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Biofunctionalized Prussian Blue Nanoparticles for Multimodal Molecular Imaging Applications

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Nanoparticle Linker-Controlled Molecular Wire Devices Based on Double Molecular Monolayers.

Sohyeon Seo^1,2, Bui Quoc Viet², Eunhee Hwang²

¹Centre for Integrated Nanostructure Physics (CINAP), Institute of Basic Science (IBS), Suwon, 16419, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)

|May 29, 2019

Summary

Gold nanoparticle linkers enhance electrical conductivity in molecular wires by facilitating electron transport through cobalt bis-terpyridine molecules. This breakthrough enables more reliable molecular electronic circuits.

Keywords:

double-SAM electron transport molecular wires nanoparticle contact van der Waals gap

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Area of Science:

Molecular electronics
Nanotechnology
Materials science

Background:

Molecular wires are crucial for molecular electronics, requiring exploration of molecule-electrode interactions.
Efficient charge transport in molecular junctions is key to device functionality.

Purpose of the Study:

To investigate new molecular wire junctions enhancing charge transport.
To explore the role of gold nanoparticles (AuNPs) in double self-assembled monolayers (SAMs) of cobalt bis-terpyridine molecules.

Main Methods:

Fabrication of molecular junctions using AuNP-linked double SAMs of cobalt bis-terpyridine molecules.
Electrical characterization of the junctions to assess charge transport.
Electrochemical analysis of AuNP-Co(II)(tpyphS)2 SAMs.
Density functional theory (DFT) calculations to understand electronic structure.

Main Results:

AuNP linkers act as electron-transparent contacts in Co(II)(tpyphS)2 junctions.
Weak temperature dependency indicates sequential tunneling conduction via highest occupied molecular orbitals (HOMOs).
Fast electron transfer observed in AuNP-Co(II)(tpyphS)2 SAMs.
DFT calculations show junction formation significantly affects HOMO levels.

Conclusions:

AuNP linkers facilitate efficient intermolecular charge transport in molecular wires.
This AuNP-mediated connection offers a rational design for reliable electrical connectivity in molecular electronic circuits.