The data of the article“Fabrication of Ag₂Se Thermoelectric Fibers via Selenization”

This dataset is derived from research on the fabrication of flexible inorganic thermoelectric fibers. Addressing the high manufacturing costs and stringent temperature requirements of conventional fabrication strategies, this study reports a facile approach to fabricating Ag₂Se thermoelectric fibers via dopamine surface modification combined with in-situ chemical deposition.The specific process involves forming a polydopamine (PDA) adhesive layer on the surface of polyimide (PI) fibers through self-polymerization.

Subsequently, a dense silver layer is deposited onto the adhesive layer via a silver mirror reaction, followed by a selenization process to convert the silver into an Ag₂Se thermoelectric layer.2. Dataset Introduction (Description of Figures and Data)The dataset contains data corresponding to 8 primary figures, detailing the preparation process, microstructural characterization, chemical analysis, and thermoelectric performance testing of the Ag₂Se fibers:Figure 1: Fabrication Process and Intermediate CharacterizationData Description:(a) Schematic illustration of the fabrication process (PDA modification -> Silver mirror reaction -> Selenization).(b) FTIR spectra of PDA powder, pure PI fibers, and PDA-PI fibers, confirming successful dopamine coating.(c-f) SEM images comparing the surface morphology of pure PI, PDA-PI, untreated silver-coated fibers (PI/Ag), and PDA-modified silver-coated fibers (PDA-PI/Ag), demonstrating the improved density of the silver layer due to PDA.Figure 2: Microstructure and Composition of PI-PDA/Ag₂Se FibersData Description:(a-b) SEM images comparing the surface morphology of selenized fibers with PDA treatment (PDA-PI/Ag₂Se) and without treatment (PI/Ag₂Se).(c) XRD patterns of the fibers before and after selenization, verifying the phase transformation from Ag to Ag₂Se.(d-f) XPS spectra (including Ag 3d and Se 3d fine spectra) confirming the chemical valency and elemental binding of the Ag₂Se phase.Figure 3: Impact of PDA Pre-treatment on Thermoelectric PerformanceData Description:Comparative bar charts displaying the Seebeck coefficient, electrical conductivity, and Power Factor (PF) for pre-treated (PDA-Ag₂Se) versus untreated (Ag₂Se) fibers.

The data highlights the significant performance enhancement attributed to the PDA layer.Figure 4: Morphology of Intermediate Ag Layers at Different Precursor ConcentrationsData Description:SEM images of the silver-coated fibers (before selenization) prepared using different AgNO₃ concentrations (0.5, 1.0, 1.5, and 2.0 g/100 mL). This data illustrates how precursor concentration affects nucleation density, particle size, and layer coverage.Figure 5: Crystal Structure at Different Precursor ConcentrationsData Description:XRD patterns of the final Ag₂Se fibers prepared with varying AgNO₃ concentrations.

The data shows that all samples match the Ag₂Se standard (PDF#24-1041) and that crystallinity improves with increased concentration.Figure 6: Morphology of Final Ag₂Se Fibers at Different Precursor ConcentrationsData Description:SEM images of the final selenized fibers prepared with different AgNO₃ concentrations (0.5, 1.0, 1.5, and 2.0 g/100 mL). Used to analyze the effect of precursor concentration on the density and grain growth of the final thermoelectric layer.Figure 7: Thermoelectric Performance Regulation via Precursor ConcentrationData Description:Plots showing the trends of the Seebeck coefficient, electrical conductivity, and power factor as a function of AgNO₃ concentration, identifying 1.5 g/100 mL as the optimal parameter.Figure 8: Device Integration and Stability TestingData Description:(a) Schematic of the flexible thermoelectric device assembly.(b) Open-circuit voltage output characteristics of the device under different temperature differences (ΔT).(c) Mechanical stability data: Relative resistance change of the fiber over 500 bending cycles (bending radius = 7.5 mm).(d) Washing stability data: Variation in the Seebeck coefficient after multiple washing cycles, assessing durability.