We designed a shielding–sensing integrated multilayer
composite
based on PET (poly(ethylene terephthalate)) and carbon nanotubes using
UV laser scribing and electroless plating. APTES ((3-aminopropyl)triethoxysilane)-modified
carbon nanotubes and the mixture of carbon nanotubes and silica gel
were used as the active and shielding layer in the composite, respectively.
The electrochemical performance and electromagnetic shielding effectiveness
(SE) were investigated to assess the sensing and shielding properties
of the composite. Under optimized conditions, the sensor achieved
a sensitivity of 6699.0 μA mM–1 cm–2 with a linear range (LR) of 1.0–5 mM at high concentrations
toward glucose oxidation. In contrast, a sensitivity of 7140.0 μA
mM–1 cm–2 in the linear range
of 10–60 μM was displayed for low concentrations. Simultaneously,
the composite exhibited a SE value up to 43.64 dB between 30 and 6000
MHz. To explore the protective effect of the designed composite, the
electric field distribution was calculated through finite difference
time domain (FDTD) simulations. Additionally, tensile tests were conducted
to validate the excellent serviceability and stretchability of the
composite. The as-prepared multilayer composite with integrated shielding–sensing
function holds great potential in the wearable physiology monitoring
and electromagnetic interference shielding applications for 5G electronic
products.