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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

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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.

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|August 12, 2022
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
TiO2 nanoflowercompositehumidity sensorsolution immersion method

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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.