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Chinese Physics B 2016年第5期25卷 429-433页

作者： A Kumaresh R Arun Kumar N Ravikumar U Madhusoodanan B S Panigrahi K Marimuthu M Anuradha grd centre for materials research PSG College of TechnologyCoimbatoreIndia Department of Physics PSG College of TechnologyCoimbatoreIndia Radiation Safety Division Indira Gandhi Centre for Atomic ResearchKalpakkamIndia Department of Physics Gandhigram Rural UniversityDindigulIndia PSG Institute of Advanced Studies CoimbatoreIndia

Rare earth europium（Eu（3＋））-doped lithium tetraborate（Eu：Li_2B_4O_7） crystal is grown from its stoichiometric melt by microtube Czochralski pulling technique（μT-Cz） for the first time. The grown crystals are subjected to powder x-ray diffraction（PXRD） analysis which reveals the tetragonal crystal structure of the crystals. UV–vis–NIR spectral analysis is carried out to study the optical characteristics of the grown crystals. The crystal is transparent in the entire visible region, and the lower cutoff is observed to be at 304 nm. The existence of BO_3 and BO_4 bonding structure and the molecular associations are analyzed by Fourier transform infrared（FTIR） spectroscopy. The results of excitation and emission-photoluminescence spectra of europium ion incorporated in lithium tetraborate（LTB） single crystal reveal that the observations of peaks at 258,297, and 318 nm in the excitation spectra and peaks at 579, 591, 597, 613, and 651 nm are observed in the emission *** chromaticity coordinates are calculated from the emission spectra, and the emission intensity of the grown crystal is characterized through a CIE 1931（Commission International d＇Eclairage） color chromaticity diagram.

关键词： crystal growth optical material growth from melt photoluminescence study

Grain boundary effect on structural, optical, and electrical properties of sol-gel synthesized Fe-doped SnO_(2) nanoparticles

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Chinese Physics B 2021年第4期30卷 555-564页

作者： Archana V Lakshmi Mohan Kathirvel P Saravanakumar S Department of Sciences Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia research and Development Center Bharathiar UniversityCoimbatore-641046TamilnaduIndia grd Center for materials research Department of PhysicsP S G College of TechnologyCoimbatore-641004TamilnaduIndia Department of Physics N S S CollegePandalam-689501KeralaIndia

Tin oxide(SnO_(2)) and iron-doped tin oxide(Sn_(1-x)Fe_(x)O_(2),x=0.05 wt%,0.10 wt%) nanoparticles are synthesized by the simple sol-gel *** structural characterization using x-ray diffraction(XRD) confirms tetragonal rutile phases of the *** variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the *** compressive strain present in the lattice estimated by using peak profile analysis through using Williamson-Hall plot also exhibits the influence of grain boundary formation in the *** radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum(PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary *** spectrum and the morphological analysis by using a field emission scanning electron microscope(FESEM) also indicate the formation of grain *** compositional analysis by using energy dispersive x-ray spectrum(EDAX) confirms Fe in the SnO_(2) *** conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing,which makes the Sn_(1-x)Fe_(x)O_(2) a potential candidate for device applications.

关键词： sol-gel compressive strain grain boundary AC conductivity

The biological potentials of substituted 1,2-diazines: a review on versatile pyridazine derivatives

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Journal of Chinese Pharmaceutical Sciences 2016年第10期25卷 707-725页

作者： Mohammad Asif Department of Pharmacy GRD (PG) Institute of Management and Technology

Many studies have been performed on the pyridazine(1,2-diazine) derivatives in the past decade. This heterocyclic nucleus possesses almost all types of pharmacological activities. This small and simple pyridazine nucleus is present in various compounds that are involved in the research aiming to evaluate new compounds with interesting biological activities, including anti-bacterial, anti-fungal, anti-viral, analgesic, anti-inflammatory, anti-platelets, anti-ulcer, anti-secretory, anti-depressants, anxiolytics, sedative-hypnotics, anti-convulsant, anti-tumor, anti-thrombotics, cardiotonics, vasodilatators, anti-arrhythmics, anti-diabetic, anti-tubercular agents and so on. This review focuses on the pyridazine derivatives with potential activities that have been developed. Pyridazine compounds draw attention of scientists and researchers because of their diverse biological activities as well as simple chemical and easy functionalization at various ring positions, making them attractive synthetic building blocks for designing and development of novel pyridazinone-based therapeutic agents.

