Excellence in Research and Innovation for Humanity

C I L Justino

Publications

2

Publications

2
5306
Determination of Volatile Organic Compounds in Human Breath by Optical Fiber Sensing
Abstract:
This work proposes an optical fiber system (OF) for sensing various volatile organic compounds (VOCs) in human breath for the diagnosis of some metabolic disorders as a non-invasive methodology. The analyzed VOCs are alkanes (i.e., ethane, pentane, heptane, octane, and decane), and aromatic compounds (i.e., benzene, toluene, and styrene). The OF displays high analytical performance since it provides near real-time responses, rapid analysis, and low instrumentation costs, as well as it exhibits useful linear range and detection limits; the developed OF sensor is also comparable to a reference methodology (gas chromatography-mass spectrometry) for the eight tested VOCs.
Keywords:
Breath analysis, gas chromatography-mass spectrometry, optical fiber sensor, volatile organic compounds
1
8428
Optical Fiber Sensor for Detection of Carbon Nanotubes
Abstract:
This work relates the development of an optical fiber (OF) sensor for the detection and quantification of single walled carbon nanotubes in aqueous solutions. The developed OF displays a compact design, it requires less expensive materials and equipment as well as low volume of sample (0.2 mL). This methodology was also validated by the comparison of its analytical performance with that of a standard methodology based on ultraviolet-visible spectroscopy. The developed OF sensor follows the general SDS calibration proposed for OF sensors as a more suitable calibration fitting compared with classical calibrations.
Keywords:
Optical fiber sensor, single-walled carbon nanotubes, SDS calibration model, UV-Vis spectroscopy