Flexible capacitive pressure sensor based on multi-walled carbon nanotube electrodes

Micro & nano letters

article

Na Shao¹  Jian Wu¹  Xing Yang²  Jialin Yao²  Yunsheng Shi²  Zhaoying Zhou² 

[1] School of Information Engineering, Nanchang Hangkong University;Department of Precision Instruments, Tsinghua University;State Key Laboratory of Precision Measurement Technology and Instrumentation, Tsinghua University;School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University;Department of Electronics and Optics Engineering, Mechanical Engineering College

关键词: capacitive sensors;    capacitance measurement;    pressure sensors;    pressure measurement;    multi-wall carbon nanotubes;    nanosensors;    electrodes;    microsensors;    dielectric materials;    C;    pressure 0 Pa to 758 Pa;    wearable electronic product;    health monitoring device;    electronic skin;    poly(chloro-p-xylylene);    parylene C;    dielectric layer;    micronano structure;    electronic property;    mechanical property;    MWNT;    sandwich-like structure;    multiwalled carbon nanotube electrode;    flexible capacitive pressure sensor;   

DOI  :  10.1049/mnl.2016.0529

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Aim:To evaluate the use of perfusion index for diagnosis of abnormal collateral hand circulation (CHC), in comparison with the modified Allen test and pulse oximetry using Doppler ultrasonography as a reference test. Methodology: Forty two (84 hands) healthy volunteers were randomly selected for our study. Adequacy of the collateral hand circulation during occlusion of the radial artery was assessed in each hand using four tests by four expert investigators, one for each test: (I) Modified Allen test (2) Perfusion index (3) Pulse oximetry, and (4) Doppler ultrasonography being the standard test. Results: The Doppler ultrasonography (the standard test) diagnosed abnormal CHC in 3 hands (3.5%). The modified Allen test showed abnormal CHC in 16 hands (19%), with sensitivity100%, specificity 78% and positive predictive value 18.7% when compared with the standard Doppler ultrasonography. Also pulse oximetry method indicated abnormal CHC in 4 hands (4.7%) with sensitivity100% specificity 98% and 75% positive predictive value. ROC analysis showed that > 65.7% reduction in the perfusion index diagnosed abnormal CHC with 100% sensitivity, 98.8% specificity and 75.5% positive predictive value using Doppler ultrasonography as a reference test. Conclusion: Using Doppler ultrasonography as a reference test, perfusion index is a reliable objective test for diagnosis and prediction of abnormal CHC, with high sensitivity, specificity, and accepted positive predictive value.

【 授权许可】

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