Gómez-Pérez Juan, Barna Balázs, Tóth Ildikó Y, Kónya Zoltán, Kukovecz Ákos
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary.
SZTE "Lendület" Porous Nanocomposites Research Group, Rerrich Béla tér 1, H-6720 Szeged, Hungary.
ACS Omega. 2018 Oct 3;3(10):12482-12488. doi: 10.1021/acsomega.8b01989. eCollection 2018 Oct 31.
Previous theoretical reports have described the oxidation of few-layer black phosphorus and its effects on the electronic properties. Theoretically, native oxide layers bring opportunities for band gap engineering, but the detection of the different types of oxides is still a challenge at the experimental level. In this work, we uncover a correlation between thermal processes and Raman shift for the A , B, and A vibrational modes. The thermal expansion coefficients (temperature range, 290-485 K) for the A , B, and A were -0.015, -0.027, and -0.028 cm K, respectively. Differential scanning calorimetry analysis shows an endothermic process centered at 528 K, and it was related with a mass increase according to thermogravimetric analysis. Raman shift temperature dependence was correlated to theoretical lattice thermal expansion, and a significant deviation was detected in the stacking direction at 500 K.
先前的理论报告描述了少层黑磷的氧化及其对电子性质的影响。从理论上讲，原生氧化层为带隙工程带来了机遇，但在实验层面检测不同类型的氧化物仍然是一项挑战。在这项工作中，我们发现了A、B和A振动模式的热过程与拉曼位移之间的相关性。A、B和A的热膨胀系数（温度范围为290 - 485 K）分别为-0.015、-0.027和-0.028 cm K。差示扫描量热法分析显示有一个以528 K为中心的吸热过程，根据热重分析，这与质量增加有关。拉曼位移与温度的依赖性与理论晶格热膨胀相关，并且在500 K时在堆叠方向检测到显著偏差。
