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Ligand exchange based molecular doping in 2D hybrid molecule-nanoparticle arrays: length determines exchange efficiency and conductance

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Abstract

Effective control of ligand exchange is important in the emerging field of nanoparticle-based meta-materials; controlling both the separation and electronic coupling between nanoparticles impacts the electrical, optical, chemical, and thermal properties of these materials. However, methods to evaluate exchange efficiency are generally lacking for solid state devices. In this paper, it is shown that controlling the initial ligand length determines the efficiency of the secondary ligand's substitution into the nanoparticle array. Controlling this ligand exchange efficiency determines the post-exchange conductance in a manner akin to doping in conventional semiconductor systems. For a series of initial ligand lengths the distribution of nanoparticle separations in the array is determined, and the ligand exchange efficiency is extracted using a bond percolation model. Finally, Monte Carlo simulations of charge transport in the arrays agree with the experimental conductance data for each molecular state and support the determination of the corresponding exchange efficiencies. This analysis provides a general framework for maximizing the efficiency of ligand exchange that will benefit the use of nanoparticle films in electronic, optoelectronic, plasmonic, and sensing systems.

Graphical abstract: Ligand exchange based molecular doping in 2D hybrid molecule-nanoparticle arrays: length determines exchange efficiency and conductance

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Publication details

The article was received on 28 Apr 2017, accepted on 19 Jul 2017 and first published on 19 Jul 2017


Article type: Paper
DOI: 10.1039/C7ME00033B
Citation: Mol. Syst. Des. Eng., 2017, Advance Article
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    Ligand exchange based molecular doping in 2D hybrid molecule-nanoparticle arrays: length determines exchange efficiency and conductance

    C. E. McCold, Q. Fu, S. Hihath, J. Han, Y. Halfon, R. Faller, K. van Benthem, L. Zang and J. Hihath, Mol. Syst. Des. Eng., 2017, Advance Article , DOI: 10.1039/C7ME00033B

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