Talos s feg

The elemental distribution of fiber section was examined by scanning electron microscopy (SEM, Talos F200x, FEI) equipped with an energy‐dispersive X‐ray spectrometer (EDS). The microstructure of the TE fiber was analyzed by high‐resolution transmission electron microscopy (HR‐TEM, FEI Talos S‐FEG). Typical mechanical measurements under tension for the TE fibers were performed by ZW‐990LA (Dongguan Zhiqu Precision Instrument Co., Ltd). The electrical resistance of as‐prepared fiber was measured by a current–voltage (I–V) sweeping measurement technique (UNI‐T, UTP1306S). The Seebeck coefficients were investigated by recording the thermoelectric voltage (ΔV) induced by a temperature gradient built by thermal resistance. A resistor box (0–9000 Ω) was used to act as an external resistor when testing the output of the Ag₂Te_0.6S_0.4 fiber and TE devices. The detailed calculation of normalized theoretical maximum power density of device is shown in Supporting Note. The temperature profiles of TE device were captured by an infrared camera (IRay, T3S) with the accuracy of ±0.5 °C. The experiments involving human subjects were performed with the full, informed consent of the volunteers, and approval from a national or institutional ethics board/committee was not required.

MPDA nanoparticles were prepared as previously described.³² (link) Briefly, dopamine hydrochloride (0.30 g) and F127 (0.2 g) were dissolved in a mixed solution containing de-ionized water (10 ml) and ethanol (10 ml) while stirring. After 30 min, trimethyl benzene (320 μl) was added, and the mixture was sonicated for 10 min in a water bath. Subsequently, 750 μl of ammonia solution was added dropwise while stirring. Next, the reaction mixture was stirred at room temperature for 2 h, and finally, MPDA nanoparticles were obtained by centrifugation at 13 000 × g for 15 min, washed several times with water and ethanol, and suspended in water for further use. The morphological characteristics of the MPDA nanoparticles were determined using scanning electron microscopy (SEM, ZEISS GeminiSEM 300, Germany) and transmission electron microscopy (TEM, FEI Talos S-FEG, USA), and their surface parameters were measured from N₂ adsorption/desorption isotherms obtained using an ASAP 2460 Surface Area and Porosity Analyzer (Micromeritics Instrument Corp., Norcross, GA, USA).