Sub-20nm Nanotransfer Printing


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1. Sub-20nm S-nTP

■ Sub-20-nm nanofabrication through novel nanotransfer printing

Nanotransfer printing (nTP) technology offers outstanding simplicity and throughput in the fabrication of transistors, metamaterials, epidermal sensors, and other emerging devices. Nevertheless, the development of a large-area sub-50 nm nTP process has been hindered by fundamental reliability issues in the replication of high-resolution templates and in the release of generated nanostructures. Our group presented a solvent-assisted nanotransfer printing (S-nTP) technique based on high-fidelity replication of ultrahigh-resolution (8 – 20 nm scale) patterns using a dual-functional bilayer polymer thin film. For uniform and fast release of nanostructures on diverse receiver surfaces, interface-specific adhesion control was realized by employing a polydimethylsiloxane (PDMS) gel pad as a solvent-emitting transfer medium, providing unusual printing capability even on biological surfaces such as human skin and fruit peels.



■ Potential applications of sub-20-nm nanotransfer printing

Our high-resolution nanotransfer printing can be applied in diverse fields for the fabrication of future nanodevices with exceptional functionalities. As an example, we demonstrated reliable printing of high-density metallic nanostructures for non-destructive and rapid surface-enhanced Raman spectroscopy analyses and for hydrogen detection sensors with excellent responsiveness.


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2. S-nTP  Applications


  • Fuel Cell

Due to the growing concerns on the depletion of petroleum-based energy resources and climate change, hydrogen energy has attracted much attention as potential zero-emission and renewable energy in the future. In order to utilize this chemical energy electrical energy, energy conversion system such as fuel cell has high demands. Among the various fuel cells, the hydrogen-fuel polymer electrolyte membrane fuel cells, or PEMFCs, are the most encouraging for commercial applications such as electric vehicles and residential power generation systems. However, we still face several obstacles for commercialization of PEMFCs, including high-cost for electrode fabrication and poor durability. Consequently, we suggested high-performance electrode for PEMFC through self-assembly and nanotransfer printing. Due to carbon-free, ultrathin and well-defined 3-dimensional nanostructures with highly active catalytic materials, we could achieve extremely long-lasting and efficient electrode for PEMFCs.


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  • Sensor


Gas detection has its crucial importance for controlling industrial and vehicle emissions, household security and environmental monitoring. In recent decades there has been many developments in devices designed for detecting several chemicals. Sensor technology is in active progress to achieve higher sensitivity, higher selectivity, and reduction in size for heat loss.
However, when it comes to conventional chemical detectors, most of them still have low sensitivity and demand a heat source to detect chemicals. Most gas sensors on use have low sensitivity and require high operation temperatures. Such problem has inspired the study of new materials and promoted the use of nanostructured materials to bring out new properties from traditional materials. Nevertheless, the selective detection of a certain predefined gas species is the most critical requirement in sensor technology.
Synergetic or complementary effects results in outstanding performance of organic–inorganic hybrid gas sensors in terms of selectivity and sensitivity towards single gas species. The enormous variety of organic functionalities enables novel flexibility of active sensor surfaces compared to commonly used pure inorganic materials.


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■Jae Won Jeong, Se Ryeun Yang, Yoon Hyung Hur, Seong Wan Kim, Kwang Min Baek, Soonmin Yim, Hyun-Ik Jang, Jae Hong Park, Seung Yong Lee, Chong-Ook Park & Yeon Sik Jung*, ”High-resolution nanotransfer printing applicable to diverse surfaces via interface-targeted adhesion switching”Nature Communications, 2014, 5, 5387  [PDF file]

■Kwang Min Baek, Jong Min Kim, Jae Won Jeong, Seung Yong Lee*, and Yeon Sik Jung*, ”Sequentially Self-Assembled Rings-in-Mesh Nanoplasmonic Arrays for Surface-Enhanced Raman Spectroscopy” Chemistry of Materials, 2015, Online published  [PDF File]