Room Temperature NH 3 Gas Sensing Characteristics of Spray Deposited Transition Metal Ions Substituted CoFe 2O 4 Thin Films

2021 ◽  
Author(s):  
M. Vadivel ◽  
Ramesh Babu Ramraj ◽  
M. Sridharan
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Metal Ions ◽  
Room Temperature ◽  
Gas Sensing ◽  
Transition Metal Ions ◽  
Sensing Characteristics

Electron-Nuclear Hyperfine Interactions of 53Cr 3+ in Mg2SiO4 (Forsterite)

1980 ◽  
Vol 35 (12) ◽  
pp. 1296-1303 ◽  
Author(s):  
H. Rager
Keyword(s):  
Transition Metal ◽  
Hyperfine Interaction ◽  
Metal Ions ◽  
Room Temperature ◽  
Hyperfine Interactions ◽  
Small Variation ◽  
Transition Metal Ions ◽  
Oxygen Sublattice ◽  
Oxygen Coordination ◽  
Nuclear Spin System

Abstract The magnetic hyperfine interaction between the electron and nuclear spin system of 53Cr3+ was studied at the Mg sites, M1 and M2, in Mg2SiO4. The study was undertaken at room temperature and 9.52 GHz. The hyperfine structure data exhibit a covalent Cr-O bonding of approximately 10% indicating a mainly but not purely ionic bonding. Including the corresponding results obtained for 57Fe 3+ [1] and 55Mn2+ [2] in Mg2SiO4, this is interpreted such that the bonding of transition metal ions is mainly dominated by the oxygen sublattice in Mg2SiO4 and less by the properties of the transition metal ions themselves. The small variation of the hyperfine splitting parameters found for 53Cr3+ at M1 and M2, and also for 57Fe3+ at these positions indicates that the hyperfine interaction varies also with varying average metal oxygen distances as well as with changes in the oxygen coordination size.

Energy transfer—room temperature phosphorescence for the optosensing of transition metal ions

2003 ◽  
Vol 486 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Juan Dı́az-Garcı́a ◽  
José M Costa-Fernández ◽  
Nerea Bordel ◽  
Rosario Pereiro ◽  
Alfredo Sanz-Medel
Keyword(s):  
Energy Transfer ◽  
Transition Metal ◽  
Metal Ions ◽  
Room Temperature ◽  
Transition Metal Ions ◽  
Room Temperature Phosphorescence

Spin coated unsubstituted copper phthalocyanine thin films for nitrogen dioxide sensors

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540032 ◽  
Author(s):  
Sanjay Chakane ◽  
Ashok Datir ◽  
Pankaj Koinkar
Keyword(s):  
Thin Films ◽  
Nitrogen Dioxide ◽  
Room Temperature ◽  
Copper Phthalocyanine ◽  
Gas Sensing ◽  
Mixed Solution ◽  
Visible Absorption ◽  
Α Phase ◽  
Uv Visible ◽  
Sensing Characteristics

Copper phthalocyanine ( CuPc ) is synthesized chemically and used for making CuPc thin films using spin coating technique. Films were prepared from trifluroacetic acid (TFA) and chlorobenzene mixed solution on the glass substrate. Spin coated films of unsubstituted CuPc films were heat annealed at 150°C for 2 h duration and were used to study NO 2 gas sensing characteristics. α-phase of CuPc is noted by UV-visible absorption spectra. IR spectra of undoped CuPc films and doped CuPc films with NO 2 revealed that, doping of nitrogen dioxide modifies and deletes some of the bands. The effect of NO 2 at various concentrations from 50 ppm to 500 ppm in atmospheric air at room temperature on the electrical conductivity of CuPc films was studied. Sensitivity, response time and repeatability of the CuPc sensor were discussed in this paper.

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