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Evaluating Different TiO2 Nanoflower-Based Composites for Humidity Detection
Musa Mohamed Zahidi1,2, Mohamad Hafiz Mamat1,3, Mohd Firdaus Malek3,4
1NANO-ElecTronic Centre (NET), School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia.
Sensors (Basel, Switzerland)
|August 12, 2022
Summary
Titanium dioxide nanoflowers (TFNA) show promise for humidity sensors. Composites with reduced graphene oxide (rGO) significantly boosted sensor response due to enhanced conductivity and surface area.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Three-dimensional (3D) titanium dioxide (TiO2) nanoflowers (TFNA) possess unique properties like large surface area and hydrophilicity, making them suitable for humidity sensing.
- Compositing TFNA with other materials can potentially enhance their humidity sensing performance.
Purpose of the Study:
- To investigate the impact of different composite materials on the performance of TFNA-based humidity sensors.
- To explore NiO, ZnO, reduced graphene oxide (rGO), and PVDF as composite candidates with TiO2 nanoflowers.
Main Methods:
- TiO2 nanoflowers were synthesized using a modified solution immersion method.
- Composite materials were characterized using FESEM, XRD, TEM, XPS, I-V analysis, Hall effect, and contact angle measurements.
- Humidity sensor performance was evaluated using a dedicated system within a controlled humidity chamber.
Main Results:
- The TiO2-rGO composite exhibited the highest sensor response, reaching 39,590%.
- Enhanced electrical conductivity, hydrophilicity, and specific surface area of the TiO2-rGO composite contributed to its superior performance.
- Other composites (NiO, ZnO, PVDF) were also explored, but showed lower sensor responses compared to TiO2-rGO.
Conclusions:
- Compositing TiO2 nanoflowers with reduced graphene oxide significantly enhances humidity sensing capabilities.
- The TiO2-rGO composite demonstrates potential for developing high-performance humidity sensors.
