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Sensors and Materials, Volume 21, Number 2 (2009)
Copyright(C) MYU K.K.
pp. 117-125
S&M753 Research Paper
Published: June 1, 2009

Experimental Investigations on Humidity-Sensing Behaviour of Neodymium Oxide [PDF]

Bal Chandra Yadav, Richa Srivastava, Monika Singh and Alok Kumar

(Received August 3, 2008; Accepted December 2, 2008)

Keywords: humidity sensor, sensitivity, annealing, resistance

In this paper, we report the humidity-sensing behaviour of neodymium oxide (99% pure, Johnson & Matthey, London). It was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and by measuring the mass loss. From SEM, the average particle size is 60–90 nm and particles have a random pore size. XRD reveals that at room temperature the sensing material is Nd(OH)3 and is crystalline in nature. When neodymium oxide was annealed at 200°C and at higher temperatures, it became Nd2O3. The particle size calculated from Scherrer’s formula varies from 100 to 110 nm. A pellet of this material was made using a hydraulic pressing machine (M.B. Instruments, New Delhi) for use as a sensing element after thermal annealing at temperatures of 200, 400, 600 and 800°C. After each step of annealing, the sensing element was placed in a specially designed conductivity holder and exposed to humidity inside a chamber with controlled humidity. Variations in resistance due to the adsorption of water vapour through the sensing element were observed. The sensitivity of the sensing element, the repeatability and the effect of temperature on morphology and sensing characteristics were studied.

Corresponding author: Bal Chandra Yadav

Cite this article
Bal Chandra Yadav, Richa Srivastava, Monika Singh and Alok Kumar, Experimental Investigations on Humidity-Sensing Behaviour of Neodymium Oxide, Sens. Mater., Vol. 21, No. 2, 2009, p. 117-125.

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