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Open Access Nano Express

Direct patterning of silver particles on porous silicon by inkjet printing of a silver salt via in-situ reduction

Alessandro Chiolerio1*, Alessandro Virga2, Paolo Pandolfi3, Paola Martino3, Paola Rivolo23, Francesco Geobaldo2 and Fabrizio Giorgis12

Author Affiliations

1 Istituto Italiano di Tecnologia, Center for Space Human Robotics, Corso Trento 21, Torino, 10129, Italy

2 Applied Science and Technology Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129, Italy

3 Politronica Inkjet Printing S.r.L., Corso Castelfidardo 30/A, Torino, 10129, Italy

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Nanoscale Research Letters 2012, 7:502  doi:10.1186/1556-276X-7-502

Published: 6 September 2012

Abstract

We have developed a method for obtaining a direct pattern of silver nanoparticles (NPs) on porous silicon (p-Si) by means of inkjet printing (IjP) of a silver salt. Silver NPs were obtained by p-Si mediated in-situ reduction of Ag+ cations using solutions based on AgNO3 which were directly printed on p-Si according to specific geometries and process parameters. The main difference with respect to existing literature is that normally, inkjet printing is applied to silver (metal) NP suspensions, while in our experiment the NPs are formed after jetting the solution on the reactive substrate. We performed both optical and scanning electron microscopes on the NPs traces, correlating the morphology features with the IjP parameters, giving an insight on the synthesis kinetics. The patterned NPs show good performances as SERS substrates.

Keywords:
Inkjet printing technology; Ag nanoparticles; Porous silicon; SERS