Nanoengineered Ink for Designing 3D Printable Flexible Bioelectronics

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Flexible electronics demand biointerfaces with tissue-like mechanical properties and conductivity.
• Conventional methods often use toxic cross-linkers and suffer from poor biocompatibility and mechanical trade-offs.

Purpose of the Study:

• To engineer shear-thinning hydrogels for 3D printing flexible bioelectronics.
• To overcome limitations of existing biointerfaces regarding mechanical properties, conductivity, and biocompatibility.

Main Methods:

• Developed shear-thinning hydrogels via vacancy-driven gelation of molybdenum disulfide (MoS2) nanoassemblies with thiolated gelatin.
• Utilized 3D printing to create complex, deformable structures from the engineered hydrogel inks.

Main Results:

• Achieved a 20-fold increase in compressive moduli and 80% strain tolerance, matching human anatomical flexibility.
• Demonstrated high conductivity, compressive modulus, pseudocapacitance, and excellent biocompatibility.
• 3D-printed structures showed high strain sensitivity for wearable motion detection.

Conclusions:

• The developed nanoengineered hydrogels provide superior mechanical, electronic, and biological properties.
• These materials are promising for applications in 3D-printed flexible biosensors, actuators, and therapeutic devices.