关键词： Pyridazines Heterocyclic Pharmacological activities

Effect of Air Plasma Processing on the Adsorption Behaviour of Bovine Serum Albumin on Spin-Coated PMMA Surfaces

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Journal of Bionic Engineering 2008年第3期5卷 204-214页

作者： Chaozong Liu Brian J. Meenan Advanced materials and Biomaterials research centre School of Engineering The Robert Gordon University Aberdeen ABIO 1FR UK Northern ireland Bioengineering centre University of Ulster Newtownabbey BT37 OQB Northern Ireland UK

This paper reports the adsorption of Bovine Serum Albumin （BSA） onto Dielectric Barrier Discharge （DBD） processed Poly（methyl methacrylate）（PMMA） surfaces by a Quartz Crystal Microbalance with Dissipation monitoring （QCM-D） technique. The purpose is to study the influence of DBD processing on the nature and scale of BSA adsorption on PMMA surface in vitro. It was observed that DBD processing improves the surface wettability of PMMA film, a fact attributable to the changes in surface chemistry and topography. Exposure of the PMMA to Phosphate Buffed Saline （PBS） solution in the QCM-D system resulted in surface adsorption which reaches an equilibrium after about 30 minutes for pristine PMMA, and 90 minutes for processed PMMA surface. Subsequent injection of BSA in PBS indicated that the protein is immediately adsorbed onto the PMMA surface. It was revealed that adsorption behaviour of BSA on pristine PMMA differs from that on processed PMMA surface. A slower adsorption kinetics was observed for pristine PMMA surface, whilst a quick adsorption kinetics for processed PMMA. Moreover, the dissipation shift of protein adsorption suggested that BSA forms a more rigid structure on pristine PMMA surface that on processed surface. These data suggest that changes in wettability and attendant chemical properties and surface texture of the PMMA surface may play a significant role in BSA adsorption process.

关键词： in vitro test protein adsorption surface modification polymethylmethacrylate QCM-D

Statistical Models for Condition Monitoring and State of Health Estimation of Lithium-Ion Batteries for Ships

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Journal of Dynamics, Monitoring and Diagnostics 2024年第1期3卷 11-20页

作者： Erik Vanem Qin Liang Maximilian Bruch Gjermund Bøthun Katrine Bruvik Kristian Thorbjørnsen Azzeddine Bakdi DNV grd HøvikNorway Department of Mathematics University of OsloOsloNorway Fraunhofer ISE FreiburgGermany Corvus Energy BergenNorway Corvus Energy PorsgrunnNorway

Battery systems are increasingly being used for powering ocean going ships,and the number of fully electric or hybrid ships relying on battery power for propulsion is *** ensure the safety of such ships,it is important to monitor the available energy that can be stored in the batteries,and classification societies typically require the state of health(SOH)to be verified by independent *** paper addresses statistical modeling of SOH for maritime lithium-ion batteries based on operational sensor *** methods for sensor-based,data-driven degradation monitoring will be presented,and advantages and challenges with the different approaches will be *** different approaches include cumulative degradation models and snapshot models,models that need to be trained and models that need no prior training,and pure data-driven models and physics-informed *** of the methods only rely on measured data,such as current,voltage,and temperature,whereas others rely on derived quantities such as state of *** include simple statistical models and more complicated machine learning *** from this exploration will be important in establishing a framework for data-driven diagnostics and prognostics of maritime battery systems within the scope of classification societies.

关键词： battery condition monitoring data-driven analytics diagnostics state of health

Enhancement of luminescence intensity and spectroscopic analysis of Eu^(3+) activated and Li^+ charge-compensated Bi_2O_3 nanophosphors for solid-state lighting

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Journal of Rare Earths 2019年第4期37卷 356-364页

作者： S.Ashwini S.C.Prashantha RamachANDra Naik H.Nagabhushana Department of Physics Channabasaveshwara Institute of Technology research Center Department of Science East West Institute of Technology Department of Physics New Horizon College of Engineering CNR Rao Center for Advanced materials Tumkur University

