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Nanosensors to Detect Protease Activity In Vivo for Noninvasive Diagnostics
Published on: July 16, 2018
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Selectively arranged single-wire based nanosensor array systems for gas monitoring
O Chmela1, J Sadílek, G Domènech-Gil
1Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61200 Brno, Czech Republic. vargas@feec.vutbr.cz stella.vallejosvargas@ceitec.vutbr.cz.
Nanoscale
|May 3, 2018
Summary
This study developed novel gas nanosensors using tungsten oxide nanowires. Non-functionalized sensors showed higher sensitivity to nitrogen dioxide (NO2), while platinum-functionalized sensors detected ethanol (C2H5OH) better.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Gas sensors are crucial for environmental monitoring and industrial safety.
- Tungsten oxide nanowires offer promising properties for gas sensing applications.
- Functionalization can tune sensor selectivity and sensitivity.
Purpose of the Study:
- To develop and characterize gas nanosensors based on non-functionalized and platinum-functionalized tungsten oxide nanowires.
- To evaluate the sensing performance towards nitrogen dioxide (NO2) and ethanol (C2H5OH).
- To understand the impact of platinum functionalization on sensor selectivity and sensitivity.
Main Methods:
- Fabrication of nanoelectrode arrays using electron beam lithography.
- Deposition of tungsten oxide nanowires via aerosol assisted chemical vapor deposition.
- Integration of nanowires using dielectrophoresis.
- Testing sensor response to varying concentrations of NO2 and C2H5OH.
Main Results:
- Non-functionalized sensors exhibited higher sensitivity and partial selectivity towards NO2.
- Platinum-functionalized sensors showed enhanced sensing properties for C2H5OH.
- Platinum functionalization led to a reduced response to NO2.
Conclusions:
- The observed differences in sensing behavior are attributed to chemical and electronic interactions at the Pt/tungsten oxide interface.
- Platinum functionalization alters the surface chemistry, favoring ethanol detection over nitrogen dioxide.
- These findings provide insights for designing selective gas nanosensors.
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