Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Interfaces and Thin Films I
CPP 14.7: Vortrag
Montag, 12. März 2018, 16:45–17:00, C 264
Electronically coupled two-dimensional assembly of Cu2-xS nanocrystals for selective vapor sensing applications — •Sonam Maiti1,2, Santanu Maiti2, Yvonne Joseph3, Andreas Wolf4, Dirk Dorfs4, Frank Schreiber2, and Marcus Scheele1 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany — 2Institute of Applied Physics, University of Tuebingen, Tübingen, Germany — 3TU Bergakademie Freiberg, Freiberg, Germany — 4Leibniz Universität Hannover, Hannover, Germany
The fabrication of two dimensional (2D) ordered nanocrystal (NC) superlattice films with unique physical properties has remained a challenge for years [1,2]. Here, we demonstrate a novel method to prepare electronically coupled, monolayered films of Cu2-xS NCs with the organic semiconductor molecule TACuPh, which exhibits fascinating charge carrier transport and optical properties. A systematic temperature dependence of the conductivity of the film is studied over a wide range of temperatures. The results indicate that charge carrier transport is governed by 2D variable range hopping (VRH) in the temperature range (280-30K) and changes from Mott VRH to Efros-Shklovskii VRH below 60 K. The high conductivity is attributed to better interparticle coupling by virtue of TACuPh, which is also evident from GISAXS. Finally, the films show good sensing performance towards 4-methyl-2-pentanone and toluene vapors at 0% relative humidity [3]. [1] X. Huang et al. Adv. Mater. 2014, 26, 2185. [2] M. Scheele et al. PCCP, 2005, 17, 97. [3] Y. Joseph et al. Sensor Actuat B, 2004, 98.