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This study focuses on the self-assembly and subsequent diamond growth onSiO$_2$ buffered lithium niobate (LiNbO$_3$) and lithium tantalate (LiTaO$_3$)single crystals. The zeta-potential of LNO and LTO single crystal were measuredas 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 LTOto be at pH $\sim$ 3.20. X-ray photoelectron spectroscopy performed on thesurfaces show presence of oxygen groups which may be responsible for thenegative zeta potential of the crystals. Self-assembly of nanodiamond particleson LTO and LNO, using nanodiamond colloid, were studied. As expected, highnanodiamond density was seen when self-assembly was done using a positivelycharged nanodiamond particles. Diamond growth was attempted on the nanodiamondcoated substrates but they were found to be unsuitable for direct growth due todisintegration of substrates in diamond growth conditions.. A $\sim$100nm thicksilicon dioxide layer was deposited on the crystals, followed by nanodiamondself assembly and diamond growth. Thin diamond films were successfully grown onboth coated crystals. The diamond quality was analysed by Raman spectroscopyand atomic force microscopy.

Zeta potential and nanodiamond self assembly assisted diamond growth on lithium niobate and lithium tantalate single crystal