Gaining quantitative structural insight at the nanoscale is an important issue in nanotechnology where size effects play a prominent role. Alongside electron microscopy, scattering techniques can be used to provide such information in solution and at the ensemble level. During this talk, i will first recall the basic theoretical and experimental aspects of (small-angle) X-ray scattering. I will then illustrate these concepts with recent examples in nanoparticle research where the use of X-ray scattering proved efficient. Notably, we recently measured precisely the size of series of PbS, PbSe, CdS and CdSe colloidal nanocrystals [1]. By measuring alongside their absorption spectra, we could set-up calibration curves relating their energy band gap to their diameter. We will discuss these results and compare them with previsous calibration curves determined by TEM. FInally, we will show that it is also possilbe to measure accuratelty the concentration of nanoparticles in solution.<br/>

Small angle x-ray scattering for sizing of semi-conducting colloidal nanoparticles

2019 Spring National Meeting

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