Laboratoire de Physique de la Matiere Condensee (PMC), CNRS - Ecole Polytechnique, F-91128 Palaiseau cedex, France.
ACS Appl Mater Interfaces. 2009 Dec;1(12):2738-46. doi: 10.1021/am900458g.
Nanodiamond (ND) seeding is a well-established route toward the CVD (chemical vapor deposition) synthesis of diamond ultrathin films. This method is based on the deposition onto a substrate of diamond nanoparticles which act as pre-existing sp(3) seeds. Here, we report on a straightforward method to disperse diamond nanoparticles on a substrate by taking advantage of the electrostatic interactions between the nanodiamonds and the substrate surface coated with a cationic polymer. This layer-by-layer deposition technique leads to reproducible and homogeneous large-scale nanoparticle deposits independent of the substrate's nature and shape. No specific functionalization of the nanoparticles is required, and low concentrated solutions can be used. The density of NDs on the substrate can be controlled, as shown by in situ ATR-FTIR (attenuated total reflection Fourier transform infrared) analysis and QCM (quartz crystal microbalance) measurements. Highly dense and compact ND deposits can be obtained, allowing CVD growth of nanocrystalline diamond ultrathin films (70 nm) on various substrates. The synthesis of 3D structured and patterned diamond thin films has also been demonstrated with this method.
纳米金刚石（ND）成核是 CVD（化学气相沉积）合成金刚石超薄薄膜的一种成熟方法。该方法基于在基底上沉积金刚石纳米颗粒，这些纳米颗粒作为预先存在的 sp(3)种子。在这里，我们报告了一种通过利用纳米金刚石与涂覆有阳离子聚合物的基底表面之间的静电相互作用在基底上分散金刚石纳米颗粒的简单方法。这种层层沉积技术可实现可重复且均匀的大规模纳米颗粒沉积，而与基底的性质和形状无关。不需要对纳米颗粒进行特定的功能化，并且可以使用低浓度的溶液。通过原位 ATR-FTIR（衰减全反射傅里叶变换红外）分析和 QCM（石英晶体微天平）测量可以控制基底上 ND 的密度。可以获得高密度和紧密的 ND 沉积物，从而可以在各种基底上生长纳米晶金刚石超薄薄膜（70nm）。还通过该方法证明了 3D 结构和图案化金刚石薄膜的合成。
