High reliable gas sensor based on crystal-facet regulatedα-Fe2O3 nanocrystals for rapid detection of exhaled acetone  

作　　者：Jin-Yong Hu Hong Lei Hong-Yu Zhang Xiong-Xiong Xue Xin-Peng Wang Cong-Hui Wang Yong Zhang 

机构地区：[1]School of Physics and Optoelectronics,Xiangtan University,Xiangtan,411105,China [2]School of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou,450001,China [3]Hunan Institute of Advanced Sensing and Information Technology,Xiangtan University,Xiangtan,411105,China

出　　处：《Rare Metals》2024年第12期6500-6515,共16页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.62101477,62071410 and 21802114);the Science and Technology Innovation Program of Hunan Province(No.2023RC3133);the Excellent Youth Scholars of Hunan Provincial Department of Education(No.21B0141)。

摘　　要：The exploitation of the highly reliable gassensing device for exhaled acetone detection possesses momentous and capacious development prospects in the field of an early noninvasive diabetes diagnosis.Considering that the characteristics of crystal facets will impact the gas-sensitive performance,herein three different resistive gas sensors were successfully developed by utilizing the stable α-Fe_(2)O_(3)with different crystal facets as the sensitive materials.The gas-sensitive performance testing results reveal that the(110)crystal faceted α-Fe_(2)O_(3)sensor exhibits relatively superior comprehensive gas sensitivity toward acetone.Particularly,it is worth mentioning that the sensor demonstrates reliable sensitivity,rapid response(25 s)/recovery(3 s)speed,and strong anti-interference capability in detecting 2×10^(-6)acetone for the concentration threshold of diabetes,even when exposed to prolonged periods in variable environments.Furthermore,by simply validating the feasibility of the exhalation diagnosis using the as-prepared gas sensor,the(110)faceted α-Fe_(2)O_(3)gas sensor can effectively discriminate the states of healthy human exhalation and the simulated diabetic exhalation.Through integrating the experimental and theoretical analyses,the superior acetone-sensitive performance of the(110)facetedα-Fe_(2)O_(3)gas sensor can principally be interpreted in correlation with crystal facet-dependent gas adsorption capacity and defect-forming ability.These results not only imply a tremendous application perspective in monitoring acetone gas at sub-ppm concentration,but also open up an effective throughway to develop reliable gas-sensing devices for early non-invasive diabetes screening.

关 键 词：Crystal facet Acetone sensor α-Fe_(2)O_(3)nanocrystals High reliability Exhaled breath analysis 

分 类 号：O61[理学—无机化学]