Although continuous monitoring of constituents in complex
sweat
is crucial for noninvasive physiological evaluation, biofouling on
the sweat sensor surface and inadequate flexible self-healing materials
restrict its applications. Herein, a fully self-healing and strong
anti-biofouling polypeptide complex hydrogel (AuNPs/MoS2/Pep hydrogel) with excellent electrochemical performances was created.
The anti-fouling electrochemical sweat sensor was fabricated based
on the AuNPs/MoS2/Pep hydrogel to address these issues.
It was found that the polypeptide hydrogel was designed to form a
network structure and carried abundant hydrophilic groups, resulting
in a AuNPs/MoS2/Pep hydrogel with superior anti-biofouling
properties in sweat for 30 min and even long-term stability in undiluted
human sweat. In addition, SEM, TEM, UV, XPS, and infrared spectrogram
demonstrated that the binding force of π–π stacking
force between MoS2 and naphthalene groups in the designed
peptide endowed the polypeptide complex hydrogel with an excellent
self-healing property. Furthermore, the polypeptide complex hydrogel
preserved wearable device function of continuously monitoring uric
acid (UA) and ascorbic acid (AA) in sweat in situ. This novel fabricated
sweat sensor with high anti-biofouling ability, excellent self-healing
property, and sensitive and selective analytical capability describes
a new opportunity for health monitoring in situ.