Fabrication of bimetallic nanoparticle arrays with gradient compositions on a single substrate by block copolymer self-assembly
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Block copolymers self-assembly has been intensively studied because they offer a simple and low-cost nanopatterning method which can be applicable in various fields. Especially, there is also an advantage in that metallic nanoparticle array could be easily produced by loading a metal ion into one of polymer component. In this study, we fabricated Co/Ni bimetallic nanoparticle arrays with gradient compositions by sequentially loading two different metal ions. It was found that the ratio of Co/Ni is determined by the immersion sequence and time into each metal precursor solution. The immersion time could be gradually changed within the substrate by using a motorized dipping machine, and as a result, bimetallic nanoparticle arrays with a gradient Co/Ni composition could be fabricated. We believe that this bimetallic nanoparticle arrays could provide a simple platform for finding optimal composition in two-component catalysts. Furthermore, this platform will be utilized for dry reforming of methane and methane decomposition reactions.