1：Experimental Design and Method Selection:

The study involves synthesizing CdSe/CdxZn1-xS quantum dots, modifying them with mercaptopropionic acid for water solubility, incorporating them into a PVA matrix, and fabricating nanofiber films via electrospinning. Humidity sensing is based on photoluminescence changes with relative humidity.

2：Sample Selection and Data Sources:

Samples include PVA/QDs-COOH nanofiber films with different QD concentrations (0.07 wt%, 0.14 wt%, 0.28 wt%). Humidity environments are created using a programmable temperature and humidity chamber.

3：07 wt%, 14 wt%, 28 wt%). Humidity environments are created using a programmable temperature and humidity chamber. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Materials include cadmium oxide, selenium, sulfur, trioctylphosphine, oleic acid, 1-octadecene, mercaptopropionic acid, zinc acetate, sodium hydroxide, sodium carbonate decahydrate, lithium chloride, trichloromethane, acetone, polyvinyl alcohol. Equipment includes transmission electron microscope (TEM, Joel JEM-2001 F), FTIR spectrometer (Thermo Nicolet Nexus), Raman microscope (Renishaw), scanning electron microscope (SEM, JSM-5610LV, HITACHI), universal testing machine (Instron1341, Instron Ltd.), fluorometer (RF-5301 PC), thermogravimetric analysis instrument (STA449F3), electrospinning setup with syringe and aluminum plate.

4：Experimental Procedures and Operational Workflow:

Synthesis of QDs involves dissolving Se and S in TOP, reacting with CdO and Zn(Ac)2 in oleic acid and ODE under N2, injection of precursors, and cooling. QDs are purified and modified with MPA. PVA is dissolved in water, mixed with QDs-COOH, and electrospun at 15 kV, 0.5 mL/h flow rate, 45°C, humidity below 40%. Humidity sensing involves placing films in a chamber at various RH values, measuring PL spectra after stabilization, and in-situ monitoring for response and recovery times.

5：5 mL/h flow rate, 45°C, humidity below 40%. Humidity sensing involves placing films in a chamber at various RH values, measuring PL spectra after stabilization, and in-situ monitoring for response and recovery times. Data Analysis Methods:

5. Data Analysis Methods: PL intensity is measured and correlated with RH. FTIR and Raman spectra are analyzed for peak shifts to study hydrogen bonding and proton transfer. Statistical analysis includes linear regression for R2 values.