我們成功合成出尺寸可調控的四面體碘化亞銅奈米晶體，尺寸範圍介於56奈米至645奈米之間。碘化亞銅四面體在掃描式電子顯微鏡及穿透式電子顯微鏡的觀察下，可以確保其形狀邊角完整且表面平滑。在粉末式X射線繞射分析中，我們可以得知其屬於面心立方晶系。此外，在選區繞射圖、X射線能譜圖及X射線光電子能譜圖中，我們可以再次驗證合成出來的奈米粒子為具有{111}晶面的碘化亞銅奈米晶體。在紫外光可見光漫反射光譜圖中，我們可以觀察到碘化亞銅四面體在光學上有尺寸及晶面效應。碘化亞銅四面體的能隙會隨著尺寸愈大而有略微紅位移的現象。相比於大顆的碘化亞銅四面體和市售的碘化亞銅粉末，在1,3-偶極環加成反應中，顯露{111}晶面且尺寸為56奈米的碘化亞銅四面體擁有最佳的有機催化活性，展現出我們所合成的碘化亞銅奈米晶體在有機催化應用上的優勢。

We have successfully synthesized size-tunable tetrahedral CuI nanocrystals ranging from 56 nm to 645 nm. SEM and TEM images show that our tetrahedral nanoparticles have sharp edges and smooth surfaces. PXRD patterns confirm a face-centered cubic lattice for CuI. Moreover, SAED patterns, EDS elemental mapping images, and HRXPS spectra confirm that our synthesized nanocrystals are CuI bound by the {111} facets. UV–vis DRS results reveal that the CuI tetrahedra exhibit size- and facet-dependent optical properties. The band gap of CuI is slightly red-shifted with increasing sizes. In click reaction, {111}-bound 56 nm CuI tetrahedra achieved the best product yield compared to those larger tetrahedra and commercial CuI powder, demonstrating the advantage of using these designed CuI for catalytic applications.

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