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- 저자 : Dillibabu Sastikumar (검색결과 2 건)
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Growth of nanolaminate structure of tetragonal zirconia by pulsed laser deposition
Balakrishnan, Govindasamy,Kuppusami, Parasuraman,Sastikumar, Dillibabu,Song, Jung Il Springer 2013 Nanoscale research letters Vol.8 No.1
<P>Alumina/zirconia (Al<SUB>2</SUB>O<SUB>3</SUB>/ZrO<SUB>2</SUB>) multilayer thin films were deposited on Si (100) substrates at an optimized oxygen partial pressure of 3 Pa at room temperature by pulsed laser deposition. The Al<SUB>2</SUB>O<SUB>3</SUB>/ZrO<SUB>2</SUB> multilayers of 10:10, 5:10, 5:5, and 4:4 nm with 40 bilayers were deposited alternately in order to stabilize a high-temperature phase of zirconia at room temperature. All these films were characterized by X-ray diffraction (XRD), cross-sectional transmission electron microscopy (XTEM), and atomic force microscopy. The XRD studies of all the multilayer films showed only a tetragonal structure of zirconia and amorphous alumina. The high-temperature XRD studies of a typical 5:5-nm film indicated the formation of tetragonal zirconia at room temperature and high thermal stability. It was found that the critical layer thickness of zirconia is ≤10 nm, below which tetragonal zirconia is formed at room temperature. The XTEM studies on the as-deposited (Al<SUB>2</SUB>O<SUB>3</SUB>/ZrO<SUB>2</SUB>) 5:10-nm multilayer film showed distinct formation of multilayers with sharp interface and consists of mainly tetragonal phase and amorphous alumina, whereas the annealed film (5:10 nm) showed the inter-diffusion of layers at the interface.</P>
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Edakkaparamban Shuaib,Parasseri Muhammed Shafi,Yogesh Gaurav Kumar,Arumugam Chandra Bose,Dillibabu Sastikumar 한국탄소학회 2021 Carbon Letters Vol.31 No.4
In this work, a simple nonenzymatic glucose sensor has been proposed based on coconut shell charcoal (CSC) modifed nickel foil as working electrode in a three-electrode electrochemical cell. Charcoal was prepared by the pyrolysis of coconut shells. The most important advantages of coconut shells are cost-efectiveness and their abundance in nature. The morphology and phase of the CSC powder were characterized by scanning electron microscopy and X-ray difraction. The electrochemical performance of the CSC powder coated Nickel foil electrode was investigated by cyclic voltammetry and chronoamperometry. The sensor shows a higher sensitivity of 2.992 mA cm−2 mM−1 in the linear range of 0.5–5.5 mM and slightly lower sensitivity of 1.1526 mA cm−2 mM−1 in the range of 7–18.5 mM glucose concentration with a detection limit of 0.2 mM. The anti-interference property of CSC powder also was investigated and found that the response of interfering species was less signifcant compared to glucose response. The proposed sensor ofers good sensitivity, wide linear range, and a very low response to interfering biomolecules.
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