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.
Highlights
Inkjet printing (IjP) technology has gained a great interest for the information technology compartment due to its high throughput and low costs [1]
Direct patterning of stripes The synthesis of Ag NPs is based on the impregnation of porous silicon (p-Si) in AgNO3 solutions through a redox process involving Ag+ cations with the hydride-covered surface [5,7,8], where the Ag reduction on the p-Si surface can be explained taking into account the following reaction for aqueous solutions: Figure 3 Optical mosaic image of the IjP drop on position (DOP) spots on p-Si, labeled in rows and columns
The pure ethylene glycol (EG) solution resulted in droplet coalescence and a complete NP stack formation, as determined by field emission scanning electron microscopy (FESEM)
Summary
Inkjet printing (IjP) technology has gained a great interest for the information technology compartment due to its high throughput and low costs [1]. It consists of a microelectromechanical system or a capillary where a piezoelectric actuator is able to produce a controlled droplet ejection. As a matter of fact, the fabrication of quite high-resolution patterns either on flexible substrates or on rigid ones, by means of this simple additive process, is highly attractive. The morphology of the Ag NPs is correlated to the synthesis parameters Such process opens new possibilities of simple fabrication concerning with metal-dielectric nanostructures aimed to sensing applications based on amplified Raman spectroscopy
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