Localized, stepwise template growth of functional nanowires from an amino acid-supported framework in a microfluidic chip
Puigmarti-Luis, Josep (Institut de Ciència de Materials de Barcelona)
Rubio-Martínez, Marta (Institut Català de Nanociència i Nanotecnologia)
Imaz, Inhar (Institut Català de Nanociència i Nanotecnologia)
Cvetković, Benjamin Z. (Paul Scherrer Institut (Suïssa))
Abad, Llibertat (Institut de Microelectrònica de Barcelona)
Pérez del Pino, Ángel (Institut de Ciència de Materials de Barcelona)
Maspoch Comamala, Daniel (Institut Català de Nanociència i Nanotecnologia)
Amabilino, David B. (Institut de Ciència de Materials de Barcelona)

Data:	2014
Resum:	A spatially controlled synthesis of nanowire bundles of the functional crystalline coordination polymer (CP) Ag(I)TCNQ (tetracyanoquinodimethane) from previously fabricated and trapped monovalent silver CP (Ag(I)Cys (cysteine)) using a room-temperature microfluidic-assisted templated growth method is demonstrated. The incorporation of microengineered pneumatic clamps in a two-layer polydimethylsiloxane-based (PDMS) microfluidic platform was used. Apart from guiding the formation of the Ag(I)Cys coordination polymer, this microfluidic approach enables a local trapping of the in situ synthesized structures with a simple pneumatic clamp actuation. This method not only enables continuous and multiple chemical events to be conducted upon the trapped structures, but the excellent fluid handling ensures a precise chemical activation of the amino acid-supported framework in a position controlled by interface and clamp location that leads to a site-specific growth of Ag(I)TCNQ nanowire bundles. The synthesis is conducted stepwise starting with Ag(I)Cys CPs, going through silver metal, and back to a functional CP (Ag(I)TCNQ); that is, a novel microfluidic controlled ligand exchange (CP → NP → CP) is presented. Additionally, the pneumatic clamps can be employed further to integrate the conductive Ag(I)TCNQ nanowire bundles onto electrode arrays located on a surface, hence facilitating the construction of the final functional interfaced systems from solution specifically with no need for postassembly manipulation. This localized self-supported growth of functional matter from an amino acid-based CP shows how sequential localized chemistry in a fluid cell can be used to integrate molecular systems onto device platforms using a chip incorporating microengineered pneumatic tools. The control of clamp pressure and in parallel the variation of relative flow rates of source solutions permit deposition of materials at different locations on a chip that could be useful for device array preparation. The in situ reaction and washing procedures make this approach a powerful one for the fabrication of multicomponent complex nanomaterials using a soft bottom-up approach.
Ajuts:	Ministerio de Ciencia e Innovación CTQ2010-16339 Ministerio de Economía y Competitividad MAT2012-30994 Ministerio de Ciencia e Innovación CTQ2011-16009-E Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-158 Ministerio de Ciencia e Innovación RYC-2011-08071 Ministerio de Ciencia e Innovación RYC-2010-06530 European Commission PCIG-11-GA-2012-32139
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Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Publicat a:	ACS nano, Vol. 8, Issue 1 (January 2014) , p. 818-826, ISSN 1936-086X

DOI: 10.1021/nn4054864

Preprint 18 p, 1012.9 KB

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