Prof. Cho focused on polydimethysiloxane (PDMS), which is easily wrinkled and unfolded using oxygen and ultraviolet rays (UV). When PDMS is wrinkled minutely and then alcohol solution mixed with nanowires is poured on wrinkled PDMS, nanowires are embeded in the wrinkled lines while the alcohol solution is evaporated. After the creases are unfolded, PDMS is used as a stamp on semiconductors.
It takes one minute to get nanowires lined up and shaped the way they want. In addition, users can control nanowires’ shape and density as they change the shape of wrinkles and the condition of the stamp process. This can decrease production cost and time because it is simple and doesn’t involve high temperature.
Nanowire is extremely fine wire, the diameter is below 100nm, applied to as optical elements, sensors, batteries, catalysts, etc. This paper is highlighted on the cover of Advanced Materials, a globally prestigious press in the materials field.
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