Multicomponent Gas Sensing Fiber Probe System Based on Platinum Coated Capillary Enhanced Raman Spectroscopy

Area of Science:

• Optical Fiber Sensing
• Raman Spectroscopy
• Materials Science

Background:

• Gas sensing technologies are crucial for environmental monitoring and industrial safety.
• Existing methods often face limitations in sensitivity, selectivity, and response time.
• Optical fiber probes offer potential for remote and in-situ gas detection.

Purpose of the Study:

• To develop a novel multicomponent gas-sensing optical fiber probe system.
• To investigate the application of Atomic Layer Deposition (ALD) in fabricating a gas Raman sensing probe.
• To evaluate the performance of the proposed probe for detecting gases like carbon dioxide (CO2).

Main Methods:

• Fabrication of a Platinum-coated capillary using Atomic Layer Deposition (ALD) technology.
• Integration of the capillary as the core of an optical fiber probe for enhanced Raman spectroscopy.
• Experimental testing for multicomponent gas sensing, including CO2 detection, with varying exposure times.

Main Results:

• The novel probe achieved a low detection limit of 55 ppm for CO2 with a 30-second exposure time.
• Demonstrated good repeatability in multicomponent gas sensing.
• The Platinum-coated capillary exhibited excellent stability, environmental resistance, and a large core diameter facilitating rapid gas exchange.

Conclusions:

• The proposed ALD-fabricated noble metal capillary gas Raman probe is a promising advancement in gas sensing technology.
• The system's stability, sensitivity, and rapid response rate make it suitable for practical, real-world applications.
• This work highlights the potential of ALD in creating advanced optical fiber probes for sensitive gas detection.