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

被引:106
作者
Feng, Dongliang [1 ,2 ]
Du, Lingling [1 ,2 ]
Xing, Xiaxia [1 ,2 ]
Wang, Chen [1 ,2 ]
Chen, Jian [1 ,2 ]
Zhu, Zhengyou [1 ,2 ]
Tian, Yongtao [3 ,4 ]
Yang, Dachi [1 ,2 ]
机构
[1] Nankai Univ, Coll Elect Informat & Opt Engn, Tianjin Key Lab Optoelect Sensor & Sensing Networ, Tianjin 300350, Peoples R China
[2] Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect, Tianjin 300350, Peoples R China
[3] Zhengzhou Univ, Sch Phys & Engn, Zhengzhou 450001, Peoples R China
[4] Zhengzhou Univ, Key Lab Mat Phys, Minist Educ, Zhengzhou 450001, Peoples R China
基金
中国国家自然科学基金;
关键词
high selectivity; NiO/WO3 composite nanoparticles; gas sensor; H2S biomarker; halitosis; WO3; NANOFIBERS; GAS SENSORS; NIO; DIAGNOSIS; SULFIDE; NETWORKS; ETHANOL; GROWTH;
D O I
10.1021/acssensors.0c01280
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:733 / 741
页数:9
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