A focus for this study is given to the properties retrieved from UV-vis measurements because UV-vis spectra are very informative when it comes to plasmonic Au NPs. The characterization is completed by scanning transmission electron microscopy (STEM). To develop more sustainable research, it will not be realistic to use all characterization methods reported for Au NPs for all the samples obtained here with a relatively high throughput. Further characterization of the surfactant-free fcc Au NPs by XPS, XRD, X-ray total scattering with PDF analysis or zeta-potential measurements can be found elsewhere.