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Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography

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Published on: September 2, 2017

Interfacing colloidal graphene oxide sheets with gold nanoparticles.

Fengli Bei¹, Xueliang Hou, Shery L Y Chang

¹Department of Materials Engineering, Monash University, VIC 3800, Australia.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|April 16, 2011

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Graphene oxide (GO) sheets capture and disperse gold nanoparticles (AuNPs) in water, creating stable, uncapped metal nanostructures. This controllable interaction, driven by GO

Area of Science:

Colloid and Surface Science
Nanomaterials Science
Physical Chemistry

Background:

Graphene oxide (GO) and citrate-stabilised gold nanoparticles (AuNPs) are negatively charged colloids.
Understanding interactions between like-charged colloids is crucial for materials synthesis.
Controlling nanoparticle assembly in solution remains a challenge.

Purpose of the Study:

To investigate the interaction between graphene oxide (GO) and gold nanoparticles (AuNPs).
To reveal the solution behavior of GO using AuNPs as a probe.
To demonstrate a novel method for synthesizing metal-nanoparticle assemblies.

Main Methods:

Utilizing surface plasmon resonance (SPR) spectra of AuNPs to monitor interactions.
Studying the role of the electrical double layer of GO in colloid interactions.

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Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography

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Investigating the capture and dispersion capabilities of GO for AuNPs.

Main Results:

A one-way gate effect governs the interaction between GO and AuNPs.
GO controllably captures and disperses AuNPs in aqueous solution without linkers.
Successful synthesis of uncapped, yet solution-dispersible metal-nanoparticle assemblies.
GO acts as a unique soluble nanocarrier/substrate for material synthesis.

Conclusions:

The electrical double layer of GO is key to controlling GO-AuNP interactions.
GO enables the facile synthesis of advanced metal nanostructures for plasmonics and sensing.
GO's unique properties make it an ideal nanocarrier for soluble functional materials.