7:35 PM - EQ06.14.14
Late News: Flexible Glucose Biosensing via Carbon Nanotube-Based Electrodes on Elastomer Polymer Substrate
Anthony Palumbo1,Chenguang Zhao1,Shichen Fu1,Siwei Chen1,Zheqi Li1,Haoyu Wang1,Kalle Levon2,Eui-Hyeok Yang1
Stevens Institute of Technology1,New York University2
Electrochemical wearable biosensors are suitable for diverse skin-attachable applications owing to their high performance, inherent miniaturization, and low cost , . Incorporating flexible and stretchy materials enables electrochemical biosensors to impact a wide range of developing applications, including electronic skins , smart sensor bandages , and implantable medical devices . Flexible/stretchable sensors need to be capable of accommodating various mechanical disturbances such as large bending, twisting and stretching, while retaining their performance for numerous cycles . Though extensive efforts have been made, the performance of such flexible/stretchable electrodes under dynamic deformations issue need further studies , not only in scientific studies but also in any practical device applications.
Here, we study a flexible glucose sensor which can be subjected to various lateral strains via stretching, while providing reliable electrochemical sensing of biomarkers on a patient’s skin, undeterred by daily activity and repetitive impacts. Vertically aligned carbon nanotubes (CNTs) grown via chemical vapor deposition (CVD) are embedded onto suspended polydimethylsiloxane (PDMS). The CNTs are coated with a conjugated polymer transducer layer via electropolymerization of polypyrrole (PPy), doped with glucose oxidase (GOx). The sensor is exposed to iterative concentrations of glucose, and GOx reacts in the presence of glucose, resulting in a concentration-dependent change of measurable current. For this sensor, we have developed CNT-based sensing electrodes on flexible substrates that exhibit reliable and stable performance under stretching up to 75%. Skin-attachable devices for continuous monitoring of patients will directly benefit the medical field, with potential applications towards smart sensor bandages, critical wound monitoring, and glucose detection for diabetes.
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