Improved response time of flexible microelectromechanical sensors employing eco-friendly nanomaterials

Nanoscale
Shicheng FanXihua Wang

Abstract

Flexible force/pressure sensors are of interest for academia and industry and have applications in wearable technologies. Most of such sensors on the market or reported in journal publications are based on the operation mechanism of probing capacitance or resistance changes of the materials under pressure. Recently, we reported the microelectromechanical (MEM) sensors based on a different mechanism: mechanical switches. Multiples of such MEM sensors can be integrated to achieve the same function of regular force/pressure sensors while having the advantages of ease of fabrication and long-term stability in operation. Herein, we report the dramatically improved response time (more than one order of magnitude) of these MEM sensors by employing eco-friendly nanomaterials-cellulose nanocrystals. For instance, the incorporation of polydimethysiloxane filled with cellulose nanocrystals shortened the response time of MEM sensors from sub-seconds to several milliseconds, leading to the detection of both diastolic and systolic pressures in the radial arterial blood pressure measurement. Comprehensive mechanical and electrical characterization of the materials and the devices reveal that greatly enhanced storage modulus and loss modulus p...Continue Reading

References

Sep 8, 2010·Advanced Materials·Brian P TimkoDaniel S Kohane
Sep 14, 2010·Nature Materials·Stefan C B MannsfeldZhenan Bao
Mar 29, 2011·Nature Nanotechnology·Takeo YamadaKenji Hata
Oct 25, 2011·Nature Nanotechnology·Darren J LipomiZhenan Bao
Mar 14, 2012·Nano Letters·Daniel J CohenMichel M Maharbiz
Oct 10, 2015·Advanced Materials·Qize ZhongJun Zhou
Nov 26, 2015·Nanotechnology, Science and Applications·Johnsy George, S N Sabapathi

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