CAJ | 학술논문

利用常压化学气相沉积（CVD）法制备大面积单层石墨烯，并分别转移一层和三层至蓝宝石基底表面。采用共焦拉曼光谱仪对样片表面多点进行测量，以表征不同位置转移石墨烯的层数、缺陷与连续性。考虑石墨烯在红外波段的自由载流子吸收和泡利阻塞效应，计算得到光电导率随波长变化的曲线。利用傅里叶变换红外光谱仪对石墨烯样品中波红外（3～5?m）透过率进行了测试，结果表明其在中波红外存在明显的泡利阻塞效应。实测的单层石墨烯中波红外相对透过率为98.5%，明显高于可见区域。三层石墨烯的相对透过率也与仿真结果相仿。由此可见，石墨烯将有望弥补ITO在中波红外透明窗口电磁屏蔽应用方面的不足。
이용상압화학기상침적（CVD）법제비대면적단층석묵희，병분별전이일층화삼층지람보석기저표면。채용공초랍만광보의대양편표면다점진행측량，이표정불동위치전이석묵희적층수、결함여련속성。고필석묵희재홍외파단적자유재류자흡수화포리조새효응，계산득도광전도솔수파장변화적곡선。이용부리협변환홍외광보의대석묵희양품중파홍외（3～5?m）투과솔진행료측시，결과표명기재중파홍외존재명현적포리조새효응。실측적단층석묵희중파홍외상대투과솔위98.5%，명현고우가견구역。삼층석묵희적상대투과솔야여방진결과상방。유차가견，석묵희장유망미보ITO재중파홍외투명창구전자병폐응용방면적불족。
A large area of monolayer graphene was prepared by the method of ambient pressure chemical vapor deposition(CVD). In order to characterize the transmission spectroscopy of graphene in MWIR, we transferred one or three layers graphene on sapphire, which has a high transmittance at this region. Using confocal Raman spectroscopy to measure multi points on sample surface, we obtained the situation of transferred graphene layers, defects and continuity. The effect of Pauli blocking and free carrier absorption was taken into account, by which we calculated the wavelength dependence curve of optical conductivity. The transmittance of graphene samples in MWIR(3~5?m)was tested by Fourier transform infrared spectroscopy. The results indicated that the transmittance of monolayer graphene is 98.5% much higher than which in visible region. The experimental data of tri-layer graphene is consistent with the simulation. Therefore, graphene is expected to make up for the deficiency of ITO as transparent electromagnetic shielding material in MWIR.