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利用二段式常壓化學氣相沉積法在絕緣基板上合成免轉移石墨烯

Transfer-Free Synthesis of Graphene on Insulating Substrates by Two-Step APCVD

摘要


利用常壓化學氣相沉積(atmospheric pressure chemical vapor deposition)與鎳金屬催化經過兩階段升溫在二氧化矽(SiO_2)上直接成長具有公分大小的免轉移石墨烯。從拉曼光譜(Raman spectrum)與大面積(12 × 12μm^2)拉曼影像(Raman mapping)分析得知,免轉移石墨烯具有低缺陷與高均勻性(~90%單層結構)。在低溫(75 K)與室溫(300 K)的載子遷移率(carrier mobility)分別為~11300 cm^2/V.s 與~750 cm^2/V.s,同時與溫度(T)的n次方(2 < n < 4)呈負相關,暗示著高能量聲子(phonon)造成更多的電子散射。本研究在二氧化矽基板上實現大面積、無轉移石墨烯的成長,有望提升石墨烯相關電子元件的商用化機會。

並列摘要


A cm-sized transfer-free graphene was grown directly on SiO_2 with a Ni-catalyzed atmospheric pressure chemical vapor deposition (APCVD) and a two-step thermal annealing process. According to Raman spectrum and a large sized (12 × 12 μm^2) Raman mapping, the transfer-free graphene shows low defects and high uniformity (~90% single-layer structure). The carrier mobility at 75 K and 300 K are ~11300 and ~750 cm^2/V.s, respectively. Moreover, the carrier mobility shows the negative correlation with T^n (2<n<4), indicating that high energy phonons assited more electron scattering. This study demonstrates the large-area and transfer-free graphene grown on SiO_2 substrates, which is expected to increase the commercialization possibilities of graphene-based electronic devices.

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