ABSTRACT We prepare of ZnO quantum dots embedded in polyvinylpyrrolidone (PVP) matrix and report it’s working as ethanol sensor. The samples have been prepared via quenching technique where bulk ZnO powder is calcined at very high temperature of 1200°C and then quenched into ice cold polyvinylpyrrolidone solution. Thee acteiut the samples specimen have been characterized by using UV/VIS spectroscopy, X-ray diffracttion study and high resolution transmission electron microscopy (HRTEM). These studies indicate the sizes of quantum dots to be within 10 nm. The prepared quantum dot samples have been examined for ethanol vapour sensing by exploring the variation of their resistance with time at different operating temperatures. It has been revealed that ZnO quantum dots can sense ethanol at low operating (230°C) temperature with less response time.
Cite this paper
nullM. Choudhury, S. Nath and R. Nath, "ZnO: PVP Quantum Dot Ethanol Sensor," Journal of Sensor Technology, Vol. 1 No. 3, 2011, pp. 86-90. doi: 10.4236/jst.2011.13012.
 S. S. Nath, M. Choudhury, D. Chakder, G. Gope and R. K. Nath, “Acetone Sensing Property of ZnO Quantum Dots Embedded on PVP,” Sensors and Actuators B: Chemical, Vol. 148, No. 2, 2010, pp. 353-357.
 S. S. Nath, D. Chakdar, G. Gope and D. K. Avasthi, “Ef- fect of 100 MeV Nickel Ions on Silica Coated ZnS Quantum Dots,” Journal of Nanoelectronics and Opto- electronics, Vol. 3, No. 2, 2008, pp. 180-183.
 S. S. Nath, D. Chakdar, G. Gope and D. K. Avasthi, “Novel Effect of Swift Heavy Ion on ZnO Quantum Dots Prepared by Quenching Method,” Nanotrends-A Journal of Nanotechnology and Its Application, Vol. 3, 2008, pp. 1-10.
 S. S. Nath, D. Chakdar, G. Gope, J. Kakati, B. Kalita, A. Talukdar and D. K. Avasthi, “Green Luminescence of ZnS and ZnS: Cu Quantum Dots Embedded in Zeolite Matrix,” Journal of Applied Physics, Vol. 105, No. 9, 2009, pp. 094305-094309. doi:10.1063/1.3110767
 S. S. Nath, M. Choudhury, G. Gope and R. K. Nath, “PVA Embedded ZnO Quantum Dots for Methanol Sens- ing,” Nanotrends-A Journal of Nanotechnology and Its Application, Vol. 8, 2010, pp. 1-4.
 D. Mohanta, S. S. Nath, A. Bordoloi, N. C. Mishra, S. K. Dolui and A. Choudhury, “Optical Absorption Study of 100-MeV Chlorine Ion Irradiated Hydroxyl Free ZnO Semiconductor Quantum Dots,” Journal of Applied Physics, Vol. 92, No. 12, 2002, pp. 7149-7152.
 R. K. Nath and S. S. Nath, “Tin Dioxide Thin Film-Based Ethanol Sensor Prepared by Spray Pyrolysis,” Sensors and Materials, Vol. 21, 2009, pp. 95-104.
 P. P. Sayhay, S. Tewari and R. K. Nath, “Optical and Electrical Studies on Spray Deposited ZnO Thin Films,” Crystal Research and Technology, Vol. l42, 2007, pp. 723-729.
 P. P. Sahay and R. K. Nath, “Al-Doped ZnO Thin Films as Methanol Sensors,” Sensors and Actuators B: Chemical, Vol. 134, No. 2, 2008, pp. 654-659.
 Y. K. Fang and J. sJ. Lee, “A Tin Oxide Thin Film Sen- sor with High Ethanol Sensitivity,” Thin Solid Films, Vol. 169, No. 1, 1989, pp. 51-56.
 S. Chakraborty, I. Mandal, I. Ray, S. Majumdar and A. Sen, “Improvement of Recovery Time of Nanostructured Tin Dioxide-Based Thick Film Gas Sensors through Sur- face Modification,” Sensors and Actuators B: Chemical, Vol. 127, No. 2, 2007, pp. 554-558.
 Liang Peng Indium, Teng-Feng Xie, Min Yang, Ping Wang, Dan Xu, Shan Pang and De-Jun Wang, “Light In- duced Enhancing Gas Sensitivity of Copper-Doped Zinc Oxide at Room Temperature,” Sensors and Actuators B: Chemical, 2008, pp. 659-660.
 V. S. Vaishnava, P. D. Patelb and N. G. Patelc, “Indium Tin Oxide Thin Film Gas Sensors for Detection of Etha- nol Vapours,” Proceedings of the 4th International Workshop on Semiconductor Sensors (SGS 2004), Vol. 490, No. 1, Thin Solid Film, Sciencedirect, 21 October 2005, pp. 94-100.
 T. P. Hulser, H. Wiggers, F. E. Kruis and A. Lorke, “Nanostructured Gas Sensors and Electrical Characteri- zation of Deposited SnO2 Nanoparticles in Ambient Gas Atmosphere,” Sensors and Actuators B: Chemical, Vol. 109, No. 1, 2005, pp. 13-18.
 Shih M. Chou, Lay G. Teoh, Wei H. Lai, Yen H. Su, Min H. Hon, “ZnO: Al Thin Film Gas Sensor for Detection of Ethanol Vapor,” Sensors, Vol. 6, No. 10, 2006, pp. 1420-1427. doi:10.3390/s6101420
 Shouli Bai, Liangyuan Chen, Pengcheng Yang, Ruixian Luo, Aifan Chen and Chung-Chiun Liu, “Sn/In/Ti Nano- Composite Sensor for CH4 Detection,” Sensors and Ac- tuators B: Chemical, Vol. 135, No. 1, 2008, pp. 1-6.
 B. Bhooloka Rao, “Zinc Oxide Ceramic Semi-Conductor Gas Sensor for Ethanol Vapour,” Science Direct, Materi- als Chemistry and Physics, Vol. 64, No. 1, 2000, pp. 62-65.
 P. P. Sahay, S. Tewari, S. Jha and M. Shamsuddin, “Sprayed ZnO Thin Films for Ethanol Sensors,” Journal of Materials Science, Vol. 40, No. 18, 2005, pp. 4791- 4793. doi:10.1007/s10853-005-0519-9
 K. K. Makhija, Arabinda Ray, R. M. Patel, U. B. Trivedi and H. N. Kapse, “Indium Oxide Thin Film Based Am- monia Gas and Ethanol Vapour Sensor,” Bulletin of Ma- terials Science, Vol. 28, No. 1, 2005, pp. 9-17.