MTL Annual Research Report 2012 » george whitfield http://www-mtl.mit.edu/wpmu/ar2012 Call for Titles Thu, 01 Nov 2012 17:15:28 +0000 en-US hourly 1 http://wordpress.org/?v=3.5.1 The Role of Hierarchical Morphologies in the High- performance Gas Sensing of CuO-Based Chemiresistors http://www-mtl.mit.edu/wpmu/ar2012/the-role-of-hierarchical-morphologies-in-the-high-performance-gas-sensing-of-cuo-based-chemiresistors/ http://www-mtl.mit.edu/wpmu/ar2012/the-role-of-hierarchical-morphologies-in-the-high-performance-gas-sensing-of-cuo-based-chemiresistors/#comments Wed, 18 Jul 2012 22:26:23 +0000 MTL WP admin http://www-mtl.mit.edu/wpmu/ar2012/?p=5993

Gas sensors are essential in the monitoring, control, and reduction of harmful emissions in the environment [1] .  Conductometric gas sensors based on semiconducting metal oxides are advantageous in many applications due to high sensitivity, manufacturability, and small size.  However, there are a number of drawbacks, including difficulty in control over the semiconductor/substrate interface, high power consumption, and reduced selectivity at high temperatures (300-400˚C) required for operation [2] [3] . The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest due to their great technological potential [4] . This work presents new insight towards the development of high-performance p-type semiconductor gas sensors.  Gas sensor test devices, based on copper (II) oxide (CuO) with innovative and unique urchin-like structures, were prepared by a microwave-assisted synthesis method. An assembly of urchin-like structures was found to be most effective for hydrogen detection in the range of parts-per-billion (300 ppb) at low temperatures (200˚C). These results show that morphology plays an important role in the gas sensing performance of p-type semiconducting CuO gas sensors.

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  3. K. Wiesner, H. Knozinger, M. Fleischer, and H. Meixner, “Working mechanism of an ethanol filter for selective high-temperature methane gas sensors,” IEEE Sensors Journal, vol. 2, no. 4, pp. 354-359, Aug., 2002.
  4. D.-J. Yang, I. Kamienchick, D. Y. Youn, A. Rothschild, and I.-D. Kim, “Ultrasensitive and highly selective gas sensors based on electrospun SnO(2) nanofibers modified by Pd loading,” Advanced Functional Materials, vol. 20, no. 24, pp. 4258-4264, Dec., 2010.
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