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 towards 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 complexes such as methylammonium lead halides can act as versatile capping ligands, providing high colloidal 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 surface-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(XAS, far-IR, NMR, Raman) on the binding of halometallate and chalcogenidometallate anions to the nanocrystal surface [unpublished]. [1] Kovalenko, M. V.; Scheele, M.; Talapin, D. V. Science 2009, 324, 1417. [2] D. N. Dirin, S. Dreyfuss, M. I. Bodnarchuk, G. Nedelcu, P. Papagiorgis, G. Itskos, and M. V. Kovalenko. J. Am. Chem. Soc., 2014, 136, 6550–6553. [3] L. Protesescu, A. J. Rossini, D. Kriegner, M. Valla, A. de Kargommeaux, M. Walter, K. V. Kravchyk, M. Nachtegaal, J. Stangl, B. Malaman, P. Reiss, A. Lesage, L. Emsley, C. Coperet, and Maksym V. Kovalenko. ACS Nano, 2014, 8, 2639–2648.

All-inorganic design of colloidal nanocrystals: New inorganic ligands and new atomistic insignts into their surface binding

249th National Meeting (2015)

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