Nanorods Based on Mesoporous Silica Containing Iron Oxide Nanoparticles as Catalytic Nanomotors: Study of Motion Dynamics,ChemNanoMat

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Nanorods Based on Mesoporous Silica Containing Iron Oxide Nanoparticles as Catalytic Nanomotors: Study of Motion Dynamics
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-11-18 , DOI: 10.1002/cnma.202000557
Rafael Mestre ₁ , Núria Cadefau ₁ , Ana C. Hortelão ₁ , Jan Grzelak ₂ , Martí Gich ₂ , Anna Roig ₂ , Samuel Sánchez _{1,

3}

Affiliation

Self‐propelled particles and, in particular, those based on mesoporous silica, have raised considerable interest due to their potential applications in the environmental and biomedical fields thanks to their biocompatibility, tunable surface chemistry and large porosity. Although spherical particles have been widely used to fabricate nano‐ and micromotors, not much attention has been paid to other geometries, such as nanorods. Here, we report the fabrication of self‐propelled mesoporous silica nanorods (MSNRs) that move by the catalytic decomposition of hydrogen peroxide by a sputtered Pt layer, Fe₂O₃ nanoparticles grown within the mesopores, or the synergistic combination of both. We show that motion can occur in two distinct sub‐populations characterized by two different motion dynamics, namely enhanced diffusion or directional propulsion, especially when both catalysts are used. These results open up the possibility of using MSNRs as chassis for the fabrication of self‐propelled particles for the environmental or biomedical fields.

中文翻译：

基于含氧化铁纳米粒子的介孔二氧化硅作为催化纳米马达的纳米棒：运动动力学研究

自推进颗粒，特别是基于中孔二氧化硅的颗粒，由于其生物相容性，可调节的表面化学性质和大孔隙度，由于其在环境和生物医学领域的潜在应用而引起了人们的极大兴趣。尽管球形颗粒已被广泛用于制造纳米和微型电动机，但对其他几何形状（如纳米棒）的关注却很少。在这里，我们报告了自行制造的介孔二氧化硅纳米棒（MSNRs）的制造，该纳米棒通过溅射的Pt层Fe ₂ O ₃催化过氧化氢进行分解而移动在中孔中生长的纳米颗粒，或两者的协同组合。我们表明，运动可以在两个不同的亚群中发生，其特征在于两个不同的运动动力学，即增强的扩散或定向推进，特别是在同时使用两种催化剂时。这些结果开辟了使用MSNR作为底盘来制造用于环境或生物医学领域的自推进颗粒的可能性。

更新日期：2020-11-18

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