Abstract
The combining of the bottom-up with top-down techniques is essential to construct novel micro-/ nano-materials according to the requirements of its end applications. This paper describes a patterndirected method that combines the advantages of photolithography and electrochemical synthesis to construct a wafer-scale Au/Pt bimetallic flowerlike structure array. With this technique, Au/Pt bimetallic flowerlike structure arrays are homogeneously and highly-selectively synthesized from Au patterns with different spacing, dimensions and shapes on a 4-inch silicon wafer. The Au/Pt flowers are also wellconstructed in the different designed array such as ‘KAIST’ and ‘NOBEL’. The surface morphology of the Au/Pt flower was observed using scanning electron microscope (SEM). The chemical composition of the bimetallic flower was confirmed using energy dispersive spectrometer (EDS) and X-ray electron spectroscopy (XPS). The X-ray diffraction (XRD) patterns of the Au pitch and Si substrate on a wafer were studied to reveal the highly-selective growth from Au pitches. A time-dependent evolution clearly presents the different growth stages of Au/Pt flower. The analysis of Au/Pt flower growth process in an individual Au pitch shows an edge-selective particle development mechanism. The method can be applied to the construction of other interesting nano/microflower arrays of metals or metal oxides. The results would be helpful for the creation of the flower with regular physical attributes (shapes and sizes) and guiding the design of a perfect array for technological innovations.
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Dr. Xing-Jiu Huang is a research professor in the School of Electrical Engineering and Computer Science at Korea Advanced Institute of Science and Technology (KAIST). His research focuses on the synthesis of nanomaterials, bioelectronic sensors, chemical sensors, and novel nanomaterial assemblies.
Ju-Hyun Kim is a Ph.D candidate in the School of Electrical Engineering and Computer Science at KAIST. His research under the direction of Prof. Choi focuses on the bio-electronic sensors and novel device fabrication.
Dr. Yang-Kyu Choi is an associate professor in the School of Electrical Engineering and Computer Science at KAIST. His research interests include multiple-gate MOSFETs, exploratory devices, and novel memory devices, nanofabrication technologies for bioelectronics, as well as nanobiosensors.
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Huang, XJ., Kim, JH. & Choi, YK. Wafer-scale controlled Au/Pt bimetallic flowerlike structure array. Gold Bull 41, 58–65 (2008). https://doi.org/10.1007/BF03215624
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DOI: https://doi.org/10.1007/BF03215624