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Probing the Domain Architecture in 2D α‐Mo2C via Polarized Raman Spectroscopy
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-07 , DOI: 10.1002/adma.201807160 Tianshu Li 1 , Weijun Luo 2 , Hikari Kitadai 2 , Xingzhi Wang 2 , Xi Ling 1, 2, 3
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-07 , DOI: 10.1002/adma.201807160 Tianshu Li 1 , Weijun Luo 2 , Hikari Kitadai 2 , Xingzhi Wang 2 , Xi Ling 1, 2, 3
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MXenes are emerging 2D materials with intriguing properties such as excellent stability and high conductivity. Here, a systematic study on the Raman spectra of 2D α‐Mo2C (molybdenum carbide), a promising member in MXene family, is conducted. Six experimentally observed Raman modes from ultrathin α‐Mo2C crystal are first assigned with the assistance of phonon dispersion calculated from density functional theory. Angle‐resolved polarized Raman spectroscopy indicates the anisotropy of α‐Mo2C in the b–c plane. Raman spectroscopy is further used to study the unique domain structures of 2D α‐Mo2C crystals grown by chemical vapor deposition. A Raman mapping investigation suggests that most of the α‐Mo2C flakes contain multiple domains and the c‐axes of neighboring domains tend to form a 60° or 120° angle, due to the weak MoC bonds in this interstitial carbide and the low formation energy of the carbon chains along three equivalent directions. This study demonstrates that polarized Raman spectroscopy is a powerful and effective way to characterize the domain structures in α‐Mo2C, which will facilitate the further exploration of the domain‐structure‐related properties and potential applications of α‐Mo2C.
中文翻译：
通过极化拉曼光谱探测二维α-Mo2C中的域架构
MXene是新兴的2D材料，具有令人着迷的特性，例如出色的稳定性和高电导率。这里，2Dα-Mo的拉曼光谱系统的研究2 C（碳化钼），在家庭MXene有希望的构件，被传导。六个实验上观察到从超薄α-沫拉曼模式2 C型晶体首先分配了从密度泛函理论计算声子色散的协助。角分辨偏振拉曼光谱表明b – c平面中α‐Mo 2 C的各向异性。拉曼光谱进一步用于研究2D α‐Mo 2的独特域结构通过化学气相沉积生长的C晶体。拉曼映射调查表明，大多数α-沫的2 Ç薄片包含多个域和C ^相邻结构域的-axes倾向于形成一个60°或120°的角度，由于弱沫在此间质性碳化物C键和碳链沿三个等效方向的低形成能。这项研究表明，偏振拉曼光谱是一种强大的和有效的方式来表征α-沫域结构2 C，这将有利于结构域-结构相关的性质和α-Mo系的潜在应用的进一步探索2 C.
更新日期：2019-01-07
中文翻译：
通过极化拉曼光谱探测二维α-Mo2C中的域架构
MXene是新兴的2D材料，具有令人着迷的特性，例如出色的稳定性和高电导率。这里，2Dα-Mo的拉曼光谱系统的研究2 C（碳化钼），在家庭MXene有希望的构件，被传导。六个实验上观察到从超薄α-沫拉曼模式2 C型晶体首先分配了从密度泛函理论计算声子色散的协助。角分辨偏振拉曼光谱表明b – c平面中α‐Mo 2 C的各向异性。拉曼光谱进一步用于研究2D α‐Mo 2的独特域结构通过化学气相沉积生长的C晶体。拉曼映射调查表明，大多数α-沫的2 Ç薄片包含多个域和C ^相邻结构域的-axes倾向于形成一个60°或120°的角度，由于弱沫在此间质性碳化物C键和碳链沿三个等效方向的低形成能。这项研究表明，偏振拉曼光谱是一种强大的和有效的方式来表征α-沫域结构2 C，这将有利于结构域-结构相关的性质和α-Mo系的潜在应用的进一步探索2 C.
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