Given the simplicity of the synthesis that requires only little experimental skills and equipment to timely produce samples with different sizes using only few and safe chemicals, the synthesis method is promising for non-experts in material science to rapidly produce tailored Au NPs for various purposes. It is expected that the simple RT synthetic method presented with its unique features has the potential to become a valuable tool towards higher throughput screening of NP synthesis and properties, ultimately leading to more comprehensive studies to achieve improved NM design.