We report a systematic study of the mechanical response of methylammonium lead triiodide CH3NH3PbI3 nanowires by employing bending measurements using atomic force microscope on suspended wires over photo-lithographically patterned channels. Force-deflection curves measured at room temperature give a Young's modulus between 2 and 14 GPa. This broad range of values is attributed to the variations in the microcrystalline texture of halide perovskite nanowires. The mechanical response of a highly crystalline nanowire is linear with force and has a brittle character. The braking modulus of 48 ± 20 MPa corresponds to 100 μm of radius of curvature of the nanowires, rendering them much better structures for flexible devices than spin coated films. The measured moduli decrease rapidly if the NW is exposed to water vapor.

中文翻译：

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CH3NH3PbI3纳米线的机械响应

我们报告了对甲基铵三碘化铅 CH3NH3PbI3 纳米线的机械响应的系统研究，该研究使用原子力显微镜在光刻图案通道上的悬垂线上进行弯曲测量。在室温下测量的力-挠度曲线给出的杨氏模量在 2 到 14 GPa 之间。这种广泛的值归因于卤化物钙钛矿纳米线的微晶结构的变化。高度结晶的纳米线的机械响应与力呈线性关系并且具有脆性。48 ± 20 MPa 的制动模量对应于 100 μm 的纳米线曲率半径，这使得它们比旋涂膜具有更好的柔性设备结构。如果 NW 暴露在水蒸气中，测得的模量会迅速下降。