ridm@nrct.go.th   ระบบคลังข้อมูลงานวิจัยไทย   รายการโปรดที่คุณเลือกไว้

Evolution of Raman G and G′ (2D) modes in folded graphene layers

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Evolution of Raman G and G′ (2D) modes in folded graphene layers
นักวิจัย : Cong, Chunxiao , Yu, Ting
คำค้น : DRNTU::Science::Physics , DRNTU::Science::Mathematics
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : Cong, C., & Yu, T. (2014). Evolution of Raman G and G′ (2D) modes in folded graphene layers. Physical Review B, 89(23), 235430-. , 1098-0121 , http://hdl.handle.net/10220/20326 , http://dx.doi.org/10.1103/PhysRevB.89.235430
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Bernal- and non-Bernal-stacked graphene layers have been systematically studied by Raman imaging and spectroscopy. Two dominant Raman modes, G and G ′ (or 2D ), of folded graphene layers exhibit three types of spectral features when interlayer lattice mismatches, defined by a rotational angle varies. Among these folded graphene layers, the most interesting one is the folded graphene layers that present an extremely strong G mode enhanced by a twist-induced Van Hove singularity. The evolution of Raman G and G ′ modes of such folded graphene layers are probed by changing the excitation photon energies. In this paper, doublet splitting of the G ′ mode in a folded double-layer (1 + 1) and of the G mode in a folded tetralayer (2 + 2) graphene are observed and discussed. The G ′ mode splitting in folded double-layer graphene is attributed to the coexistence of inner and outer scattering processes and the trigonal warping effect as well as further downward bending of the inner dispersion branch at a visible excitation energy. The two peaks of the G mode in folded tetralayer graphene are assigned to Raman-active mode (E 2g ) and lattice mismatch activated infrared-active mode (E 1u ), which is further verified by the temperature-dependent Raman measurements. Our study provides a summary and discussion of Raman spectra of Bernal- and non-Bernal-stacked graphene layers and further demonstrates the versatility of Raman spectroscopy for exploiting electronic band structures of graphene layers.

บรรณานุกรม :
Cong, Chunxiao , Yu, Ting . (2557). Evolution of Raman G and G′ (2D) modes in folded graphene layers.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Cong, Chunxiao , Yu, Ting . 2557. "Evolution of Raman G and G′ (2D) modes in folded graphene layers".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Cong, Chunxiao , Yu, Ting . "Evolution of Raman G and G′ (2D) modes in folded graphene layers."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2557. Print.
Cong, Chunxiao , Yu, Ting . Evolution of Raman G and G′ (2D) modes in folded graphene layers. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2557.