Morphological study and thermal analysis of surface modified $alpha;-FeOOH via in situ polymerization of methyl methacrylate

2004 ◽  
Vol 39 (7-8) ◽  
pp. 1159-1166
Author(s):  
H YAOXING
Keyword(s):  
Thermal Analysis ◽  
Methyl Methacrylate ◽  
Morphological Study ◽  
In Situ Polymerization ◽  
Surface Modified

scholarly journals Humidity Sensing Properties of Surface Modified Polyaniline Metal Oxide Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
S. C. Nagaraju ◽  
Aashis S. Roy ◽  
J. B. Prasanna Kumar ◽  
Koppalkar R. Anilkumar ◽  
G. Ramagopal
Keyword(s):  
In Situ Polymerization ◽  
High Sensitivity ◽  
Thermal Coefficient ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Praseodymium Oxide ◽  
Surface Modified ◽  
Oxide Composites ◽  
Polymerization Method

Polyaniline- (PANI) praseodymium Oxide (Pr2O3) composites have been synthesized by in situ polymerization method with different weight percentages. The synthesized composites have been characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The temperature dependent conductivity shows that the conductivity is due to the hopping of polarons and bipolarons. These composites show negative thermal coefficient (α) behavior as a function of temperature, which is characteristic behavior of semiconducting materials. Sensor studies have been carried out by two-probe method and found that the sensitivity increases with increase in % RH. It is noticed that stability increase is due to the presence of Pr2O3in polyaniline up to 30 wt%. A fast recovery and response time along with high sensitivity make these composites suitable for humidity sensors.

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