期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 45, 页码 14066-14070出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201707491
关键词
Carbon monoxide; carbon nanotubes; iron porphyrin; sensors; voltage-activated
资金
- KAUST [CRF-2015-SENSORS-2719]
- Army Research Office through Institute for Soldier Nanotechnologies
- National Science Foundation [DMR-1410718]
- Ruth L. Kirschstein National Research Service Award
- NIH [T32ES007020]
Carbon monoxide (CO) outcompetes oxygen when binding to the iron center of hemeproteins, leading to a reduction in blood oxygen level and acute poisoning. Harvesting the strong specific interaction between CO and the iron porphyrin provides a highly selective and customizable sensor. We report the development of chemiresistive sensors with voltage-activated sensitivity for the detection of CO comprising iron porphyrin and functionalized single-walled carbon nanotubes (F-SWCNTs). Modulation of the gate voltage offers a predicted extra dimension for sensing. Specifically, the sensors show a significant increase in sensitivity toward CO when negative gate voltage is applied. The dosimetric sensors are selective to ppm levels of CO and functional in air. UV/Vis spectroscopy, differential pulse voltammetry, and density functional theory reveal that the in situ reduction of Fe-III to Fe-II enhances the interaction between the F-SWCNTs and CO. Our results illustrate a new mode of sensors wherein redox active recognition units are voltage-activated to give enhanced and highly specific responses.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据