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      • Instant biosynthesis of silver nanoparticles using <i>Lawsonia inermis</i> leaf extract: Innate catalytic, antimicrobial and antioxidant activities

        Ajitha, B.,Reddy, Y. Ashok Kumar,Reddy, P. Sreedhara,Suneetha, Y.,Jeon, Hwan-Jin,Ahn, Chi Won Elsevier 2016 Journal of molecular liquids Vol.219 No.-

        <P><B>Abstract</B></P> <P>New and innovative strategies are of potential interest for the synthesis of silver nanoparticles (AgNPs), which are used in huge range of consumer products. The present work is focused on bio-fabrication of AgNPs in single step employing <I>Lawsonia inermis</I> and evaluation of their antimicrobial, antioxidant and catalytic properties. The prepared AgNPs are highly stable and monitored through UV–Vis spectrophotometer. X-ray diffraction (XRD) and the selected area electron diffraction (SAED) patterns proved the crystalline nature of AgNPs with face-centered cubic (fcc) geometry. Morphological images confirm the uniform distribution of spherical nanoparticles. Fourier transform infrared spectroscopy (FTIR) result expounds the functional groups of a leaf extract responsible for the bio-reduction of silver ions and their interaction between them. The synthesized AgNPs show potent catalytic activity in the degradation of anthropogenic pollutant (4-nitrophenol) by excess of NaBH<SUB>4</SUB>. The biosynthesized AgNPs seem to exhibit effective antibacterial, antifungal properties and further more possess potent antioxidant and DNA protective activities. At last, the current study illustrated the potential use of <I>L. inermis</I> as a novel source for AgNPs synthesis and their pronounced applicability in biomedical field.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Lawsonia inermis</I> is an exceptional sink for biosynthesis of silver nanoparticles. </LI> <LI> Biomolecules of leaf extract are found to play active role in AgNPs formation. </LI> <LI> Zeta potential value attested the higher stability of biosynthesized AgNPs. </LI> <LI> Potent catalytic, antimicrobial and antioxidant activities are perceived. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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        Design and performance analysis of smart photonic sensors for industrial applications

        S Poonguzhali,Sivasangari A.,Ajitha P.,Lalithakumari S.,Sridevi A.,Danasegaran Sathish Kumar 한국물리학회 2022 Current Applied Physics Vol.39 No.-

        Toxic gas has a median fatal concentration in the oxygen of much more than 200 parts per million (ppm) but far less than 2000 ppm by volume of gas. Many industries, mines and thermal plants emit perilous gases that are more harmful to our human life. The Proposed nanosensor senses the various perilous gases and averts many accidents. In this paper, a two-dimensional Photonic Crystal (2D-PhC) resonator and PhC-based poisonous gas sensor based on the hexagonal and square crystal lattice are built-in smart way. The PhCs are artificial constructs of any material with an occasional enunciation of refractive index (RI). It has effective light manipulation and it would be helpful to obtain light migration in the handling of sensing applications. The TE/TM wave transmission can shift as per the RI value of different gases in the PhCs. The wavelength variations obtained agree well with the Finite Difference Time Domain (FDTD) study, and the simulation is performed by the tool RSoft. The spectral variables such as quality factor (QF), sensitivity (Se), transmitted output power and detection limit (DL) are evaluated using the RI value over the spectrum of different toxic gases. The proposed square crystal structure have acquired a QF range of 500.6, high efficiency of 99%, and a better Se of 716.6 nm/RIU at 1502 nm. The designed hexagonal crystal structure have acquired a QF range of 165.8, high efficiency of 99%, and a better Se of 798.24 nm/RIU at 1630 nm respectively. The DL for both the proposed sensors is very low. So, the designed smart sensor helps promptly recognize the contaminated gases in several places. The proposed nanosensor is helpful in industrial safety, health care applications, aerospace, agricultural, transportation, environmental monitoring, thermal plants and mines.

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        Effect of Substrate Temperature on Structural, Optical and Electrical Properties of Sputtered NiO-Ag Nanocrystalline Thin Films

        Y. Ashok Kumar Reddy,B. Ajitha,P. Sreedhara Reddy,프라탑 렙디,이정희 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5

        NiO-Ag thin films were deposited on Corning 7059 glass substrates by DC reactive magnetron sputtering technique and investigated the substrate temperature (Ts) dependent properties of NiO-Ag thin films. X-ray diffraction results showed that crystalline films can be obtained at high Ts and all films have a preferred crystal growth texture with face centered cubic (fcc) structure and was also confirmed by Raman studies. The grain size, transmittance, band gap, mobility and carrier concentrations were increased with Ts. Room temperature deposited films have an average roughness around 6.9 nm where as increment of Ts resulted in increased roughness up to 14 nm with nanocrystalline morphology. The optimum substrate temperature to obtain NiO-Ag films was found to be 200°C. It was found that with increasing the Ts, resistivity of the films was significantly decreased.

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