A self-designed versatile and portable sensing device based on smart phone for colorimetric detection.

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Sensor Technology

Background:

• Traditional UV-vis spectrometers are crucial analytical instruments but are expensive and require skilled operators.
• This limits their use in field or daily measurements outside of laboratory settings.

Purpose of the Study:

• To develop a sensitive, cost-effective, facile, and portable sensing device utilizing smartphone technology.
• To provide an accessible alternative for UV-vis spectroscopic analysis.

Main Methods:

• A 3D-printed sensing device was designed to hold sample solutions and generate light signals.
• A smartphone's optical sensor acted as a transducer, measuring transmitted light intensity.
• An inner filter ensured only designated wavelengths reached the sample, with signals processed by the smartphone.

Main Results:

• The device's feasibility was confirmed by detecting four common heavy metal ions in real water samples.
• Results demonstrated good agreement with traditional UV-vis spectrometer measurements.
• The developed sensor showed high sensitivity and accuracy.

Conclusions:

• Smartphone-based sensors offer a viable solution for portable, low-cost, and accurate chemical analysis.
• This technology has the potential to broaden the application of spectroscopic methods for out-of-lab measurements.
• The device demonstrates significant potential for environmental monitoring and point-of-care diagnostics.