Shrabani Mondal; Rashmi Madhuri; Prashant K. Sharma
Abstract
This letter assesses the origin of linear and planer micro-structural defects in SnO2 nanoparticles through high resolution transmission electron microscopy (HRTEM). For the purpose, SnO2 nanoparticles of size 5-15 nm are synthesized by chemical co-precipitation followed by calcinations. In the low temperature ...
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This letter assesses the origin of linear and planer micro-structural defects in SnO2 nanoparticles through high resolution transmission electron microscopy (HRTEM). For the purpose, SnO2 nanoparticles of size 5-15 nm are synthesized by chemical co-precipitation followed by calcinations. In the low temperature (200°C and 400°C) calcinations range no significant evidence of micro-structural defect are observed. Whereas, SnO2 nanoparticles calcined at 600°C shows better crystallinity with multiple 1-D linear defects along with 2-D planer defects. Contribution of size and strain effect causing such circumstances is illustrated in detail. Influence of these micro-structural defects on the luminescence properties of SnO2 nanoparticles is also elaborated in detail.
Prashant K. Sharma; Ranu K. Dutta; Avinash C. Pandey
Abstract
Multifunctional magnetic nanoparticles have emerged as one of the important futuristic material for variety of applications starting from data storage, security/sensors to biomedical applications. The application of multifunctional magnetic nanoparticles in biological organisms has fashioned noteworthy ...
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Multifunctional magnetic nanoparticles have emerged as one of the important futuristic material for variety of applications starting from data storage, security/sensors to biomedical applications. The application of multifunctional magnetic nanoparticles in biological organisms has fashioned noteworthy advances in research, diagnosis and therapy of various diseases. The multifunctional magnetic nanoparticles, capable of theragnosis, drug delivery and monitoring of therapeutic response, are expected to play a significant role in the emergence of the era of personalized medicine with much of research efforts devoted toward that goal. The present review recapitulates the development of state-of-the-art multifunctional magnetic nanoparticles and the foremost applications of these multifunctional magnetic nanoparticles in magnetic targeting, drug delivery, separation, and contrast agents in magnetic resonance imaging, hyperthermia and sensors. The biocompatibility requirements and functionalization approach for multifunctional magnetic nanoparticles used in these applications are also reviewed.
Ranu K. Dutta; Prashant K. Sharma; Avinash C. Pandey
Abstract
Here is an insight into the effects of interaction of ZnO nanoparticles and the various cellular level changes that are brought about by the help of Raman spectroscopy on individual Escherichia coli cells. Raman vibrational signatures show variation in peak intensities of some of the cellular components ...
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Here is an insight into the effects of interaction of ZnO nanoparticles and the various cellular level changes that are brought about by the help of Raman spectroscopy on individual Escherichia coli cells. Raman vibrational signatures show variation in peak intensities of some of the cellular components of E coli cells with increase in nanoparticles concentration. This can be attributed to the cellular and molecular changes associated with bacterial cell growth, as the cells proceed from lag phase to stationary phase, which indicates that ZnO interferences with bacterial growth. Growth kinetics studies show mitigation in growth and colony forming units (CFU) counts. Changes in cellular morphology as investigated by atomic force microscopy and scanning electron microscopy, show destruction and even rupture of cell wall at higher ZnO concentration. This study pertains to any alterations brought about at the cellular level, which may be extended to other nanomaterials in the environment and the effect on human cells as well.
Prashant K. Sharma; Ranu K. Dutta; Avinash C. Pandey
Abstract
Spherical nanoparticles of Y2O3:Eu 3+ with cubic phase has been synthesized by solution combustion method using glycine as chelating agent and urea as fuel. The 1200 °C annealed sample yield intense red luminescence at 610 nm corresponding to 5 D0→ 7 F2 transition of Eu 3+ ion under vacuum ...
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Spherical nanoparticles of Y2O3:Eu 3+ with cubic phase has been synthesized by solution combustion method using glycine as chelating agent and urea as fuel. The 1200 °C annealed sample yield intense red luminescence at 610 nm corresponding to 5 D0→ 7 F2 transition of Eu 3+ ion under vacuum ultraviolet (VUV)/ultraviolet (UV) excitation. Furthermore, the luminescence decay time of the 5 D0→ 7 F2 transition at 610 nm was also calculated against the 147 nm VUV excitation and found to be ~ 4 ms. These highly luminescent spherical nanopartcles of Y2O3:Eu 3+ seems to be one of the promising candidates for modern age display devices.
Ravindra P. Singh; Vineet K. Shukla; Raghvendra S. Yadav; Prashant K. Sharma; Prashant K. Singh; Avinash C. Pandey
Abstract
Herein, we are reporting a novel biological approach for the formation of zinc oxide (ZnO) nanoparticles using Maddar (Calotropis procera) latex at room temperature. X-Ray diffraction (XRD) pattern reveals the formation of ZnO nanoparticles, which shows crystallinity. Transmission electron microscopy ...
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Herein, we are reporting a novel biological approach for the formation of zinc oxide (ZnO) nanoparticles using Maddar (Calotropis procera) latex at room temperature. X-Ray diffraction (XRD) pattern reveals the formation of ZnO nanoparticles, which shows crystallinity. Transmission electron microscopy (TEM) suggested particles size and shape in the range of 5-40 nm. Scanning electron microscopy (SEM) image reveals that the particles are of spherical and granular nature. UV-Vis absorption shows characteristic absorption peak of ZnO nanoparticles. Photoluminescence (PL) studies were performed to emphasize its emission properties. This simple and cost-effective biological approach for the formation of ZnO NPs has a promising application in biosensing, electronics and photonics.
