Zeta电位与纳米金刚石自组装辅助的铌酸锂和钽酸锂单晶上金刚石生长
Zeta potential and nanodiamond self assembly assisted diamond growth on lithium niobate and lithium tantalate single crystal
AI总结：
本研究通过测量Zeta电位、利用纳米金刚石自组装，并在铌酸锂和钽酸锂单晶上沉积SiO₂缓冲层，成功生长出薄金刚石膜，并用拉曼光谱和原子力显微镜表征了质量。
摘要：
本研究聚焦于在SiO$_2$缓冲的铌酸锂（LiNbO$_3$）和钽酸锂（LiTaO$_3$）单晶上的自组装及随后的金刚石生长。测量了LNO和LTO单晶的Zeta电位随pH值的变化。发现它们在pH 3.5-9.5范围内带负电。LNO的等电点位于pH $\sim$ 2.91，LTO的等电点位于pH $\sim$ 3.20。对表面进行的X射线光电子能谱分析显示存在氧基团，这可能是晶体产生负Zeta电位的原因。使用纳米金刚石胶体研究了纳米金刚石颗粒在LTO和LNO上的自组装。正如预期，当使用带正电的纳米金刚石颗粒进行自组装时，观察到高密度的纳米金刚石。尝试在涂覆纳米金刚石的基底上进行金刚石生长，但由于基底在金刚石生长条件下分解，发现它们不适合直接生长。在晶体上沉积了约100nm厚的二氧化硅层，随后进行纳米金刚石自组装和金刚石生长。在两个涂覆的晶体上均成功生长出薄金刚石膜。通过拉曼光谱和原子力显微镜分析了金刚石质量。
英文摘要：
This study focuses on the self-assembly and subsequent diamond growth on SiO$_2$ buffered lithium niobate (LiNbO$_3$) and lithium tantalate (LiTaO$_3$) single crystals. The zeta-potential of LNO and LTO single crystal were measured as a function of pH. They were found to be negative in the pH range 3.5-9.5. The isoelectric point for LNO was found to be at pH $\sim$ 2.91 and that of LTO to be at pH $\sim$ 3.20. X-ray photoelectron spectroscopy performed on the surfaces show presence of oxygen groups which may be responsible for the negative zeta potential of the crystals. Self-assembly of nanodiamond particles on LTO and LNO, using nanodiamond colloid, were studied. As expected, high nanodiamond density was seen when self-assembly was done using a positively charged nanodiamond particles. Diamond growth was attempted on the nanodiamond coated substrates but they were found to be unsuitable for direct growth due to disintegration of substrates in diamond growth conditions.. A $\sim$100nm thick silicon dioxide layer was deposited on the crystals, followed by nanodiamond self assembly and diamond growth. Thin diamond films were successfully grown on both coated crystals. The diamond quality was analysed by Raman spectroscopy and atomic force microscopy.
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