10-04-2017, 08:49 PM
The inkjet printing has grown into a mature noncontact patterning method in the recent times. With this method, large-area patterns can be easily created with high speeds while using only small amounts of functional materials and also high resolution can be achieved. RFID tags, organic thin-film transistors OTFTs and electrochromic devices ECDs are the major areas employing the method of inkjet printing. The future of plastic electronics is focussed on this technology.
solution processable materials are used to print conductive features onto polymer substrates. A dispersions of silver nanoparticles in an organic solvent is the solution that is most frequently used because they are relatively easy to
prepare and also because silver has the lowest resistance . A thermal heating step is required for removing the organic binder that will render the fabricated features conductive. The nanoparticles are ususlly stabilised using thiols or carboxylic acids. The printability of the ink is also promoted by the addition of organic binders to the ink.
Nanoparticles with a diameter below 50nm have a significantly reduced sintering temperature, typically between 160 and 300 degree celcius which is significantly below the melting point of the substrate material. But common polymer foils cannot stand the conventional sintering procedures.
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