Scholarlink

<p>Graphene-related materials exhibit exceptional intrinsic mechanical properties, yet their practical deployment is critically limited by defects that trigger premature failure. Here, we present the first direct coupling of high-resolution Atomic Force Microscopy (AFM) topographic imaging with micro-tensile testing to observe in real-time crack initiation and propagation in monolayer and few-layer graphene produced via mechanical exfoliation on compliant substrates. Artificially introduced nanoscale defects serve as controlled proxies for inevitable imperfections in real-world devices, revealing crack initiation at remarkably low strains − 0.45% in monolayers and 0.62% in few-layer graphene. Quantitative analysis shows that few-layer graphene exhibits a higher fracture toughness (11.0 ± 2.3 MPa·m<sup>1/2</sup>) than monolayers (7.97 ± 2.10 MPa·m<sup>1/2</sup>), along with intrinsic mechanisms that impede crack advance. These results establish the first direct in situ quantification of fracture mechanics in supported graphene, bridging atomic-scale defect behaviour with macroscopic reliability. By revealing how nanoscale defects govern failure pathways, this work provides essential design principles for defect-tolerant graphene-based nanodevices and structural materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessing the fracture toughness of graphene by in situ AFM mechanical testing

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月29日

查看全文
  • Elli Bellou,
  • Maria Giovanna Pastore Carbone,
  • Anastasios C. Manikas,
  • Costas Galiotis

摘要

Graphene-related materials exhibit exceptional intrinsic mechanical properties, yet their practical deployment is critically limited by defects that trigger premature failure. Here, we present the first direct coupling of high-resolution Atomic Force Microscopy (AFM) topographic imaging with micro-tensile testing to observe in real-time crack initiation and propagation in monolayer and few-layer graphene produced via mechanical exfoliation on compliant substrates. Artificially introduced nanoscale defects serve as controlled proxies for inevitable imperfections in real-world devices, revealing crack initiation at remarkably low strains − 0.45% in monolayers and 0.62% in few-layer graphene. Quantitative analysis shows that few-layer graphene exhibits a higher fracture toughness (11.0 ± 2.3 MPa·m1/2) than monolayers (7.97 ± 2.10 MPa·m1/2), along with intrinsic mechanisms that impede crack advance. These results establish the first direct in situ quantification of fracture mechanics in supported graphene, bridging atomic-scale defect behaviour with macroscopic reliability. By revealing how nanoscale defects govern failure pathways, this work provides essential design principles for defect-tolerant graphene-based nanodevices and structural materials.