Controllable Synthesis of Solid Catalysts by High-Temperature Pulse

Prediction of future breakthroughs in materials synthesis and manufacturing techniques: a new perspective of synthesis dynamics theory

“…The stringent requirements for atmosphere, pressure, peak temperature, and heating/cooling rates inevitably involve various reaction chambers, sensors, and precise controllers operating at high temperatures or pressures, which deserve significant investment. 24,25 Indeed, adjusting the temperature transfer rate enables one to realize the precise and rapid synthesis of complex materials, but in global aspects of the synthesis technology and the impact on the resulting material, the temperature transfer rate is only a part of the whole process. Furthermore, the intrinsic reasons explaining how ultrafast technology affects the synthesis process have not yet been clearly understood.…”

Epitaxial Growth of Graphene on SiC by Thermal Shock Annealing Within Seconds

“…[29] It is imperative to highlight that the programmable TSA method, which operates on the Joule heating principle, has the ability to generate kinetically fast (>1000 °C s −1 in heating or cooling rate) and thermodynamically extreme (>2000 °C in peak temperature) conditions for material synthesizing (Figure 2e). [30][31][32][33][34][35] In order to gain insight into how the unique synthetic condition of TSA influences the quality of EG, and then to develop a methodical approach toward rational materials synthesis, both temperature and time parameters that are intricately linked to the quality and layer number of EG were comprehensively studied. Higher temperatures lead to a reduction in defects as evidenced by a decrease in the value of I D /I G , and also lead to an increase in the layer number of EG as indicated by a decrease in the value of I 2D /I G (Figure 2f).…”

Rapid synthesis of high-purity molybdenum carbide with controlled crystal phases

“…19 Furthermore, although thermodynamically stable β-Mo 2 C readily forms under prolonged high-temperature conditions, the synthesis of high-crystallinity products of metastable phases such as α-MoC 1− x and η-MoC 1− x presents greater challenges. 22,35–37 Recent approaches have employed ultra-rapid heating of solid mixtures of carbon and molybdenum sources to synthesize Mo x C. 38–41 For instance, pure β-Mo 2 C has been synthesized in just 20 seconds using microwave-assisted techniques with MoO 3 or Mo powder and carbon, 42,43 and supported β-Mo 2 C, α-MoC 1− x and η-MoC 1− x nanocrystals on flash graphene have been synthesized via ultrafast flash Joule heating within one second. 44 However, the formation of Mo x C phases in these methods is predominantly kinetically controlled, and the non-equilibrium heating complicates the analysis of crystal structure evolution during preparation.…”