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하이드로젤 탐침의 마모특성파악 및 재생성을 위한 하이드로젤-실리콘 하이브리드 캔틸레버 제작
김석범(Seokbeom Kim),김광석(Kwangseok Kim),이준혁(Junhyeok Lee),이정철(Jungchul Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This paper reports the direct assembly of a hydrogel nano-tip onto silicon microcantilevers to investigate wear characteristics of hydrogel atomic force microscope (AFM) tips and their facile regeneration in the case of appreciable tip damage. By directly attaching a hydrogel (polyethyleneglycol diacrylate; PEGDA) nano-tip onto a tipless silicon microcantilever, thorough wear studies of soft hydrogel AFM tips are enabled in comparison with silicon AFM tips at a well-matched resonance frequency or spring constant for the first time. Regardless of the resonance frequency, hydrogel AFM tips outlasted silicon counterparts during the continuous dynamic-mode imaging on a porous silicon substrate at same free vibration amplitudes (10 or 20 nm), amplitude set-point (80% of the free amplitude), and scan rate (1 Hz). The wear-resistant characteristics of hydrogel tips were also observed during the sequential dynamic-mode imaging at varying scan rates (1~50 Hz). When the hydrogel tip was appreciably damaged especially during contact-mode imaging, the worn hydrogel tip attached to a silicon microcantilever could be simply removed by Piranha cleaning and a new hydrogel tip could be attached again. This tip regeneration is an exclusive cost-effective feature of silicon microcantilevers with a hydrogel tip attached which is beneficial to resource-limited or educational settings.
양자점이 통합된 하이드로젤 탐침의 형광적색변이를 이용한 마이크로 온도 센서
김석범(Seokbeom Kim),이정철(Jungchul Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper presents a novel approach to measure local surface temperatures using fluorescent red-shift of quantum dot encapsulated in the probe tip. The designed temperature sensor was fabricated with a photo-curable hydrogel polymer (PEGDA ㎿ 250) using a mold used photo-lithography for cantilever and tip fabrication. Then, the fabricated sensor was calibrated between reference temperatures and fluorescent red-shifted wavelength from the quantum dot encapsulated tip by contacting when external ITO (Indium Thin Oxide) coated glass was under Joule heating. Then, the sensor measured the red-shifted wavelength of emitted fluorescent from the sample and calibrated to the temperature using pre-calculated data. The proposed optical based micro thermal sensor had 0.13 ㎛² area resolution from 200 ㎚ tip radius and 15.33 ℃/㎚ temperature measurement resolution. Since the tip was consist of soft polymer material and well encapsulated in the water, the sensor will give a new way to a novel micro thermal sensing for research about bioapplication for measuring a surface temperature of cell as soft-matter in water-rich condition.