Nanocrystal Inks without Ligands: Stable Colloids of Bare Germanium Nanocrystals

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Entry by Yuhang Jin, AP225 Fall 2011

Reference

Zachary C. Holman and Uwe R. Kortshagen, Nano Lett., 2011, 11, 2133.

Key words

nanocrystal, quantum dot, colloidal stability, germanium, benzonitrile

Introduction

Colloidal semiconductor nanocrystals (NCs) have received increasing attention recently for their potential in novel optical and electronic devices, and in particular inexpensive printing of quantum-confined thin films. Methods have been developed to synthesize II-VI and IV-VI NCs in solution with ligands, which provide steric stabilization in nonpolar solvents so that aggregation of NCs due to van derWaals forces does not occur. However, the ligands also hinder charge carrier transport between NCs, resulting in insulating films. Exchanging the ligands for shorter molecules or removing the ligands after film deposition seem to be alternative approaches, but they both have intrinsic difficulties due to the formation of covalent bonds or other adverse properties of the materials involved.