NDLI: Investigation of Annealing Temperature on Structural and Morphological Properties of Cr$_{2}$O$_{3}$ Nanoparticles for Humidity Sensor Application

Content Provider	Springer Nature Link
Author	Jayamurugan, P. Mariappan, R. Premnazeer, K. Ashokan, S. Subba Rao, Y. V. Seshagiri Rao, N. V. S. S. Shanmugapriya, C.
Copyright Year	2017
Abstract	Cr$_{2}$O$_{3}$ nanoparticles have been prepared for precipitation technique at reaction temperature 50 °C. The prepared samples were annealed different temperatures at 500,700 and 1000 °C. Synthesized powders were characterized as X-ray diffraction, optical, transmission electron microscope, SEM with EDAX, humidity sensor, FTIR. The annealing temperature has been found to be playing a crucial role in the controlling particle size. XRD study shows the rhombohedral crystal structure of highly preferential orientation along (1 0 4) direction. FTIR reveals that the presence Cr–O bonds in the structure. The TEM images show that the size of NPs of Cr$_{2}$O$_{3}$ varied from 26 to 60 nm with average crystalline size 43 nm. UV–visible spectrum shows the absorption band of Cr$_{2}$O$_{3}$ nanoparticles at 400 nm. The humidity sensor of the Cr$_{2}$O$_{3}$ nanoparticles was studied by two temperature method. 1000 °C annealed Cr$_{2}$O$_{3}$ nanoparticles show better sensing properties and exhibits good linearity in response than 500 °C. SEM images show the clusters and agglomeration of nanoparticles. EDAX spectrum confirms the presence of Cr$_{2}$O$_{3}$ nanoparticles. Each samples have been characterized as sensing materials to determine relative humidity in the range of 20–90%. The humidity sensing property increased with increasing of annealing temperature and the resistance was decreased.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	15572064
Journal	Sensing and Imaging: An International Journal
Volume Number	18
Issue Number	1
e-ISSN	15572072
Language	English
Publisher	Springer US
Publisher Date	2017-06-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chromium oxide nano particles Effect of annealing temperature TEM Humidity sensor X-ray diffraction SEM with EDAX Electrical Engineering Microwaves, RF and Optical Engineering Imaging Radiology
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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