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Author Pandiyarajan, T.; Mangalaraja, R.V.; Karthikeyan, B.; Arulraj, A.; Gracia-Pinilla, M.A.
Title Fabrication and spectroscopic investigation of sandwich-like ZnO:rGO:ZnO: rGO:ZnO structure by layer-by-layer approach Type
Year 2023 Publication Inorganic Chemistry Communications Abbreviated Journal Inorg. Chem. Commun.
Volume 149 Issue Pages 110383
Keywords Layer-by-layer; Reduced graphene oxide; ZnO; Spin coating; Transmission; Photoluminescence
Abstract Transparent conducting materials (TCMs) are the heart of modern optoelectronic industries and the properties of TCMs could be improved by the introduction of 2D carbon materials. In this report, the influence of order layering on microstructural, transparency and emission characteristics of ZnO:rGO:ZnO:rGO:ZnO and rGO:ZnO: rGO:ZnO:rGO sandwich structures has been investigated. The layer-by-layer approach has been adopted for the fabrication of sandwich structured materials ZnO:rGO:ZnO:rGO:ZnO and rGO:ZnO:rGO:ZnO:rGO through the spin coating technique. The sandwich structures of ZnO and rGO exhibited hexagonal wurtzite structure of ZnO without any impurities were identified through XRD. The ordering of layer's influenced the microstructural parameters and were significantly altered. The spherical nature of the particles and the formation of the sand-wich structures were confirmed by using SEM micrograph. The reduction in an optical transparency and nar-rowing bandgap of the ZnO upon the order of layering were identified through transmission spectra. The lower energy shift of near band edge (NBE) emission and reduction in the emission intensity with respect to pure ZnO nanostructures was observed. The present work provides a simple layer-by-layer approach to fabricating sand-wich structures and improving the optical properties which have potential applications in various optoelectronic devices.
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Series Volume Series Issue Edition
ISSN 1387-7003 ISBN Medium
Area Expedition Conference
Notes WOS:000915788900001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1723
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Author Sakthivel, P.; Mangalaraja, R.V.; Ramalingam, G.; Sakthipandi, K.; Gowtham, V.
Title Synthesis, Structure, Morphology, Element composition, Electrochemical, and Optical studies of Zn0.98-XMn0.02CeX Quantum dots Type
Year 2023 Publication Spectrochimica Acta-Part A: Molecular and Biomolecular Spectroscopy Abbreviated Journal Spectrochim. Acta A Mol. Biomol. Spectrosc.
Volume 303 Issue Pages 123140
Keywords ZnS; HR-TEM; Cyclic voltammetry; Band gap; Rare earth; Photoluminescence
Abstract Quantum dots (QDs) are semiconductors whose size falls in a range between 1 and 10 nm; they are generally known as zero-dimension materials. It finds various applications in optical industries including light-emitting diodes, display technology, imaging, and labelling. ZnS is one of the excellent QDs in its class of II-VI semiconductors. In this paper, It is reported that the preparation of Mn-doped ZnS and Mn, Ce co-doped ZnS QDs using facile co-precipitation technique. XRD and HR-TEM results confirmed the cubic structure, particle size, and phase of the synthesized particles, and the crystallite is measured as -2 nm. The surface morphology, elemental analysis, and FT-IR spectra revealed the purity of the samples and confirmed the presence of dopants as expected. Cyclic voltammetry studies expressed the electrochemical behaviour of the samples, which increased as a function of Ce3+ doping concentration. UV-visible absorbance and transmittance spectra disclosed the optical characteristics of the samples. A wide band gap (4.02 eV) was received for 2% Ce-doped Zn: MnS QDs. Week Blue and strong yellow emissions were received for 4% Ce-doped Zn:MnS QDs. Whereas, high intensity red-emission was received for 2% Ce-doped Zn:MnS QDs. The different colour emissions are discussed in terms of defects produced.
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Series Volume Series Issue Edition
ISSN 1386-1425 ISBN Medium
Area Expedition Conference
Notes WOS:001058679500001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1885
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Author Tiwari, AK.; Suozzi, E.; Silva, C.; De Maio, M.; Zanetti, M.
Title Role of Integrated Approaches in Water Resources Management: Antofagasta Region, Chile Type
Year 2021 Publication Sustainability Abbreviated Journal Sustainability
Volume 13 Issue 3 Pages 1297
Keywords hydrology; thematic maps; DEM; mines; pollution risk; GIS
Abstract Water is essential for the survival of all living beings and plays a significant role in the growth of any country ' s economy. At present, water depletion and pollution are a serious challenge due to anthropogenic, geogenic and climate change activities worldwide, including in Chile. The Antofagasta region is located in northern Chile and is the heart of its mining industry, playing a significant role in the country ' s economy. The Antofagasta region ' s main challenge is water shortage and contamination. Due to it, the region ' s local population is facing major difficulties in obtaining the necessary water for domestic, industrial, irrigation, and other uses. Therefore, a water resources management plan is essential for the region to maintain a sustainable environment. Considering the above points, significant parameters, such as slope, aspect, elevation, hillshade, drainage, drainage density and river basin-maps of the Antofagasta region prepared using the digital elevation model (DEM) data in geographic information system (GIS) environment. Besides, a pollution risk level assessment of the study area ' s cities/villages done using GIS application. The important created maps and the identification of pollution risk of cities/villages of the present study could provide significant information to policymakers and help them make a suitable water management plan for the area.
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2071-1050 ISBN Medium
Area Expedition Conference
Notes WOS:000615612700001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1333
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