1：Experimental Design and Method Selection:

Crystalline C60–C70 alloy NWs were synthesized by a liquid–liquid interfacial precipitation method. The bending tests were performed inside a high-resolution transmission electron microscope, and the deformation behavior was observed in situ. The bending force acting on the NWs was measured simultaneously by an optical deflection method.

2：Sample Selection and Data Sources:

The nominal composition of C70 molecules in the solutions was selected to be 0, 5, 10, 15, 26, and 40 mass%. The precipitated NWs were desiccated and manipulated for testing.

3：List of Experimental Equipment and Materials:

High-resolution transmission electron microscope, atomic force microscopy microcantilever, focused-ion-beam method (FIB-SEM, Hitachi NB5000), and a specimen holder for transmission electron microscopy.

4：Experimental Procedures and Operational Workflow:

The NWs were fixed on an edge of a gold plate using a focused-ion-beam method. The plate was mounted onto a specimen holder for TEM. An atomic force microscopy microcantilever with a nanometer-sized silicon tip was then mounted on a cantilever holder for TEM. The specimen holder was manipulated to position the NWs at the center of the observation area of the microscope.

5：Data Analysis Methods:

The Young’s modulus of the NWs was derived from the relationship between the force and flexure for the deflection of free-end cantilever beams.