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

1. Article Introduction & AbstractThis 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.