http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Photoconducting properties of a unit nanostructure of ZnO assembled between microelectrodes.
Kulkarni, Atul,Wahab, Rizwan,Ansari, S G,Kim, Tae-Sung,Al-Deyab, Salem S,Ansari, Z A American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.3
<P>The photoconducting properties of a unit microflower of zinc oxide are investigated as a function of wavelength from UV to IR region at constant illumination intensity. Synthesized flowers were trapped in 2 microm gap, between pre-prepared gold microelectrodes, using AC dielectrophoresis. Photocurrent drastically increases upon illumination in the UV region, whereas it gradually reduces when irradiated in visible and IR region. Higher photoconductivity in UV region is correlated to band to band transition upon illumination. In visible region, deep level transitions are expected which intern exhibits comparatively low photocurrent. Photoconduction in IR region is only due to the adsorbed surface oxygen species. This investigation suggests the potential application of ZnO nanostructures for various optoelectronic device applications.</P>
The plastic optical fiber cantilever beam as a force sensor
Kulkarni, Atul,Na, Jeonggil,Kim, Youngjin,Kim, Taesung Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.4
<P>This study reports use of inexpensive intensity-based plastic optical fiber (POF) in the form of cantilever beam to monitor the force. The cantilever consists of POF surface bonded on the surface of metal beams viz. spring steel (SS) and mild steel (MS) and subjected to force. The performance of the force sensor is evaluated during macro-bending caused because of the deflection of the beam by applied force. Experimentally obtained detector output of POF, which could be measured with negligible hysteresis is compared with finite element analysis in the range between 0.0098 and 19.613 N. The reproducibility of the sensor is observed in the limit of ±1%. The proposed sensor can replace stain gauge load cell to certain extent in some applications. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1020–1023, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24217</P>
A novel method for large area graphene transfer on the polymer optical fiber.
Kulkarni, Atul,Kim, Hyeongkeun,Amin, Rashid,Park, Sung Ha,Hong, Byung Hee,Kim, Taesung American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.5
<P>We develop two simple methods-the dip coat stamping and lift-off methods-to transfer large area, high quality graphene films onto the top and side faces of the polymer optical fiber. The graphene films can be synthesized using chemical vapor deposition method on large Cu foils. After synthesis, the graphene films are characterized by scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The polymer optical fiber probe with the transferred graphene film can be used as a chemical sensor for the detection of various organic aerosols.</P>
조재호,Atul Kulkarni,김호중,Jin Uk Yoon,성재혁,유일재,김태성 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.11
Silver nanoparticles are among the fastest growing product categories in the nanotechnology industry. Several experimental studies reported earlier for its toxicity and its associated risks. Uniform distribution of nanoparticle concentration in inhalation toxicity exposure chambers is important in the conduct of inhalation experimental evaluation. However, relatively little is known. Several factors, including nanoparticle size, degree of mixing, and chamber design, may influence the nanoparticles distribution in whole-body exposure chamber. In the present work we investigated numerically the silver nanoparticles concentration distribution and particle trajectory in the whole body inhalation toxicity test chamber. A three dimensional numerical simulation was performed using the commercially available computational fluid dynamics code Fluent with two models, discrete phase model (DPM) and fine particle model (FPM) to calculate spatial particle trajectories and concentration. The simulated results show that the silver nanoparticle trajectories and concentration distribution are dependent on inhalation toxicity chamber geometry.
Highly efficient in-line wet cyclone air sampler for airborne virus detection
성기운,안치성,Atul Kulkarni,신원규,김태성 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
Early detection of highly pathogenic strains is particularly important from the point of view of controlling and minimizing the spread of the virus. Wherein, the sampling of infectious virus from air is a crucial step for effective pandemic disease diagnosis. However, most of the air samplers required long sampling time and real time virus analysis is not possible. Hence, the present work we report design and development of in-line virus detection system by adopting newly designed wet cyclone air sampler. An in line airborne virus detection system composed of preseparator and wet cyclone type impactor for air sampling, fluidics system, and virus sensing platform. All virus detection processes, such as sampling of air, hydration, delivery, and immunoassay were carried out on a single system without any preor post-sample treatment. Prior to virus detection, the collection efficiency @ 1000 L/min is tested with PSL particles and is observed that the air sampler efficiency for 1 µm AD is about 50 %, 1.5 µm AD is 78.3 %. And for the large size PSL the observed collection efficiency is about 100 %. Further, it is observed that, the developed system is capable of efficient collection of airborne viral pathogens such as H1N1 and H3N2.
Controlled Synthesis of Horizontal Silicon Nanowires for Biosensor Application
안지상,문지훈,Atul Kulkarni,Yinhua Jin,성기운,이민호,김태성,김광수 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
Top-down silicon nanowire (SiNW) fabrication mechanisms for connecting electrodes are widely utilized because they provide good control of the diameter to length ratio. The representative mechanism for the synthesis of SiNWs, a top-down approach, has limitations on the control of their diameter following lithography technologies, requires a long manufacturing process and is not cost-effective. In this study, we have implemented the bottom-up growth of horizontal SiNWs (H-SiNWs) on Si/SiO2 substrates directly by plasma enhanced chemical vapor deposition (PECVD) under about 400℃. The HAuCl4 solution as a catalyst and SiH4 gas as a precursor are used for the synthesis of H-SiNWs. After optimization of synthesis conditions, we evaluated the photoelectric properties of the H-SiNWs under illumination with different light intensities. Further, we demonstrated the feasibility of H-SiNW devices for the detection of biotinylated DNA nanostructures and streptavidin interaction.