Journal: Advanced Materials (Deerfield Beach, Fla.)

Article Title: Dual‐Scale Hydration‐Induced Electrical and Mechanical Torsional Energy Harvesting in Heterophilically Designed CNT Yarns

doi: 10.1002/adma.202501111

Figure Lengend Snippet: Molecular‐ and microscale characterizations of heterophilic CNT yarns a) Visualization of the surface property in CNT yarn during half‐immersion electrochemical oxidation (HECO) treatment. Optical photographs of a homophobic (left panel) and a heterophilic (right panel) CNT yarn, and a false color mapping representing the contact angle along the CNT yarn length during HECO (middle panel). Deconvoluted C1s X‐ray photoelectron spectroscopy (XPS) spectra of the b) HPB and c) HPL regions. d) Time dependence of the sprayed water amount and e) the spray rate of an ultrasonic humidifier calculated at 1‐second intervals (the number of samples = 4). f) Time dependence of yarn weight% of the HPB and HPL regions during a single hydration/dehydration cycle (inset: optical photographs of the HPL region at initial and fully hydrated states, scale bar = 100 µm). g) Schematic illustration depicting hydration‐induced volume expansion affecting the yarn radius ( r ), individual CNT bundle length ( L s ), and the number of twists ( n ) of one‐chiral McKibben structure. h) Scanning electron microscopy (SEM) images of the microscale structure of the HPB region at low (upper panel) (scale bar = 30 µm) and high magnifications (lower panel) (scale bar = 2 µm). i) 3D atomic force microscopy (AFM) mapping (upper panel) and height profile (lower panel) of the HPB region (size = 2.5 × 1.5 µm 2 ). Corresponding j) SEM images and k) AFM mapping and height profile of the HPL region.

Article Snippet: All electrochemical performance evaluations were conducted using an electrochemical analyzer (Vertex EIS, Ivium).

Techniques: Spectroscopy, Electron Microscopy, Microscopy