Kongu Engineering College

About: Kongu Engineering College is a based out in . It is known for research contribution in the topics: Computer science & Cluster analysis. The organization has 2001 authors who have published 1978 publications receiving 16923 citations.

Carbon-based Multi-layered Films for Electronic Application: A Review

Abstract: The current article reviews the construction of thin films comprising carbon-based nanomaterials for application in electrical and electronic fields. Carbon-based materials such as carbon nanotubes, graphene, and fullerene are known to possess excellent electrical and electronic properties, which makes them desirable materials for the fabrication of micro- and nano-electromechanical devices. The fabrication process of thin films, including the deposition of several layers, removal of layers, solution processing methods, inkjet printing, micro-emulsion polymerization methods, deposition through filtration processes, spin coating, dip coating, pen lithography, vacuum-assisted flocculation, vacuum-assisted layer-by-layer assembly laser writing, etc., has been extensively reviewed. It is evident from the past findings that the fabricated thin films constituting carbon nanomaterials shows predominant alteration in electrical and electronic properties like sheet resistance, ionic transport, potential difference, conductivity, electro-rheological, transparency, trans-conductance, transmittance, bending stability, etc. In view of the referred properties, the developed materials find wide applications in charge-trap flash memories, flexible organic resistive memory devices, photovoltaic devices, flexible and transparent electronics, heat sinks in electronic materials, liquid crystal displays (LCDs), thin-film solar cells, flexible touch-screen panels, electronic papers, micro-batteries, electrochemical micro-capacitors, humidity sensors, optoelectronic devices, etc. We expect that the current review article will be a valuable asset for the researchers working in the field of carbon nanomaterials.

Digital switching scheme for cascaded multilevel inverters

Abstract: In this paper, a new digital switching technique for cascaded H bridge multilevel inverter (CMLI) for the purpose of power quality improvement is proposed in order to ensure an efficient voltage utilization and better harmonic spectrum. The method presented shows a topology to control cascaded multilevel inverter that is implemented with multiple DC sources to get 2n+1−1 levels. Whereas a standard cascade multilevel inverter requires n DC sources or n number of transformers for 2n+1 levels at the output, where n is the number of inverter stages. Moreover, the experimental results are carried out on a scaled down prototype to prove the effectiveness of the proposed topology. This topology of firing can be implemented without using PWM technique which considerably reduces the switching losses and also brings down the Total Harmonic Distortion (THD). Simulation and experimental results show the superiority of this technique over the conventional methods.

Green synthesis and characterization of silver nanomaterials using leaf extract of prosopis cineraria for antibacterial and anti-cancer applications

Abstract: The silver nanoparticles (AgNPs) were synthesized by biodegradable method using leaf extract of Prosopis cineraria. The green synthesized nanoparticles showed the surface plasmonic resonance peak at 441 nm which confirmed the presence of AgNPs. The phyto chemicals of Prosopis cineraria leaf extract acted as reducing agents, which were corroborated by the infrared spectrum. Electron microscopic analysis substantiate that the AgNPs were spherical in shape with an average size of 40–60 nm. The x-ray diffraction study revealed that the AgNPs were in face centered cubic crystal system. The antimicrobial activity of the synthesized AgNPs was investigated for broad spectrum of microorganisms. Also, the synthesized AgNPs were analyzed for their anticancer activity against the Lung cancer cell line (A549).

Luminescent halogen-substituted 2-(N-arylimino)pyrrolyl boron complexes: the internal heavy-atom effect

Abstract: A group of new boron complexes [BPh2{κ2N,N′-NC4H3-2-C(H)N-C6H4X}] (X = 4-Cl 4c, 4-Br 4d, 4-I 4e, 3-Br 4f, 2-Br 4g, 2-I 4h) containing different halogens as substituents in the N-aryl ring have been synthesized and characterized in terms of their molecular properties Their photophysical characteristics have been thoroughly studied in order to understand whether these complexes exhibit an internal heavy-atom effect Phosphorescence emission was found for some of the synthesized halogen-substituted boron molecules, particularly for 4g and 4h DFT and TDDFT calculations showed that the lower energy absorption band resulted from the HOMO to LUMO (π–π*) transition, except for 2-I 4h, where the HOMO−1 to LUMO transition was also involved The strong participation of iodine orbitals in HOMO−1 is reflected in the calculated absorption spectra of the iodine derivatives, especially 2-I 4h, when spin–orbit coupling (SOC) was included Organic light-emitting diodes (OLEDs) based on these complexes, in the neat form or dispersed in a matrix, were also fabricated and tested The devices based on films prepared by thermal vacuum deposition showed the best performance When neat complexes were used, a maximum luminance (Lmax) of 1812 cd m−2 was obtained, with a maximum external quantum efficiency (EQEmax) of 015% An EQEmax of ca 1% along with a maximum luminance of 494 cd m−2 were obtained for a device fabricated by co-deposition of the boron complex and a host compound (1,3-bis(N-carbazolyl)benzene, mCP)