Confined Growth of ZIF‐8 Nanocrystals with Tunable Structural Colors,Advanced Materials Interfaces

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Confined Growth of ZIF‐8 Nanocrystals with Tunable Structural Colors
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-02-26 , DOI: 10.1002/admi.201701270
Bingdong Chang ₁ , Yuanqing Yang ₂ , Henri Jansen ₁ , Fei Ding ₂ , Kristian Mølhave ₃ , Hongyu Sun ₃

Affiliation

Zeolitic imidazolate frameworks (ZIF‐8) have promising applications as sensors or catalysts due to their highly porous crystalline structures. While most of the previous studies are based on ZIF‐8 crystals either in isolated particles in aqueous environments or in a compact colloidal form, here a facile method is reported to achieve wafer‐based isolated ZIF‐8 nanocrystals to facilitate their integration in microsystems and as surface coatings for catalysis. The fabrication process includes the growth of compact zinc oxide film by atomic layer deposition that functions as the Zn source for the ZIF‐8 synthesis, and the dispersion of gold nanoparticles as inhibitors for the following crystallization transformation of ZIF‐8 crystals. By choosing the concentration of gold nanoparticles, the density of ZIF‐8 nanocrystals can be controlled and the sizes of individual ZIF‐8 crystals can be scaled down to ≈100 nm. A wide range of structural colors generated by the ZIF‐8 nanocrystals is also observed, which can be attributed to the size‐dependent resonant scattering as verified by finite‐difference time‐domain simulations and classical Mie theory. The scalable fabrication of wafer‐based ZIF‐8 nanocrystals empowered with tunable optical properties paves a new way to explore the promising applications in nanophotonics and bionanotechnology.

中文翻译：

具有可调结构颜色的ZIF-8纳米晶体的受限生长

沸石咪唑酸盐骨架（ZIF-8）由于其高度多孔的晶体结构而具有广阔的应用前景，可作为传感器或催化剂。尽管先前的大多数研究都是基于ZIF-8晶体，无论是在水性环境中的分离颗粒中还是以紧凑的胶体形式，但据报道，一种简便的方法可以实现基于晶片的分离ZIF-8纳米晶体，以促进它们在微系统中的集成。作为催化的表面涂层。制造过程包括通过原子层沉积生长致密的氧化锌膜，该原子层沉积充当ZIF-8合成的锌源，金纳米颗粒的分散体作为ZIF-8晶体随后的结晶转变的抑制剂。通过选择金纳米颗粒的浓度，ZIF-8纳米晶体的密度可以控制，单个ZIF-8晶体的尺寸可以缩小到≈100nm。还可以观察到ZIF-8纳米晶体产生的各种结构颜色，这可以归因于大小相关的共振散射，这通过有限差分时域仿真和经典Mie理论进行了验证。具有可调光学特性的基于晶圆的ZIF-8纳米晶体的可扩展制造，为探索纳米光子学和仿生纳米技术中有希望的应用铺平了道路。

更新日期：2018-02-26

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