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Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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Eco-friendly screen-printed sensor using tapioca-based conductive ink modified with coconut fibers.

Rafaela C de Freitas1, Jéssica Rocha Camargo1, Laís Canniatti Brazaca2

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Researchers developed eco-friendly, water-based conductive inks using cassava starch for sustainable electrochemical sensors. These novel sensors show promise for detecting uric acid and hydrogen peroxide in various samples.

Keywords:
Coconut fiberHydrogen peroxideTapiocaUric acidWater-based conductive ink

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Green Chemistry

Background:

  • Development of sustainable and cost-effective materials for electrochemical sensors is crucial.
  • Traditional conductive inks often rely on hazardous organic solvents.
  • There is a growing need for environmentally friendly alternatives in sensor fabrication.

Purpose of the Study:

  • To create a novel, eco-friendly water-based conductive ink using cassava starch and sorbitol.
  • To fabricate screen-printed electrodes for electrochemical sensing applications.
  • To evaluate the sensor performance for detecting uric acid and hydrogen peroxide.

Main Methods:

  • Fabrication of water-based conductive ink using cassava starch, sorbitol, graphite, and carbon black.
  • Screen-printing of electrodes.
  • Electrochemical detection of uric acid using differential pulse voltammetry.
  • Electrochemical detection of hydrogen peroxide using cyclic voltammetry.
  • Incorporation of coconut fiber into the ink formulation for sensor development.

Main Results:

  • The developed ink enabled the fabrication of screen-printed electrodes for electrochemical sensing.
  • Uric acid detection showed a linear range of 5.0–100 μmol L⁻¹ and a detection limit of 0.34 μmol L⁻¹.
  • Sensors achieved recovery rates of 86.9%–112.1% for synthetic urine and human serum.
  • Hydrogen peroxide detection demonstrated a linear range of 2.3–11.4 mmol L⁻¹ and a detection limit of 0.6 μmol L⁻¹.
  • Sensors showed satisfactory performance in pharmaceutical applications with recovery rates of 90.3%–106.9%.

Conclusions:

  • Cassava starch serves as an effective eco-friendly binder for water-based conductive inks.
  • The developed conductive ink and sensors are suitable for analytical applications, including biological and pharmaceutical analysis.
  • This research promotes the use of sustainable materials in the development of environmentally friendly electrochemical sensors.