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- 저자 : Vedala (검색결과 3 건)
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전민현,Harindra Vedala,김태형,최원봉,최현광,Sookhyun Hwang 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.2
In this study, we fabricated and electrochemically characterized two types of individual carbon nanotube electrodes: an as-produced multi-walled carbon nanotube (MWNT) electrode and a modified MWNT electrode. As-produced MWNTs were electrically contacted with Au/Ti layers using nanolithography and RF magnetron sputtering. Open-ended modified MWNT electrodes were fabricated by reactive ion etching treatment under oxygen atmosphere. We also performed cyclic voltammetry measurements for detecting aqueous dopamine solutions with different concentrations. We found that an individual MWNT electrode, which has a small effective area, shows good electrochemical performance. The electrocatalytic behavior of the modified electrode, which had "broken" open ends were better than that of the as-produced electrode with respect to sensitivity. The modified electrode is capable of detecting dopamine at the picomolar level. Therefore, an individual modified MWNT electrode has potential for application to active components in nanobiosensors.
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Exploring the Chemical Sensitivity of a Carbon Nanotube/Green Tea Composite
Chen, Yanan,Lee, Yang Doo,Vedala, Harindra,Allen, Brett L.,Star, Alexander American Chemical Society 2010 ACS NANO Vol.4 No.11
<P>Single-walled carbon nanotubes (SWNTs) possess unique electronic and physical properties, which make them very attractive for a wide range of applications. In particular, SWNTs and their composites have shown a great potential for chemical and biological sensing. Green tea, or more specifically its main antioxidant component, epigallocatechin gallate (EGCG), has been found to disperse SWNTs in water. However, the chemical sensitivity of this SWNT/green tea (SWNT/EGCG) composite remained unexplored. With EGCG present, this SWNT composite should have strong antioxidant properties and thus respond to reactive oxygen species (ROS). Here we report on fabrication and characterization of SWNT/EGCG thin films and the measurement of their relative conductance as a function of H<SUB>2</SUB>O<SUB>2</SUB> concentrations. We further investigated the sensing mechanism by Fourier transform infrared (FTIR) spectroscopy and field-effect transistor measurements (FET). We propose here that the response to H<SUB>2</SUB>O<SUB>2</SUB> arises from the oxidation of EGCG in the composite. These findings suggest that SWNT/green tea composite has a great potential for developing simple resistivity-based sensors.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-11/nn100988t/production/images/medium/nn-2010-00988t_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn100988t'>ACS Electronic Supporting Info</A></P>
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Rebello, Nalini E.,Shivashankar, R.,Sastry, Vedala R. Techno-Press 2018 Geomechanics & engineering Vol.15 No.2
This paper presents the results of numerical modeling studies on the effect of displacements of tunneling in granular soils. Presence of building loads is considered, to find displacement generated at the surface on tunnel. Effect of varying eccentricities of building is simulated, to find influence of building on vertical and horizontal displacement. Studies were carried out in two cases of with and without a geosynthetic layer installed at the bottom of the footing. Results of analysis revealed, the presence of geosynthetic layer under footing, with building placed on centre line, reduced the surface displacements compared to displacement generated without geosynthetic layer. Presence of geosynthetic layer under footing had a dominant effect in reducing displacements in high storey structures. However, when the building was shifted to greater eccentricities from centre line, presence of geosynthetic layer, led to insignificant reduction of displacements on the centre line at the surface.
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