JonesChad A Mirkin
May 7, 2011·ACS Nano·Xiaojiang ZhangJillian M Buriak
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Nov 26, 2010·ACS Applied Materials & Interfaces·Sayed Y Sayed, Jillian M Buriak

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