Comparación del tamaño de nanopartículas de oro empleando diferentes técnicas y protocolos de medición

With the increasing advance of nanotechnology, both in the academic and commercial areas, the need for nanoparticle characterization techniques and protocols has grown. Although there are several measurement methods, the "true" size of nanoparticles cannot be understood in absolute terms but related to the material, the technique and to the protocols or criteria associated with these measurements. In other words, when we talk about the size of a particle, we must take into account two basic questions: what are we measuring? and how do we measure? From the metrological point of view, it is important to discuss the criteria to take into account, and which additional parameters should we report when presenting a nanoparticle size result. The present work shows, comparatively, the characterization of the size of homogeneous gold nanoparticles, using different techniques and measurement criteria with DLS, UV-VIS and HR-TEM methods. The results show how the definition of size is important to establish a result, as well as the criteria chosen when performing the particle counting.