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A Room Temperature H₂ Sensor Fabricated Using High Performance Pt-Loaded SnO₂ Nanoparticles.

Wang SC, Shaikh MO - Sensors (Basel) (2015)

Bottom Line: Using Pt as catalyst improved sensor response and reduced the operating temperature for achieving high sensitivity because of the negative temperature coefficient observed in Pt-loaded SnO2.The highest sensor response to 1000 ppm H2 was 10,500 at room temperature with a response time of 20 s.The morphology of the SnO2 nanoparticles, the surface loading concentration and dispersion of the Pt catalyst and the microstructure of the sensing layer all play a key role in the development of an effective gas sensing device.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan. scwang@mail.stust.edu.tw.

ABSTRACT
Highly sensitive H2 gas sensors were prepared using pure and Pt-loaded SnO2 nanoparticles. Thick film sensors (~35 μm) were fabricated that showed a highly porous interconnected structure made of high density small grained nanoparticles. Using Pt as catalyst improved sensor response and reduced the operating temperature for achieving high sensitivity because of the negative temperature coefficient observed in Pt-loaded SnO2. The highest sensor response to 1000 ppm H2 was 10,500 at room temperature with a response time of 20 s. The morphology of the SnO2 nanoparticles, the surface loading concentration and dispersion of the Pt catalyst and the microstructure of the sensing layer all play a key role in the development of an effective gas sensing device.

No MeSH data available.


Related in: MedlinePlus

(a) XRD result of sensing film loaded with different concentrations of Pt; (b) Schematic illustration of thick film sensor utilizing interdigitated Pt electrodes. SEM image showing (c) top view and (d) cross sectional morphology of sensing film.
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sensors-15-14286-f003: (a) XRD result of sensing film loaded with different concentrations of Pt; (b) Schematic illustration of thick film sensor utilizing interdigitated Pt electrodes. SEM image showing (c) top view and (d) cross sectional morphology of sensing film.

Mentions: As mentioned in the experimental section, we loaded the SnO2 nanoparticles with three different concentrations of Pt (Sensor B, C and D). The Pt-loaded SnO2 thick film sensor was fabricated using the same screen printing and annealing steps utilized for the pure SnO2 thick film sensor (Sensor A). Sensors were characterized using XRD while the top and cross sectional morphology was observed under an SEM as shown in Figure 3. The XRD results show peaks corresponding to the (111) and (200) planes of Pt and the intensity of the peaks increases as the Pt-loading concentration increases. The SEM images show a highly porous interconnected structure with an average sensor film thickness of about 35 μm.


A Room Temperature H₂ Sensor Fabricated Using High Performance Pt-Loaded SnO₂ Nanoparticles.

Wang SC, Shaikh MO - Sensors (Basel) (2015)

(a) XRD result of sensing film loaded with different concentrations of Pt; (b) Schematic illustration of thick film sensor utilizing interdigitated Pt electrodes. SEM image showing (c) top view and (d) cross sectional morphology of sensing film.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507593&req=5

sensors-15-14286-f003: (a) XRD result of sensing film loaded with different concentrations of Pt; (b) Schematic illustration of thick film sensor utilizing interdigitated Pt electrodes. SEM image showing (c) top view and (d) cross sectional morphology of sensing film.
Mentions: As mentioned in the experimental section, we loaded the SnO2 nanoparticles with three different concentrations of Pt (Sensor B, C and D). The Pt-loaded SnO2 thick film sensor was fabricated using the same screen printing and annealing steps utilized for the pure SnO2 thick film sensor (Sensor A). Sensors were characterized using XRD while the top and cross sectional morphology was observed under an SEM as shown in Figure 3. The XRD results show peaks corresponding to the (111) and (200) planes of Pt and the intensity of the peaks increases as the Pt-loading concentration increases. The SEM images show a highly porous interconnected structure with an average sensor film thickness of about 35 μm.

Bottom Line: Using Pt as catalyst improved sensor response and reduced the operating temperature for achieving high sensitivity because of the negative temperature coefficient observed in Pt-loaded SnO2.The highest sensor response to 1000 ppm H2 was 10,500 at room temperature with a response time of 20 s.The morphology of the SnO2 nanoparticles, the surface loading concentration and dispersion of the Pt catalyst and the microstructure of the sensing layer all play a key role in the development of an effective gas sensing device.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan. scwang@mail.stust.edu.tw.

ABSTRACT
Highly sensitive H2 gas sensors were prepared using pure and Pt-loaded SnO2 nanoparticles. Thick film sensors (~35 μm) were fabricated that showed a highly porous interconnected structure made of high density small grained nanoparticles. Using Pt as catalyst improved sensor response and reduced the operating temperature for achieving high sensitivity because of the negative temperature coefficient observed in Pt-loaded SnO2. The highest sensor response to 1000 ppm H2 was 10,500 at room temperature with a response time of 20 s. The morphology of the SnO2 nanoparticles, the surface loading concentration and dispersion of the Pt catalyst and the microstructure of the sensing layer all play a key role in the development of an effective gas sensing device.

No MeSH data available.


Related in: MedlinePlus