期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 10, 页码 5857-5862出版社
AMER CHEMICAL SOC
DOI: 10.1021/am509056b
关键词
black phosphorus; layered materials; Raman spectroscopy; phonon vibrations; thermal effect
资金
- Department of Science and Technology (Government of India) under a Ramanujan Fellowship [SR/S2/RJN-130/2012]
- NCL-MLP project [028626]
- DST-SERB Fast-track Young scientist project [SB/FT/CS-116/2013]
- Board of Research in Nuclear Sciences (BENS) (Government of India)
- INUP IITB project - DeitY, MCIT, Government of India
Atomically thin two-dimensional (2D) sheets of black phosphorus have attracted much attention due to their potential for future nanoelectronic and photonics device applications. Present investigations deal with the temperature dependent phonon shifts in a few-layer black phosphorus nanosheet sample prepared using micromechanical exfoliation on a 300 nm SiO2/Si substrate. The temperature dependent Raman spectroscopy experiments were carried out on a few-layer black phosphorus sample, which depicts softening of Ag-1 B-2g, and A(g)(2) modes as temperature increases from 77 to 673 K. The calculated temperature coefficients for Ag-1, B-2g, and A(g)(2) modes of the few-layer black phosphorus nanosheet sample were observed to be -0.01, -0.013, and -0.014 cm(-1) K-1, respectively. The temperature dependent softening modes of black phosphorus results were explained on the basis of a double resonance process which is more active in an atomically thin sample. This process can also be fundamentally pertinent in other promising and emerging 2D ultrathin layer and heterostructured materials.
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