A Stretchable Glucose Sensor via Conductive Polymer-Coated VACNT Forests Rooted in Elastomer Polymer Substrate

This article presents a stretchable glucose sensor composed of dodecylbenzenesulfonate-doped polypyrrole (PPyDBS)-coated vertically aligned carbon nanotube (VACNT) forests rooted in polydimethylsiloxane (PDMS) substrate. The measured sensitivity was approximately 10 mAcm ⁻² M ⁻¹ with a wide linear range demonstrated, as low as 0.1 mM and up to 12 mM, and the sensor achieved 90% of steady-state current in less than 3 s. The PDMS/CNT/PPy(DBS)/GOx structure was tested under stretching, demonstrating the coefficients of determination larger than 0.982, indicating its robustness of sensing capability of glucose concentrations with tensile strain up to 75%. These results show the potential of this stretchable glucose sensor with a novel fabrication strategy and stretchable electrode design toward potential wearable applications interfacing with physiological fluids.