Graphdiyne-Based Thermal Fluids

Graphdiyne (GDY) exhibits great application potential. However, large-yield and scalable exfoliation of few-layered GDY nanosheets (GDYNSs) remains a huge challenge. Here, we reported a liquid-phase, facile and efficient hydrothermal exfoliation approach to produce mono- or few-layered GDYNSs, which can achieve 82 wt% of high actual yield and 5 mg/ml concentration. The GYDNSs were then dispersed in mineral oil (MO) to act as heat transfer NANOfluids for the first time. Typically, at a fraction of 1.0 vol %, the nano-oils showed significantly enhanced thermal conductivity ((K_eff/K₀)-1) %, up to ∼122%. The low filler fraction and high thermal conductivity enhancement for this GYDNSs/MO nano-oil demonstrates several thermal transfer applications of heavy equipment. Our work provides reasonable insight into the exfoliation and thermal-fluid applications of GDYNSs.