论文标题
在高压下合成的超小纳米符号的尺寸依赖的热稳定性和光学特性
Size-dependent thermal stability and optical properties of ultra-small nanodiamonds synthesized under high pressure
论文作者
论文摘要
到量子大小区域的钻石性能仍然很少了解。高压高温度（HPHT）从氯丹甘烷分子中的合成可以精确控制纳米座的大小。研究了尺寸范围从$ <$ 1到8 nm的纳米符号的热稳定性和光学性能。结果表明，关于小于2 nm的纳米符号增强的热稳定性的假设是不正确的。这些样品的IR吸收最引人注目的功能是钻石拉曼模式附近增强的变速箱带的外观（1332 cm $^{ - 1} $）。在先前提出的解释之后，我们将这种现象归因于钻石拉曼模式和导电表面状态的连续性引起的FANO效应。我们假设这些表面状态可以通过在纳米符号表面上重建断裂的键来形成。该作用还导致观察到的拉曼散射峰的不对称性。提出了HPHT合成中纳米原子形成的机理，解释了其结构和特性的特性。
Diamond properties down to the quantum-size region are still poorly understood. High-pressure high-temperature (HPHT) synthesis from chloroadamantane molecules allows precise control of nanodiamond size. Thermal stability and optical properties of nanodiamonds with sizes spanning range from $<$1 to 8 nm are investigated. It is shown that hypothesis about enhanced thermal stability of nanodiamonds smaller than 2 nm is incorrect. The most striking feature in IR absorption of these samples is the appearance of an enhanced transmission band near the diamond Raman mode (1332 cm$^{-1}$). Following previously proposed explanation, we attribute this phenomenon to the Fano-effect caused by resonance of diamond Raman mode with continuum of conductive surface states. We assume that these surface states may be formed by reconstruction of broken bonds on the nanodiamond surfaces. This effect is also responsible for the observed asymmetry of Raman scattering peak. he mechanism of nanodiamond formation in HPHT synthesis is proposed, explaining pecularities of their structure and properties.
