Vol. 109, Issue 10, October 2009, pp. 9-16

Hydrogen Sensor Based on Carbon Nano-tube Fortified by Palladium

^*A. Kazemzadeh, A. F. Hessari, M. Kashani, H. Azizi and N. Jafari

Materials & Energy Research center

P.O. Box 14155 – 4777 Tehran, Iran

Tel.: +98261-6204131-4, fax: +98261-6201888

E-mail: Asg642001@yahoo.com

Received: 20 October 2009   /Accepted:  24 November 2009   /Published:  30 November 2009

Abstract: In this paper single-wall carbon Nano-tubes (SWNT) were prepared by using chemical – Thermal vapor deposition method and utilizing molybdenum and iron catalysts and silica alumina – base. Methane was passed over catalyst in optimum condition including passing speed equal to 4 lit/min and pressure of 1.27 bar for 2-25 minutes and temperature of furnace was equal to 980 °C and prepared carbon Nano-tubes were sublimated in 1600 °C to achieve 70 % yields. Diameter and specific area of Nano-tubes were 2-15 nm and 400-560 m²/g respectively. Various quantities of palladium chloride were inserted in carbon used for prepared Nano-tubes by utilizing vacuum evaporation which its optimum quantity was 0/10 g in order to enhance sensitivity of carbon Nano-tubes relative to hydrogen to make sensors appropriate for low temperatures. For investigation instruments and determining physical properties, XRD, AFM, SEM and TEM equipments have been applied and prepared. Hydrogen sensor is simple, low cost and ready to use in various environment.

Keywords: Hydrogen sensor, Carbon Nanotube and Palladium

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