Reactive inkjet printing (RIJ) is becoming a versatile and promising technique in materials synthesis and device engineering. In this regard, Keyspeaker Ghassan Jabbour, for the first time, will discuss the application of RIJ in modifying the sheet resistivity of conducting polymer layers, and in combinatorial mapping of such property. In addition, latest accomplishments in this field will be introduced, including the self-assembly of nano-materials, quantum dots, and conductive textile.