Late Dattatray J
Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Babha Road, Pune 411008, Maharashtra State, India.
ACS Appl Mater Interfaces. 2015 Mar 18;7(10):5857-62. doi: 10.1021/am509056b. Epub 2015 Mar 6.
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), B2g, and Ag(2) modes as temperature increases from 77 to 673 K. The calculated temperature coefficients for Ag(1), B2g, and Ag(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.
原子级薄的二维黑磷片层因其在未来纳米电子和光子器件应用中的潜力而备受关注。目前的研究涉及在300 nm SiO2/Si衬底上通过微机械剥离制备的几层黑磷纳米片样品中的温度依赖声子位移。对几层黑磷样品进行了温度依赖拉曼光谱实验，结果表明，随着温度从77 K升高到673 K，Ag(1)、B2g和Ag(2)模式发生软化。几层黑磷纳米片样品的Ag(1)、B2g和Ag(2)模式的计算温度系数分别为-0.01、-0.013和-0.014 cm(-1) K(-1)。基于在原子级薄样品中更活跃的双共振过程，解释了黑磷的温度依赖软化模式。该过程在其他有前景的新兴二维超薄层和异质结构材料中也可能具有根本相关性。
