Surface‐Initiated Redox Route to Hollow MnO2 Nanostructures,ChemNanoMat

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Surface‐Initiated Redox Route to Hollow MnO2 Nanostructures
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-05-25 , DOI: 10.1002/cnma.202000246
Yaocai Bai _{1,

2} , Xiaxi Yao ₃ , Xiaojing Wang _{1,

2} , Yadong Yin _{1,

2}

Affiliation

Nanostructured MnO₂ are gaining great research interest because of their wide applications ranging from optical and electronic devices to energy storage and catalysis. However, the formation of a well‐defined MnO₂ coating on the surface of various colloidal objects has been challenging due to surface incompatibility. Here, we report a unique and robust surface‐initiated redox route to the controlled deposition of MnO₂ on colloidal particles, which can be employed to produce high‐quality hollow MnO₂ nanoshells and a variety of MnO₂ coated nanocomposites. Colloidal resorcinol formaldehyde (RF) resin spheres serve as both reducing agents and sacrificial templates to initiate the controlled deposition of MnO₂ on their surfaces. Further, the RF resin can also be coated on the surface of other colloidal nanostructures to allow overcoating of MnO₂ through the redox reaction and produce nanocomposites such as SiO₂@MnO₂ and Au@MnO₂. The size and thickness of the MnO₂ nanoshells can be tuned precisely to induce resonant Mie scattering, leading to bright colorations that can shift reversibly in response to the changes in the refractive index of the surroundings.

中文翻译：

表面引发的氧化还原途径形成空心MnO2纳米结构

纳米结构的MnO ₂由于在光学和电子设备到能量存储和催化等领域的广泛应用而获得了极大的研究兴趣。然而，由于表面不相容性，在各种胶体表面形成清晰的MnO ₂涂层一直是一项挑战。在这里，我们报告了一种独特且稳定的表面引发氧化还原途径，可控制MnO ₂在胶体颗粒上的沉积，可用于生产高质量的中空MnO ₂纳米壳和各种MnO ₂包覆的纳米复合材料。胶体间苯二酚甲醛（RF）树脂球既充当还原剂又是牺牲模板，以启动MnO的受控沉积₂在其表面上。此外，RF树脂还可以涂覆在其他胶体纳米结构的表面上，以允许通过氧化还原反应对MnO ₂进行包覆，并产生纳米复合物，例如SiO ₂ @MnO ₂和Au @ MnO ₂。可以精确地调整MnO ₂纳米壳的大小和厚度，以引起共振Mie散射，从而导致明亮的色彩可以响应于周围折射率的变化而可逆地移动。

更新日期：2020-05-25

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