For instance, Feng et al. reported the large-scale preparation of Co3O4 nanosheets with a thickness of sub-3 nm in the cubic Fd-3m space group using a nonsurfactant and substrate-free hydrothermal method. These authors explored the effect of hydrothermal growth temperature on reaction yield and morphology. In 2015, Dunne et al. implemented the first continuous hydrothermal flow synthesis of MoS2 nanosheets. In addition, the number of MoS2 layers nanosheets could be controlled under hydrothermal conditions from the varying the reaction time as well as the used organic reducing agent . Ongoing efforts have been focused in scalable production of a huge variety of 2D layered materials for high-quality materials growth with well-controlled nanoscale properties . In this scenario, we believe that the conventional and unconventional hydro(solvo)thermal strategies may play a more prominent role in relation to preparing novel 2D materials. From the examples presented in Table , we can see the conditions for obtaining these systems. Based on these conditions, we can see that the hydro(solvo)thermal growth of 2D layered materials is usually performed at low relativetly temperature. Precursor: Ammonium molybdate tetrahydrate + absolute ethanol 180 ºC for 20 h. Ethylenediamine +red phosphorus 165 ºC for 24 h Bi(NO3)3.5H2O + acetic acid + KBr +deionized water 120ºC for 24h BiOBr + ethanol + Co(OAc)2.4H2O + thiourea 180 ºC for 12h