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Superhydrophobic plasmonic nanoarchitectures based on aluminum hydroxide nanotemplates
Yoon, Daesung,Chae, Songhwa,Kim, Wook,Lee, Donghun,Choi, Dukhyun The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.36
<P>The combined characteristics of non-wettabililty and strong plasmonic resonances make superhydrophobic plasmonic nanostructures an appealing tool for ultrasensitive detection in surface-enhanced Raman scattering (SERS). However, inducing superhydrophobic surfaces on originally hydrophilic metals (<I>e.g.</I>, gold, silver) while achieving high plasmonic enhancement requires sophisticated surface engineering and often involves complex fabrication processes. In this article, we design and fabricate cost effective and scalable plasmonic nanostructures with both superhydrophobicity (a water contact angle @@>@@160°) and high SERS signal (enhancement factor ≈10<SUP>6</SUP>). Silver-coated aluminum hydroxide nanotemplates are obtained from a simple wet process, followed by thermal evaporation of silver nanoparticles. We find that the largest SERS enhancement is obtained when the contact angle is maximum. This confirms that the control of surface wettability is an effective way to improve detection sensitivity in SERS measurements. The nanotemplates developed in this study could be applied further in various applications, including microfluidic biomolecular optical sensors, photocatalysts, and optoelectronic devices.</P>
ITO-based flexible electronics with optimized bendability using neutral axis engineering
Daesung Yoon(윤대성),Sangmin Lee(이상민),Woonbong Hwang(황운봉),Dukhyun Choi(최덕현) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The importance of flexibility for electronic devices have been emphasized for future potable and wearable electronics, and the buffer material has been employed to increase their bendability. However, because the material property and geometry of a buffer layer could be different for the purpose of the electronic devices, the bendability optimization of the flexible electronic devices is needed depending on the thickness and elastic modulus of that. Here, we report a design rule to optimize the bendability of ITO-based flexible electronics by neutral axis (NA) engineering, considering the correlation between the thickness and the elastic modulus of the buffer layer. Thus, our strategy may provide great advantages for flexible electrodic devices such as organic solar cells, organic light emitting diodes, and organic transistor.