Scalable MoS2 Synthesis and Ag Paste Formulation

The precursor solutions for producing MoS₂ were synthesized using our recently developed approach^{10 (link)}. A 1 M sulfur solution was prepared by dissolving S (Alfa Aesar, Fisher Scientific) in carbon disulfide (CS₂, Yakuri Pure Chemicals Co., Ltd). The precursor solution was obtained by dissolving ammonium tetrathiomolybdate ((NH₄)₂MoS₄, 99.97%, Sigma Aldrich) in 4 parts of ethanolamine (Sigma Aldrich) and 4 parts of butylamine (Sigma Aldrich) with the S solution. Then, 2 parts of n,n dimethylformamide (DMF, Sigma Aldrich) were added to the solution to form the precursor solution. In our CVD-free method, S was added during solution preparation to yield an S-rich precursor instead of adding S powder separately, as proposed in other CVD methods.
The silver paste was formulated by mixing 100 parts of original Ag paste (4000 cps, AD-V7-108) with 1 part of Silveray (solvent) and 3 parts of propylene glycol methyl ether acetate (PGMEA, Sigma Aldrich). This was done to make an even paste and prevent clogging at the tip capillarity during the printing process according to our recent publication^{13 (link)}. We modified it in order to be relevant to this research.