Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa
Synthesis of nano-polycrystalline diamond from glassy carbon at pressures up to 25 GPa
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在高达 25 GPa 的压力下由玻璃碳合成纳米多晶金刚石
DOI：
10.1080/08957959.2019.1702658
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发表时间：
2019
影响因子：
2
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Irifune;T.;Ueda;C.;Ohshita;S.;Ohfuji;H.;Kunimoto;T. and Shinmei;T.
对高压高温合成的纳米多晶金刚石（NPD）进行了深紫外连续波光致发光谱研究。NPD表现出清晰的深紫外发射，这源于本征激子跃迁的动量守恒声子与光子的帮助。令人惊讶的是，峰值发射能量比单晶金刚石高约30 meV。拉曼散射光谱表明，能量差应源于激子性质的NPD，而不是声子。因此，与单晶金刚石相比，NPD具有大的带隙。
Deep-ultraviolet continuous-wave photoluminescence spectroscopy is performed for nano-polycrystalline diamond (NPD) synthesized by a high pressure high-temperature technique. NPD exhibits clear deep-ultraviolet emissions, which originate from intrinsic excitonic transitions assisted by a momentum-conserving phonon with a photon. Surprisingly, the peak emission energy is about 30 meV higher than that of the single-crystalline diamond. Raman scattering spectroscopy indicates that the energy difference should originate from the excitonic properties of the NPD and not the phonon. Hence, NPD has a large bandgap compared to single-crystalline diamond.