1：Experimental Design and Method Selection:

The study involved the synthesis of ZnO nanostructures via chemical bath deposition (CBD) method and their deposition onto tapered optical fibers. The sensor's response to H2 gas was tested at different concentrations and operating temperatures.

2：Sample Selection and Data Sources:

Tapered optical fibers were used as the transducing platform. The ZnO nanostructures were characterized using FESEM, XRD, and EDX to confirm material properties.

3：List of Experimental Equipment and Materials:

Equipment included a Vytran GPX-3400 optical glass fiber processor for tapering, FESEM (Hitachi SU8030), EDX (Horiba EX-250X-MAX80), and XRD (PANalytical EMPYREAN). Materials included zinc sulfate (ZnSO4), ammonium hydroxide (NH4OH), and ethanolamine (C2H7NO).

4：Experimental Procedures and Operational Workflow:

The optical fiber was tapered to a specific dimension, followed by the synthesis and deposition of ZnO nanostructures. The sensor's performance was tested by exposing it to different H2 concentrations in synthetic air at 180oC.

5：Data Analysis Methods:

The sensor's response was analyzed based on absorbance changes measured using a spectrophotometer (USB4000 VIS-NIR, Ocean Optics USA).