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Low Power Resistive Oxygen Sensor Based on Sonochemical SrTi0.6Fe0.4O2.8 (STFO40).

Stratulat A, Serban BC, de Luca A, Avramescu V, Cobianu C, Brezeanu M, Buiu O, Diamandescu L, Feder M, Ali SZ, Udrea F - Sensors (Basel) (2015)

Bottom Line: Oxygen detection tests are performed in both dry (RH = 0%) and humid (RH = 60%) nitrogen atmosphere, varying oxygen concentrations between 1% and 16% (v/v), at a constant heater temperature of 650 °C.The oxygen sensor, based on the Sono-STFO40 sensing layer, shows good sensitivity, low power consumption (80 mW), and short response time (25 s).These performance are comparable to those exhibited by state-of-the-art O2 sensors based on STFO60, thus proving Sono-STFO40 to be a material suitable for oxygen detection in harsh environments.

View Article: PubMed Central - PubMed

Affiliation: Honeywell Romania SRL, Sensors and Wireless Laboratory Bucharest (SWLB), Bucharest 020339, Romania. alisa.stratulat@honeywell.com.

ABSTRACT
The current paper reports on a sonochemical synthesis method for manufacturing nanostructured (typical grain size of 50 nm) SrTi0.6Fe0.4O2.8 (Sono-STFO40) powder. This powder is characterized using X ray-diffraction (XRD), Mössbauer spectroscopy and Scanning Electron Microscopy (SEM), and results are compared with commercially available SrTi0.4Fe0.6O2.8 (STFO60) powder. In order to manufacture resistive oxygen sensors, both Sono-STFO40 and STFO60 are deposited, by dip-pen nanolithography (DPN) method, on an SOI (Silicon-on-Insulator) micro-hotplate, employing a tungsten heater embedded within a dielectric membrane. Oxygen detection tests are performed in both dry (RH = 0%) and humid (RH = 60%) nitrogen atmosphere, varying oxygen concentrations between 1% and 16% (v/v), at a constant heater temperature of 650 °C. The oxygen sensor, based on the Sono-STFO40 sensing layer, shows good sensitivity, low power consumption (80 mW), and short response time (25 s). These performance are comparable to those exhibited by state-of-the-art O2 sensors based on STFO60, thus proving Sono-STFO40 to be a material suitable for oxygen detection in harsh environments.

No MeSH data available.


Normalized resistance vs. oxygen concentration for both Sono-STFO40 and STFO60.
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sensors-15-17495-f007: Normalized resistance vs. oxygen concentration for both Sono-STFO40 and STFO60.

Mentions: Figure 7 shows the layer resistance variation with the O2 concentration for both STFO60 and Sono-STFO40. The reference resistance (R0) is the resistance measured at an oxygen concentration of 16% in dry nitrogen atmosphere. Exhibiting m = 0.082, the Sono-STFO40 layer proves to be less “crystalline” than STFO60 (m = 0.15) and thus more “disordered”. Both materials show good sensitivity towards oxygen, with a slight advantage for STFO60. These results might be due to the higher temperature employed to synthesize STFO60, leading to a more coherent material microstructure.


Low Power Resistive Oxygen Sensor Based on Sonochemical SrTi0.6Fe0.4O2.8 (STFO40).

Stratulat A, Serban BC, de Luca A, Avramescu V, Cobianu C, Brezeanu M, Buiu O, Diamandescu L, Feder M, Ali SZ, Udrea F - Sensors (Basel) (2015)

Normalized resistance vs. oxygen concentration for both Sono-STFO40 and STFO60.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541946&req=5

sensors-15-17495-f007: Normalized resistance vs. oxygen concentration for both Sono-STFO40 and STFO60.
Mentions: Figure 7 shows the layer resistance variation with the O2 concentration for both STFO60 and Sono-STFO40. The reference resistance (R0) is the resistance measured at an oxygen concentration of 16% in dry nitrogen atmosphere. Exhibiting m = 0.082, the Sono-STFO40 layer proves to be less “crystalline” than STFO60 (m = 0.15) and thus more “disordered”. Both materials show good sensitivity towards oxygen, with a slight advantage for STFO60. These results might be due to the higher temperature employed to synthesize STFO60, leading to a more coherent material microstructure.

Bottom Line: Oxygen detection tests are performed in both dry (RH = 0%) and humid (RH = 60%) nitrogen atmosphere, varying oxygen concentrations between 1% and 16% (v/v), at a constant heater temperature of 650 °C.The oxygen sensor, based on the Sono-STFO40 sensing layer, shows good sensitivity, low power consumption (80 mW), and short response time (25 s).These performance are comparable to those exhibited by state-of-the-art O2 sensors based on STFO60, thus proving Sono-STFO40 to be a material suitable for oxygen detection in harsh environments.

View Article: PubMed Central - PubMed

Affiliation: Honeywell Romania SRL, Sensors and Wireless Laboratory Bucharest (SWLB), Bucharest 020339, Romania. alisa.stratulat@honeywell.com.

ABSTRACT
The current paper reports on a sonochemical synthesis method for manufacturing nanostructured (typical grain size of 50 nm) SrTi0.6Fe0.4O2.8 (Sono-STFO40) powder. This powder is characterized using X ray-diffraction (XRD), Mössbauer spectroscopy and Scanning Electron Microscopy (SEM), and results are compared with commercially available SrTi0.4Fe0.6O2.8 (STFO60) powder. In order to manufacture resistive oxygen sensors, both Sono-STFO40 and STFO60 are deposited, by dip-pen nanolithography (DPN) method, on an SOI (Silicon-on-Insulator) micro-hotplate, employing a tungsten heater embedded within a dielectric membrane. Oxygen detection tests are performed in both dry (RH = 0%) and humid (RH = 60%) nitrogen atmosphere, varying oxygen concentrations between 1% and 16% (v/v), at a constant heater temperature of 650 °C. The oxygen sensor, based on the Sono-STFO40 sensing layer, shows good sensitivity, low power consumption (80 mW), and short response time (25 s). These performance are comparable to those exhibited by state-of-the-art O2 sensors based on STFO60, thus proving Sono-STFO40 to be a material suitable for oxygen detection in harsh environments.

No MeSH data available.