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R88M-WP40030T-BW密西根理工大學日前與美國橡樹嶺國家實驗室(ORNL)共同發(fā)表具有金量子點(QD)的BNNT，使其一種像穿隧電晶體一樣電子可在量子點之間跳躍的元件；這篇名為“帶金量子點功能的BNNT室溫穿隧行為”(Room-Temperature Tunneling Behavior of Boron Nitride Nanotubes Functionalized with Gold Quantum Dots)的報告已經(jīng)發(fā)表在《先進材料》(Advanced Materials)期刊中。
　　研究人員在發(fā)現(xiàn)石墨烯具有相容于氮化硼的晶格結(jié)構(gòu)后，除去了在其介面上的電子散射，他們認為可共同利用于創(chuàng)造出像電晶體般行為的異質(zhì)接面。
　　R88M-WP40030T-BW結(jié)合石墨烯(灰色)的化學結(jié)構(gòu)與BNNT(粉紅和紫色)，成為打造無半導體數(shù)位交換器的關(guān)鍵。
“我們最先發(fā)布于2013年《先進材料》中的首項成果是基于金量子點之間的量子穿隧行為。量子點之間的實體間隙主要用于制作阻止電子流的潛在障礙(“關(guān)斷”狀態(tài))，”Yap 說。“目前針對石墨烯-BNNT異質(zhì)接面的研究，由于半金屬石墨烯與寬能隙BNNT之間的狀態(tài)密度(DOS)不匹配，形成防止電流流經(jīng)接面(“關(guān)斷”狀態(tài))的穿隧阻障層。在充份施加電場后，彎曲能帶使量子穿隧跨越阻障層，從而開啟了開關(guān)。”
　　R88M-WP40030T-BW為了實現(xiàn)石墨烯/氮化硼異質(zhì)接面，研究團隊在剝落的石墨烯單層蝕刻針孔，并從中生長BNNT——由于晶格匹配——使其分別形成電晶體般的異質(zhì)接面。在以掃瞄電子顯微鏡(SEM)即時監(jiān)測期間，室溫下以四探針掃瞄穿隧顯微鏡(STM)進行特性化后，研究人員們發(fā)現(xiàn)僅開啟0.5V電壓時的交換率高達105。Yap認為，新的特性是在利用密度泛函理論(DFT)模擬后由于DOS不匹配所致。
　　灰色石墨導電基底可生長絕緣的BNNT，從而形成無半導體電晶體的異質(zhì)接面。

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