Raman scattering applied to human breath analysis

Arachchige, Charuka Muktha; Muller, Andreas

doi:10.1016/j.trac.2024.117791

TrAC Trends in Analytical Chemistry

2024

DOI: 10.1016/j.trac.2024.117791

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Raman scattering applied to human breath analysis

Charuka Muktha Arachchige,

Andreas Muller

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2024

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Cited by 2 publications

References 79 publications

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Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Xie,

et al. 2024

ACS Appl. Nano Mater.

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The decoration of less agglomerated hierarchical semiconducting metal oxides with noble metals is a widely used strategy to obtain high-performance gas sensors. Beyond conventional approaches, we synthesized amorphous Pt-decorated NiFe 2 O 4 nanorods as sensing materials by using a temperature-controlled onestep impregnation method. This method is characterized by its simplicity and green, energy-efficient, and economical use of noble metals. The Pt-decorated NiFe 2 O 4 nanorods show unusual resistance behavior in air, and their operating temperature−resistance curve exhibits two transitions. This phenomenon results from the enhanced chemisorption of oxygen molecules compared to pristine NiFe 2 O 4 , which was proven by the operating temperature-dependent resistance behavior in N 2 . The synergistic effects between the amorphous noble metal and less agglomerated structure lead to significantly improved sensing performance to acetone, especially the 5 wt % Pt-decorated NiFe 2 O 4 . It shows a 37-fold increase in gas response, a lower optimal operating temperature, and enhanced selectivity compared to its counterpart. This research offers an efficient method for designing noble metal-decorated, highperformance metal oxide sensing materials and provides insights into the baseline resistance of oxygen chemisorption onto the surface sensing materials.

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Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Xie,

et al. 2024

ACS Appl. Nano Mater.

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Nitrogen-Doped Carbon Quantum Dots Activated Dandelion-Like Hierarchical WO₃ for Highly Sensitive and Selective MEMS Sensors in Diabetes Detection

Ni,

Dong,

et al. 2024

ACS Sens.

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High sensitivity, low concentration, and excellent selectivity are pronounced primary challenges for semiconductor gas sensors to monitor acetone from exhaled breath. In this study, nitrogen-doped carbon quantum dots (N-CQDs) with high reactivity were used to activate dandelion-like hierarchical tungsten oxide (WO 3 ) microspheres to construct an efficient and stable acetone gas sensor. Benefiting from the synergistic effect of both the abundant active sites provided by the unique dandelion-like hierarchical structure and the high reaction potential generated by the sensitization of the N-CQDs, the resulting 16 wt % N-CQDs/ WO 3 sensor shows an ultrahigh response value (R a /R g = 74@1 ppm acetone), low detection limit (0.05 ppm), outstanding selectivity, and reliable stability to acetone at the optimum working temperature of 210 °C. Noteworthy that the N-CQDs facilitate the carrier migration and intensify the reaction between acetone and WO 3 during the sensing process. Considering the above advantages, N-CQDs as a sensitizer to achieve excellent gassensitive properties of WO 3 are a promising new strategy for achieving accurate acetone detection in real time and facilitating the development of portable human-exhaled gas sensors.

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Raman scattering applied to human breath analysis

Cited by 2 publications

References 79 publications

Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Nitrogen-Doped Carbon Quantum Dots Activated Dandelion-Like Hierarchical WO₃ for Highly Sensitive and Selective MEMS Sensors in Diabetes Detection

Contact Info

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About

Raman scattering applied to human breath analysis

Cited by 2 publications

References 79 publications

Amorphous Pt-Decorated NiFe2O4 Nanorods for Acetone Sensing

Amorphous Pt-Decorated NiFe2O4 Nanorods for Acetone Sensing

Nitrogen-Doped Carbon Quantum Dots Activated Dandelion-Like Hierarchical WO3 for Highly Sensitive and Selective MEMS Sensors in Diabetes Detection

Contact Info

Product

Resources

About

Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Amorphous Pt-Decorated NiFe₂O₄ Nanorods for Acetone Sensing

Nitrogen-Doped Carbon Quantum Dots Activated Dandelion-Like Hierarchical WO₃ for Highly Sensitive and Selective MEMS Sensors in Diabetes Detection