<br>BiVO4作为光催化活性物质的研究,Accounts of Materials Research

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BiVO4作为光催化活性物质的研究
Accounts of Materials Research ( IF 14.0 ) Pub Date : 2024-03-15 , DOI: 10.1021/accountsmr.3c00021
Sandra Heckel ₁ , Martin Wittmann ₁ , Marc Reid ₂ , Katherine Villa ₃ , Juliane Simmchen ₁

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光催化材料越来越受欢迎，并为开发光驱动微电机而进行研究投资。虽然大多数早期工作都使用高度稳定的 TiO ₂作为构建微电机的材料，并且大多与贵金属结合使用，但其他半导体提供了更广泛的特性，包括不受高能紫外线的影响。本次综述重点关注我们与 BiVO ₄的合作，BiVO 4 由于其带隙小且具有吸收蓝光的能力而显示出前景。此外，这种盐明确的晶体结构导致不同晶面上可利用的电荷分离，提供足够的不对称性以产生主动推进。这些特性产生了令人着迷的物理和化学行为，表明活性物质可以变得多么丰富和多变。在这里，我们介绍了不同 BiVO ₄微粒的合成及其材料特性，这些特性使它们成为活性微电机的绝佳候选者。了解本质上不对称微电机的一个关键因素是了解其流场。然而，由于它们的尺寸很小，并且需要使用更小的示踪粒子来避免扰动流场，因此在微尺度上测量流场是一项艰巨的任务。我们还展示了这些初步结果，这使我们能够证明化学反应性与产生的流动之间的相关性，从而导致主动运动。由于 BiVO ₄的无毒性质，这些可见光响应微型游泳器已被用于研究应用的第一步，甚至在食品技术等敏感领域也是如此。尽管这些初步测试还远未实现，但我们必须面对这样一个事实：单个微型游泳者将无法执行宏观任务。因此，我们向读者展示了集体运动的第一个简单研究，希望对该领域有许多新的贡献。 BiVO ₄的一步合成显然为需要大量粒子的研究铺平了道路。我们预测，易于大量合成的无毒材料的有前景的应用组合将为推动活性物质领域超越概念验证阶段做出关键贡献。

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An Account on BiVO4 as Photocatalytic Active Matter

Photocatalytic materials are gaining popularity and research investment for developing light-driven micromotors. While most of the early work used highly stable TiO₂ as a material to construct micromotors, mostly in combination with noble metals, other semiconductors offer a wider range of properties, including independence from high-energy UV light. This review focuses on our work with BiVO₄ which has shown promise due to its small band gap and resulting ability to absorb blue light. Additionally, this salt's well-defined crystal structures lead to exploitable charge separation on different crystal facets, providing sufficient asymmetry to cause active propulsion. These properties have given rise to fascinating physical and chemical behaviors that show how rich and variable active matter can become. Here, we present the synthesis of different BiVO₄ microparticles and their material properties that make them excellent candidates as active micromotors. A critical factor in understanding inherently asymmetric micromotors is knowledge of their flow fields. However, due to their small size and the need to use even smaller tracer particles to avoid perturbing the flow field, measuring flow fields at the microscale is a difficult task. We also present these first results, which allow us to demonstrate the correlation between chemical reactivity and the flow generated, leading to active motion. Due to the nontoxic nature of BiVO₄, these visible-light-responsive microswimmers have been used to study the first steps toward applications, even in sensitive areas such as food technology. Although these initial tests are far from being realized, we have to face the fact that a single microswimmer will not be able to perform macroscale tasks. Therefore, we present the reader with the first simple studies of collective motion, hoping for many new contributions to the field. The one-step synthesis of BiVO₄ clearly paves the way for studies requiring large numbers of particles. We predict that the combination of promising applications for a nontoxic material which is readily synthesized in large quantities will contribute pivotally to advance the field of active matter beyond the proof-of-concept stage.

更新日期：2024-03-15

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