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行業動態

納米間隙電極傳感器件研究獲進展

文字:[大][中][小] 手機頁面二維碼 2016/8/19     瀏覽次數:    

  日前,中科院合肥研究院智能所研究員劉錦淮和黃行九帶領課題組,在納米間隙電極傳感器件的研究中取得重要進展。
  納米間隙電極傳感器件的突出特點,是可直接將待測物質的某種特性轉化為更簡潔、更直觀的電信號——如電阻、阻抗等,以實現對目標分子的痕量、高靈敏度檢測。其中,針對痕量的待測目標分子,如何獲得增強、有效的信號一直是研究熱點之一。智能所研究人員運用金納米顆粒構筑了納米間隙電極,提出了兩種檢測新思路。
  首先,他們通過在納米間隙電極間引入硒化鎘量子點,有效提高了有機分子鏈霉親和素檢測的靈敏度與信號強度。同時,他們采用電化學阻抗譜和循環伏安法,進一步證實了在紫外可見光照下信號顯著增強效應;停止光照后,電化學阻抗值恢復到未加光照的水平。這些發現表明硒化鎘量子點的信號增強作用是可靠且可逆的。該研究結果近期發表于國際納米材料雜志《微尺度》,并被選為當期封面。
  相反,研究人員將環糊精組裝到金納米顆粒表面,利用環糊精分子(CD)空腔對多氯聯苯分子(PCBs)的捕獲作用,提出了另一種“抑制電荷輸運”式檢測新方法,即當不良介電性質的多氯聯苯分子進入到環糊精分子空腔后,測量的電流信號強度顯示出明顯下降。采用該方法對多氯聯苯的最低檢測濃度可達1納米。此成果發表在美國化學會《分析化學》雜志上。
  據悉,上述研究工作獲得國家“973”計劃項目、國家自然科學基金委重大研究計劃“納米制造的基礎研究”、中科院“百人計劃”等項目的支持。
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