A股異動丨石墨烯概念股普漲 單層多晶石墨烯可控斷裂技術獲突破
格隆匯12月10日丨石墨烯概念股普漲,其中華控賽格(000068.SZ)、德爾未來(002631.SZ)和斯迪克(300806.SZ)漲停。近日,中國科學院深圳先進技術研究院光子信息與能源材料研究中心副研究員陳明與新加坡南洋理工大學電子電氣工程系教授魏磊合作,研發出一種針對單層多晶石墨烯的可控斷裂技術。在外加應力條件下,例如通過傳統的拉伸方式(以PDMS等柔性材料作為基底)拉伸納米薄膜材料,在被拉伸的納米薄膜材料上形成的裂紋往往具有同時出現、隨機且不可控的特徵,以此得到的圖案也總是無序的。這是因為基底材料的應變是全局分佈的。這種全局分佈的應變通過基底與納米薄膜之間的粘附力及摩擦力傳遞給納米薄膜,使得薄膜內多處缺陷同時產生應力集中現象,從而使這些缺陷處的局部應力達到該材料的斷裂強度,形成裂紋並擴展,這些擴展的裂紋可能會進一步和其他缺陷相互作用,改變裂紋的傳播路徑,最終形成納米薄膜上無序的斷裂圖案。
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