Heading toward Miniature Sensors: Electrical Conductance of Linearly Assembled Gold Nanorods

Metal nanoparticles are increasingly used as key elements in the fabrication and processing of advanced electronic systems and devices. For future device integration, their charge transport properties are essential. This has been exploited, e.g., in the development of gold-nanoparticle-based conduct...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2023-04, Vol.13 (9), p.1466
Main Authors: Hoffmann, Marisa, Schedel, Christine Alexandra, Mayer, Martin, Rossner, Christian, Scheele, Marcus, Fery, Andreas
Format: Article
Language:English
Subjects:
Analysis
anisotropic conductance
Aqueous solutions
Charge transport
Circuits
Colloid chemistry
Conductance
Conductivity
Dislocations
Electric properties
Electrical conductivity
Electrical resistivity
Electronic systems
Fabrication
Gold
Gold compounds
gold nanorods
Inks
Microscopy
Nanoparticles
Nanorods
Nanospheres
Nanowires
Self-assembly
Sensors
Signal transduction
Spectrum analysis
Transport properties
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Summary:Metal nanoparticles are increasingly used as key elements in the fabrication and processing of advanced electronic systems and devices. For future device integration, their charge transport properties are essential. This has been exploited, e.g., in the development of gold-nanoparticle-based conductive inks and chemiresistive sensors. Colloidal wires and metal nanoparticle lines can also be used as interconnection structures to build directional electrical circuits, e.g., for signal transduction. Our scalable bottom-up, template-assisted self-assembly creates gold-nanorod (AuNR) lines that feature comparably small widths, as well as good conductivity. However, the bottom-up approach poses the question about the consistency of charge transport properties between individual lines, as this approach leads to heterogeneities among those lines with regard to AuNR orientation, as well as line defects. Therefore, we test the conductance of the AuNR lines and identify requirements for a reliable performance. We reveal that multiple parallel AuNR lines (>11) are necessary to achieve predictable conductivity properties, defining the level of miniaturization possible in such a setup. With this system, even an active area of only 16 µm shows a higher conductance (~10 S) than a monolayer of gold nanospheres with dithiolated-conjugated ligands and additionally features the advantage of anisotropic conductance.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano13091466