It is well known that nanomaterials offer many unique and variety properties arousing great interest of researchers and give hope to the many potential applications. Silicon carbide also belongs to this type of material [1-4]. In particular, the 1-D dimensional form (nanofibers, nanowires, nanotubes) is most promising, mainly for a good electrical and mechanical properties [5-8]. There have been many attempts to produce a 1-D SiC, for example:
             - synthesis from the elements [9,10];
             - carbothermic reduction [11];
             - chemical vapor deposition [12];
             - arc, microwave or induction discharge [13];
             - NRW use as template for the growth [14];
             - laser ablation [15];
             - “hot filaments” method [16].

The above-mentioned methods and techniques of production of 1-D SiC are, however,  multi-step approaches while energy and time-consuming factors makes them at the same time unattractive in the process scale-up and industrial use. Thus, the combustion synthesis (CS), which is a new way to obtain silicon carbide nanofibres is economically justified and privileged.
     Combustion synthesis  is a well-known method [17] for the preparation of useful compounds of carbon, such as nano SiC, activated carbon, [18] and magnetic carbon encapsulated [19]. The high temperature and pressure of very fast redox reaction provide opportunities to process materials with a high melting point. Furthermore, these reactions are thermally autogenous and usually lead to the formation of nano-sized products. Basically, there is no restriction on the choice of appropriate reagents, it is important, however, to connect a strong oxidizer and reducer [20]. From the past experience it can be concluded that by careful selection of starting reactants the combustion leads to the desired product, but in most cases the mechanism of the process is still not clearly defined. In addition, the proposed synthesis method is autothermal, which means that after the initiation the reaction is carried out without energy needs. This makes such processes economically very attractive.
      The aim of this study is to demonstrate that SiC nanofibers can be one-pot produced in fast and single step synthesis using waste materials as substrates and to optimize the conditions in order to maximize the main product - nanofibers SiC.
 

Fig. 1. Fragments of discarded or waste silicon solar panels (A); the experimental setup after the process (Si from waste panels and waste PTFE powder, 1 MPa, air atmosphere) (B)

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1. Combustion synthesis of Si-related crystalline nanostructures
2. Nanowłókna węglika krzemu SiC: produkcja, charakteryzacja, zastosowania