Fig. 4: Fabrication and evaluation of an I2 gas sensor prototype. | Nature Communications

Fig. 4: Fabrication and evaluation of an I2 gas sensor prototype.

From: Highly sensitive, responsive, and selective iodine gas sensor fabricated using AgI-functionalized graphene

Fig. 4: Fabrication and evaluation of an I2 gas sensor prototype.The alt text for this image may have been generated using AI.

a Operating principle and printed circuit board layout of the prototype. ADC Analog-to-Digital Converter, DAC Digital-to-Analog Converter, MCU Microcontroller Unit, LCD Liquid Crystal Display. b Features of the prototype, including pre-calibration for temperature and humidity effects, an adaptable user interface for comprehensive, real-time measurements, and wireless data transmission to PC terminals. c Comparison of response and recovery times between the prototype and two commercial I2 gas sensors for the detection of 50 ppm I2 gas. d Sensors’ readouts at varying I2 concentrations (40 ppb–50 ppm), demonstrating the prototype’s capability to detect I2 levels below 100 ppb, which commercial sensors could not achieve. e Photograph of the testing site and the measured I2 concentrations displayed by the three sensors. The actual I2 concentration in the chamber is 60 ppb, accurately detected only by our sensor. The error bars in b represent the standard deviations from five measurement cycles. Source data are provided as a Source Data file.

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