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RISS 인기검색어
- 검색키워드
- 저자 : Paluvai, Nagarjuna Reddy (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Adsorption of sodium dodecyl sulfate on cleaning of an N-polar GaN surface in an alkaline solution
Kim, M.S.,Paluvai, N.R.,Kim, H.T.,Park, J.G. Elsevier 2017 Materials science & engineering. B, Advanced funct Vol.222 No.-
<P>The present study investigated the removal of contaminated particles from a polished N-polar GaN surface using an alkaline cleaning solution along with sodium dodecyl sulfate (SDS) surfactant. The zeta potential, etch rate, and particle removal efficiency (PRE) of N-polar GaN surfaces were reported. A lower etch rate and smoother N-polar GaN surface were obtained when the surface is treated with a diluted NH4OH solution. However, the etch rate and PRE of the N-polar GaN surface increased as a function of the pH of the NH4OH solution. The PRE of the N-polar GaN surface reached to 96% at pH 10 with a high surface roughness of 0.5 nm. SDS was added to the ammonia solutions to control the surface roughness. The N-polar GaN surface reached 100% PRE and surface roughness shown less than 0.4 nm when cleaned in a diluted NH4OH solution with 5 mM SDS surfactant in a megasonic bath. (C) 2017 Elsevier B.V. All rights reserved.</P>
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Conductive and transparent submicron polymer lens array fabrication for electrowetting applications
Hafeez, Hassan,Ryu, Heon-Yul,Paluvai, Nagarjuna Reddy,Park, Jin-Goo Informa UK (TaylorFrancis) 2018 Journal of adhesion science and technology Vol.32 No.18
<P>In this study, we have demonstrated a simple and inexpensive process to fabricate electrowetting lens arrays with various curvatures (micron to submicron) on conductive and transparent polydimethylsiloxane (PDMS) molds without additional metal layers. The microlens arrays were fabricated using one-step dual diffuser lithography process, which utilizes a pair of diffusers to diffract the incident rays of UV light at wide angles before approaching the photoresist. Dimensional control and high fill factor was achieved by just varying the exposure energy and gap between the patterns in the photomask, respectively. The patterns were replicated in conductive and transparent Ag(n)-PDMS (5-20% Ag) with 15 mu m thickness. High conductivity of 4.6 x 10(-1) S/m and high transmission efficiency of 90% was demonstrated by Ag(n)-PDMS molds. Micro-nanolens arrays fabricated by the optimized corelation were utilized to demonstrate switchable wettability behavior of water droplet at different applied voltages. The electrowetting microlens array fabrication method introduced in this work has high potential to be incorporated in optoelectronics and biomedical devices.</P>
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