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Your search keyword '"Gupta, S. K."' showing total 2 results
2 results on '"Gupta, S. K."'

1. Hierarchical Nano Heterostructures of SnO2-WOX: Growth and Sensing Studies.

Author

Kanitkar, Prajakta, Sen, Shashwati, Muthe, K. P., Aiyer, R. C., and Gupta, S. K.

Subjects
*HETEROSTRUCTURES, *TRANSMISSION electron microscopy, *NANOWIRES, *CHLORINE, *ULTRAVIOLET radiation, *DETECTORS
Abstract

SnO2-WOX nanowire heterostructure were grown by physical deposition method. Characterization by XRD, UV-Vis and TEM shows that both the nanowire systems do not interact with each other, and retain their individual characteristic. Sensors fabricated from both, mat films and single isolated nanowire shows response to chlorine as well as H2S gas at room temperature. Single nanowire sensors are found to be better sensitive as well as selective Cl2 sensor. [ABSTRACT FROM AUTHOR]

Published
2010
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2. ZnO Nanowires As H2S Sensor.

Author

Ramgir, N. S., Rikka, V., Kaur, M., Ganapathi, S. Kailasa, Mishra, S. K., Datta, N., Aswal, D. K., Gupta, S. K., and Yakhmi, J. V.

Subjects
*ZINC oxide, *NANOWIRES, *DETECTORS, *HYDROGEN sulfide, *CRYSTAL growth, *PHOTOLUMINESCENCE, *NANOPARTICLES, *SEMICONDUCTORS
Abstract

Hydrothermal growth of ZnO nanowires were performed using ZnO nanoparticles as a seed layer. The growth was found to depend strongly on the reaction duration. These nanowires detected H2S with faster response and recovery time of 13 and 78 s, respectively towards 20 ppm at 350° C. The lowest detection limit was improved to 0.6 ppm upon annealing in O2 flow of 50 sccm. The response time was further improved to just 6 s towards 20 ppm of H2S at 350° C. The enhanced response characteristics have been attributed to the high surface area to volume ratio of nanowires. Photoluminescence (PL) studies showed increase in the green emission related to defect states in ZnO. This is also expected to contribute for the improved sensing characteristics. [ABSTRACT FROM AUTHOR]

Published
2010
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