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Updated: Jan 26, 2026

Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
Published on: September 2, 2017
Using colloidal lithography to control the formation of gas sorption sites through galvanic replacement reaction
Bebeto Lay1, Ylias M Sabri1, Ahmad E Kandjani1
1Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, Melbourne 3000, Australia.
Abstract:
Using colloidal lithography, a series of inverted long-range ordered crystals (i-LROCs) of Pd honeycombs were fabricated on quartz crystal microbalance (QCM) sensors. The structures formed provided the required platform for the proceeding galvanic replacement reaction (GR) process to generate seamless Au nanoparticle deposits throughout the i-LROC. The results showed that controlling the dimensions of the pores in the developed Pd i-LROCs is important in the formation of gold deposition sites on the uniform structures through the GR reaction process. The developed Pd/Au i-LROC deposited sensors showed significant enhancement in the sensitivity toward Hg0 vapor when compared to pure Pd structures, with limit of detection improving from 60.0 to 13.7 µg/m3, respectively. Furthermore, a significant improvement in the modified sensor's selectivity toward Hg0 in the presence of other industrial related gas species was observed which is attributed to the addition of Au to the Pd structures through GR reaction.
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