## 1 Introduction  
The novelty and outstanding properties of two-dimensional materials have drawn significant interest in various applications. Among them, transition metal dichalcogenides (TMDCs) deserve special attention. TMDCs are layered compounds of the general formula MX\({}_{2}\) consisting of the transition metal element M, such as Mo, Re, W, Nb, placed between two chalcogenous planes of X atoms, i.e., S, Se. So far, the most studied of these materials is molybdenum disulfide (MoS\({}_{2}\)) [1; 2; 3]. MoS\({}_{2}\) has found applications in various fields. The most common is the use as a dry lubricant. It is characterized by a low friction factor due to weak van der Waals forces between layers, and therefore its monolayers can easily slide over each other [4]. Moreover, with its ability to operate in critical conditions such as low or very high temperatures and an oxygen-poor environment, MoS\({}_{2}\) is desirable for space and aerospace applications [5; 6]. Its lamellar structure also allows using MoS\({}_{2}\) in other lubrication applications. There are various oils and greases on the market with improved lubricating properties due to the addition of MoS\({}_{2}\). However, the problem to overcome is its tendency to agglomerate [4; 7; 8; 9]. The nanosized particles have better access to rubbing parts and, therefore, better tribological properties. For this purpose, different approaches have been proposed, for example, reducing its size by exfoliation or obtaining nanosized particles by using supports for the MoS\({}_{2}\) deposition [4; 10]. Depending on the number of layers and crystal structure, MoS\({}_{2}\) presents different properties. Unlike bulk MoS\({}_{2}\), its nanoparticles exhibit good catalytic activity. Nanosized MoS\({}_{2}\) has been broadly studied as a catalyst for several reactions, particularly towards hydrogen evolution reaction [11; 12; 13; 14]. Therefore, as in the case of lubricating applications, the size of MoS\({}_{2}\) is a vital aspect [15]. Moreover, research has been undertaken on various forms of molybdenum disulfide to obtain the best catalytic properties. The 1T form with octahedral coordination can be distinguished, presenting improved properties over its more common forms, i.e., 2H or 3R. The higher catalytic activity is due to the fact that both the edge and base planes are catalytically active [16; 17]. The use of an amorphous MoS\({}_{2}\) is also a substantial approach. Its high catalytic activity and stability have aroused great interest. Moreover, crystalizing MoS\({}_{2}\) is an expensive process demanding critical operating conditions. Therefore, maintaining an amorphous form of MoS\({}_{2}\) allows obtaining high catalytic activity at relatively low costs [18]. There is also a possibility to combine MoS\({}_{2}\) with other materials, such as carbon nanomaterials [11; 19; 20]. There are many methods of producing MoS\({}_{2}\)-based materials [21; 22; 23; 24]. Some of these methods, such as chemical vapor deposition and hydrothermal methods, are very expensive or not scalable. However, among them, wet chemical synthesis can be distinguished. The wet chemical synthesis involves reactions carried out in an aqueous solution at proper experimental conditions. As a result of precipitation in an oversaturated solution, amorphous MoS\({}_{2}\) is formed [25]. Moreover, it is possible to add to the synthesis support for MoS\({}_{2}\) growth. While maintaining good mixing conditions, heterogeneous nucleation occurs in the entire volume of the reaction mixture, thanks to which MoS\({}_{2}\) particles are formed evenly over the whole support's surface. The obtained product is contaminated and should be cleaned by filtration or centrifugal methods and then by annealing. Depending on the annealing temperature, it is possible to control the degree of crystallinity of the obtained product [26]. This method is relatively inexpensive and facile, not requiring special apparatus or process conditions, making it very attractive for the industrial market.