4.6 Article

Highly Sensitive and Selective NiO/WO3 Composite Nanoparticles in Detecting H2S Biomarker of Halitosis

期刊

ACS SENSORS
卷 6, 期 3, 页码 733-741

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acssensors.0c01280

关键词

high selectivity; NiO/WO3 composite nanoparticles; gas sensor; H2S biomarker; halitosis

资金

  1. National Natural Science Foundation of China [52072184]
  2. Fundamental Research Funds for the Central Universities, Nankai University [63201179]

向作者/读者索取更多资源

A highly sensitive and selective NiO/WO3 nanoparticles sensor has been developed for the detection of hydrogen sulfide (H2S), showing superior performance compared to conventional sensors and potential for future medical applications.
Indirectly monitoring halitosis via the detection of hydrogen sulfide (H2S) biomarkers using gas sensors is a newly emerging technique. However, such H2S sensors are required with critically high selectivity and sensitivity, as well as a ppb-level detection limit, which remains technologically challenging. To address such issues, here, we have developed highly sensitive and selective H2S sensors with NiO/WO3 nanoparticles (NPs), which have been synthesized by firstly hydrolyzing WO3 NPs and subsequently decorating with NiO NPs in a hydrothermal process. Theoretically, the NiO/WO3 NPs assist in forming a thicker electron depletion layer, adsorbing more oxygen species O-2(-) to oxidize H2S and finally release more electrons. Beneficially, 2.1 wt % NiO/WO3 NPs show high sensitivity to H2S (R-a/R-g = 15031 +/- 1370 @ 10 ppm, 100 degrees C), which is 42.6-fold higher than that of the pristine WO3 NPs (R-a/R-g = 353 +/- 5.6 @ 10 ppm, 100 degrees C). Further, the H2S sensor shows ppb-level detection limit (R-a/R-g = 4.95 +/- 2.9 @ 0.05 ppm, 100 degrees C) and high selectivity. Practically, NiO/WO3 NP sensor prototype has been employed to detect the simulated exhaled halitosis compared with that of gas chromatography, revealing a close concentration of H2S. Our investigation offers an experimental base in future intelligent medical applications.

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