Optical fluorescent sensor based on perovskite QDs for nitric oxide gas detection.

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Nitric oxide (NO) is a critical signaling molecule and pollutant.
• Accurate and rapid detection of NO gas is essential for environmental and biomedical applications.
• Existing NO sensors face challenges in harsh environments.

Purpose of the Study:

• To develop a novel optical fluorescent sensor for nitric oxide (NO) gas detection.
• To utilize cesium lead bromide perovskite quantum dots (PQDs) as the sensing material.
• To evaluate the sensor's performance in terms of sensitivity and response time.

Main Methods:

• Coating cesium lead bromide perovskite quantum dots (PQDs) on filter paper to create an optical sensor.
• Excitation of the PQDs using a UV LED at a central wavelength of 380 nm.
• Testing the sensor's response to varying NO concentrations (0-1000 ppm) and measuring fluorescence intensity ratios.

Main Results:

• The optical NO sensor achieved a sensitivity of 6, defined as the ratio of fluorescence intensities in pure nitrogen versus 1000 ppm NO.
• The sensor exhibited a response time of 26 seconds from pure nitrogen to 1000 ppm NO.
• A recovery time of 117 seconds was observed when switching from 1000 ppm NO back to pure nitrogen.

Conclusions:

• The developed PQD-based optical fluorescent sensor is effective for NO gas detection.
• The sensor shows promise for monitoring NO concentrations in challenging environmental conditions.
• This work presents a new pathway for NO sensing applications.