Directed covalent assembly of nanodiamonds into thin films
Directed covalent assembly of nanodiamonds into thin films
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DOI：
10.1016/j.diamond.2019.107605
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发表时间：
2020-01-01
影响因子：
4.1
通讯作者：
Radadia, Adarsh D.
中科院分区：
文献类型：
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作者：
Patoary, Naim H.;Rai, Amit;Radadia, Adarsh D.
多晶金刚石薄膜的广泛应用受到与化学气相沉积、高生长温度和差的基底粘附性相关的成本的限制。在这里，一个溶液相的方法来生长纳米金刚石薄膜，证明通过羧化的纳米金刚石和胺官能化的基板上的二胺连接剂的二甲酰亚胺介导的环状连接。XPS和拉曼光谱证实了所需酰胺键的形成和连接体的掺入以形成共价键合的纳米颗粒网络。在溶液相中以及通过旋涂证明了组装过程，这两种方法导致使用SEM和AFM观察到的类似的膜形态。组装过程使膜为胺封端的，这便于应用特定的表面改性。通过3 Ω方法测量的共价组装的ND的热导率范围在2和20 W m（-1）K-1之间，这与类似晶粒尺寸的CVD纳米晶金刚石膜的热导率相当。在定向共价组装策略期间降低孔隙率的未来策略对于需要热耗散或机械和化学稳定性的应用具有强大的潜力。
The wide-spread use of polycrystalline diamond thin films is limited by the costs associated with chemical vapor deposition, high growth temperature, and poor substrate adhesion. Here, a solution-phase method to grow nanocrystalline diamond films is demonstrated through carbodiimide-mediated cyclic attachment of carboxylated nanodiamonds and a diamine linker on amine-functionalized substrates. XPS and Raman spectroscopy confirm formation of the desired amide bonds and incorporation of the linker to form the covalently-bonded nanoparticle network. The assembly process was demonstrated in solution phase as well as via spin coating with both methods resulting in similar film morphology as observed using SEM and AFM. The assembly process leaves the films amine-terminated, which is convenient for application-specific surface modifications. The thermal conductivity of the covalently assembled NDs as measured via the 3 omega method ranged between 2 and 20 W m(-1) K-1, which is comparable to those of CVD nanocrystalline diamond films of similar grain size. Future strategies to reduce porosity during the directed covalent assembly strategy hold strong potential for applications requiring thermal dissipation or mechanical and chemical stability.