The present work reports the synthesis, characterization, photoluminescence and photocatalytic activity of Eu^(3+)(1 mol%-11 mol%) doped and Li^+(0.5 mol%-5 mol%) co-doped Bi_2 O_3 nanophosphors(NPs) by sonochemical method. The average particle size was estimated using powder X-ray diffraction(PXRD)and transmission electron microscopy(TEM) and is found to be in the range of 30-35 nm. The scanning electron microscopy(SEM) images were highly dependent on sonication time and concentration of epigallocatechin gallate(EGCG) bio-surfactant. The energy gap of doped and co-doped Bi_2 O_3 nanophosphors was estimated using Kubelka-Munk(K-M) function and is found to be in the range of2.9-3.08 eV. The effect of Li+ co-doping on luminescence of optimized Bi_2 O_3:Eu^(3+) was studied and is found about more than 3 fold enhancement of emission intensity. Judd-Ofelt parameters(Ω_2, Ω_4 and Ω_6).transition probabilities(A_T), quantum efficiency(η), luminescence lifetime(τ_(rad)), color chromaticity coordinates(CIE) and correlated color temperature(CCT) values were estimated from the emission spectra and are discussed in detail. The estimated CIE chromaticity co-ordinates are very close to the NTSC(National Television Standard Committee) standard value of red emission. The synthesized NPs show excellent photocatalytic activity of acid red-88 under UV-light irradiation, which can degrade 98.1% in60 min. The decreasing electron-hole pair recombination rate with quick electron transfer ability is predominantly ascribed to the balance between crystallite size, morphology, band gap, defects, surface area, etc. These results show a light for the use of sonochemical route of Bi_2 O_3:Eu^(3+):Li^+ in solid state display and photocatalytic applications.

关键词： Bi2O3:Eu3+:Li+ Sonochemical Photoluminescence CIE n CCT Photocatalysis Rare earths

Rational design of monovalent ions （Li,Na,K） co-doped ZnAl2O4:Eu3+ nanocrystals enabling versatile robust latent fingerprint visualization

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Journal of Rare Earths 2019年第7期37卷 699-705页

作者： F.Femila Komahal H.Nagabhushana R.B.Basavaraj G.P.Darshan Hajeebaba K.Inamdar S.C.Sharma B.Daruka Prasad C.N.R.Rao centre for Advanced materials research Tumkur UniversityTumkur-572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore-560 107India Department of Physics J.B.Institute of Engineering&Technology(Autonomous)MoinabadPR.DistrictHyderabad-75India National Assessment and Accreditation Council Bangalore 560 072India Department of Physics B.M.S.Institute of TechnologyVisveswaraya Technological UniversityBangalore 560064India

Alkali metal ions(M+ = Na+,Li+,K+) co-doped ZnAl2O4:Eu3+(5 mol%)(ZAE) nanopowders(NPs) were prepared via solution combustion route using Mimosa pudica(MP) leaves extract as a fuel. PXRD results of co-doped samples enhance the crystallinity and grain growth. Photoluminescence(PL) of the prepared ZAE and ZAE:M+(M+ = Na+, Li+, K+) NPs shows intense emission peaks in the range of 550-750 nm and ascribed to 5D0→7FJ(J=0-4) transitions of Eu3+ ions, respectively. A 2-fold enhancement in PL intensity was observed in Li+ co-doped samples. The optimized ZnAl2O4:Eu3+(5 mol%), Li+(1 wt%)(ZAEL)NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces through robust powder dusting technique. The visualized latent fingerprints(LFPs) reveal well defined level 1-3 ridge characteristics under several tests such as fingerprint aging and fresh water treatment for various time durations. The obtained results clearly evidence that the prepared NPs are quite useful for multifunctional applications such as advanced forensic and solid state lightning.

关键词： Photoluminescence Latent fingerprints Solid state lightning Alkali metal ions Rare earths

Multifunctional Dy(Ⅲ)doped di-calcium silicate array for boosting display and forensic applications

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Journal of Rare Earths 2018年第7期36卷 690-702页

作者： M.Venkataravanappa R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma P.Hema Prabha S.Ramani H.Nagabhushana Department of Physics Govt.First Grade CollegeSiraTumkur 572 137India research and Development Center Bharathiar UniversityCoimbatore 641 046India Prof.CN.R.Rao centre for Advanced materials research Tumkur UniversityTumkur 572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore 560 107India Department of Physics BMS Institute of Technology and ManagementVTU-afflliatedBangalore 560 064India Department of Mechanical Engineering Jain UniversityJain Group of InstitutionsBangalore 560 069India Avinashilingam Institute for Home Science and Higher Education for Women University Coimbatore 6410 43India Department of Food Processing and Preservation Technology Avinashilingam Institute for Home Science and Higher Education for Women UniversityCoimbatore 641043India

