文献类型：期刊文献

英文题名：Stress-sensing response and mechanism of organic mechanochromic luminescent film on metallic structures

作者：Zhang, Zhe[1,2,3];Shao, Zhengxu[1];Zhang, Di[4];Zhao, Weijun[5];Qiu, Zijie[4];Chen, Xu[1,2,3];Tang, Ben Zhong[4]

机构：[1]Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300350, Peoples R China;[2]Tianjin Key Lab Chem Proc Safety & Equipment Techn, Tianjin 300350, Peoples R China;[3]Tianjin Univ, Zhejiang Inst, Ningbo 315201, Zhejiang, Peoples R China;[4]Chinese Univ Hong Kong Shenzhen, Guangdong Basic Res Ctr Excellence Aggregate Sci, Sch Sci & Engn, Shenzhen 518172, Guangdong, Peoples R China;[5]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn, Shanghai, Peoples R China

年份：2025

卷号：288

外文期刊名：JOURNAL OF LUMINESCENCE

收录：;EI(收录号：20254119307390);WOS:【SCI-EXPANDED(收录号:WOS:001597853600002)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2022YFC3004501) , the National Natural Science Foundation of China (52075368) , and the Guangdong Basic Research Center of Excellence for Aggregate Science.

语种：英文

外文关键词：Mechanochromic luminescence; Metal grain sizes; Stress-sensing measurement

摘要：Owing to good film-forming capability on the surface of metals, organic mechanochromic luminescent (MCL) molecules have great potential to develop a low-cost and full-field stress-sensing measurement method for largescale metallic structures. However, their deformation-induced fluorescence response varies across different metals, posing great challenges for industrial applications. The present work investigates the stress-sensing response and mechanism of an MCL molecule, 1,1,2,2-tetrakis(4-nitrophenyl)ethene (TPE-4N), coated on 316L stainless steel substrates with grain sizes from 3.2 mu m to 80.1 mu m. The effect of the grain structure of 316L steel substrates on the mechanoresponsive fluorescence of TPE-4N film is investigated under tensile deformation. Notably, mechanoresponsive fluorescence is highly related to both tensile strain and the microstructure of substrates. The ultrafine-grained substrate exhibits fluorescence intensity much higher than that of the coarsegrained substrate under the same tensile strain. The tensile deformation of the substrates induces the grain boundary to rotate and slide, as well as in-grain slips, which destroy the crystalline TPE-4N film, resulting in green fluorescence emission. The relationship among fluorescence intensity, tensile strain, and deformationinduced surface roughness differs in substrates with varying grain structures. Our investigations provide quantitative insights to promote the development of the MCL-based stress-sensing measurement method in metallic structures.