Inorganic Surface Functionalization of Colloidal Nanocrystals

Kovalenko Maksym^a

^aSwiss Federal Institute of Technology ETH Zurich, Switzerland

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2015 (NFM15)

Santiago de Compostela, Spain, 2015 September 6th - 15th

Invited Speaker, Kovalenko Maksym, presentation 056
Publication date: 8th June 2015

Chemically synthesized inorganic nanocrystals are considered to be promising building blocks for a broad spectrum of applications in solid-state devices. To achieve high degree of electronic coupling, the nanocrystal packing, surface chemistry and surrounding medium need to be properly designed. With the advent of inorganic capping ligands [1], a considerable progress has been demonstrated to-wards nanocrystal-based photovotaics, photodetectors, electronics, thermoelectrics, Li-ion batteries and other applications. The search for new inorganic ligands, which enhance both the individual and collective properties of nanocrystals, remains an important task. To this end, we have shown recently that metal halide com-plexes such as methylammonium lead halides can act as versatile capping ligands, providing high col-loidal stability and efficient electronic passivation [2]. Very little is known about the atomistic details of the interface between the nanocrystal surface and inorganic capping ligands. We will discuss our most recent work in this direction, including novel sur-face-enhanced nuclear-magnetic resonance spectroscopy [3], and comprehensive spectroscopic study (XAS, far-IR, NMR, Raman) on the binding of halometallate and chalcogenidometallate anions to the nanocrystal surface.

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