Latent fingerprints（LFPs） are the major physical evidences for the identification of individuals during crime spot investigation. Till date, numerous methods were followed to visualize LFPs. However, simple,accurate, and cost-effective method has wide scope in advanced forensic field. In our work, Ca2 SiO4：Dy^（3＋）nanopowders（NPs） were fabricated via solution combustion route. The optimized sample was employed for the visualization of overlapped LFPs by the cost effective powder dusting method. The obtained results reveals the complete three levels of ridge characteristics with high sensitivity, reproducibility,selectivity, and reliability on various complex surfaces. The photoluminescence（PL） spectra consist of intense peaks at ～ 480 and 574 nm owing to ~4 F（9/2） →~6 H（15/2） and ~4 F（9/2）→~6 H（13/2） 4 f transitions of Dy3＋ ions,respectively. The photometric properties confirm that the samples exhibit intense white emission with high color purity. Therefore, the prepared NPs could be a definitive choice as an advanced luminescent NPs for forensic, solid state lighting and portable FED devices.

关键词： Solution combustion Photoluminescence Solid state lighting Fingerprint patterns Sweat pores Rare earths

Comparative Electrocatalytic Oxygen Evolution Reaction Studies of Spinel NiFe_(2)O_(4) and Its Nanocarbon Hybrids

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Transactions of Tianjin University 2022年第1期28卷 80-88页

作者： Pratik V.Shinde Rutuparna Samal Chandra Sekhar Rout centre for Nano and Material Sciences Jain UniversityBengaluruKarnataka 562112India

Electrocatalytic oxygen evolution reaction(OER)is one of the crucial reactions for converting renewable electricity into chemical fuel in the form of *** date,there is still a challenge in designing ideal cost-effective OER catalysts with excellent activity and robust *** hybridization of transition metal oxides and carbonaceous materials is one of the most effective and promising strategies to develop high-performance ***,this work synthesized hybrids of NiFe_2 O_4 spinel materials with two-dimensional(2D)graphene oxide and one-dimensional(1 D)carbon nanotubes using a facile solvothermal *** activities of NiFe_(2)O_(4) with 2 D graphene oxide toward OER were realized to be superior even to the 1 D carbon nanotube-based electro catalyst in terms of overpotential to reach a current density of10 mA/cm^(2) as well as Tafel *** NiFe_(2)O_(4) with 2 D graphene oxide hybrid exhibits good stability with an overpotential of 327 mV at a current density of 10 mA/cm^(2) and a Tafel slope of 103 mV/*** high performance of NiFe_(2)O_(4) with 2 D graphene oxide is mainly attributed to its unique morphology,more exposed active sites,and a porous structure with a high surface ***,an approach of hybridizing a metal oxide with a carbonaceous material offers an attractive platform for developing an efficient electrocatalyst for water electrochemistry applications.

关键词： Oxygen evolution reaction Metal oxide Graphene oxide Carbon nanotubes Stability

Recent developments in self-powered smart chemical sensors for wearable electronics

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Nano research 2021年第11期14卷 3669-3689页

作者： Aaryashree Surjit Sahoo Pravin Walke Saroj Kumar Nayak Chandra Sekhar Rout Dattatray J.Late Shibaura Institute of Technology Koto-CityTokyo135-8548Japan School of Basic Sciences Indian Institute of Technology BhubaneswarJatniOdisha752050India National centre for Nanosciences and Nanotechnology University of MumbaiMumbaiMaharashtra400098India centre for Nano and Material Sciences Jain UniversityRamanagaramBangalore562112India centre for Nanoscience&Nanotechnology Amity University MaharashtraMumbai-Pune ExpresswayBhatanPost—SomathnePanvelMaharashtra410206India

The next generation of electronics technology is purely going to be based on wearable sensing systems. Wearable electronic sensors that can operate in a continuous and sustainable manner without the need of an external power sources, are essential for portable and mobile electronic applications. In this review article, the recent progress and advantages of wearable self-powered smart chemical sensors systems for wearable electronics are presented. An overview of various modes of energy conversion and storage technologies for self-powered devices is provided. Self-powered chemical sensors (SPCS) systems with integrated energy units are then discussed, separated as solar cell-based SPCS, triboelectric nano-generators based SPCS, piezoelectric nano-generators based SPCS, energy storage device based SPCS, and thermal energy-based SPCS. Finally, the outlook on future prospects of wearable chemical sensors in self-powered sensing systems is addressed.

关键词： chemical sensors self-powered wearable electronics smart sensors