Centre for Nanoscience and Engineering, Indian Institute of Science, Bengaluru 560012, India.
ACS Appl Bio Mater. 2021 Sep 20;4(9):6903-6911. doi: 10.1021/acsabm.1c00605. Epub 2021 Aug 12.
Antimicrobial surfaces can reduce the spread of bacteria from high-touch surfaces, saving millions of lives worldwide. Antibacterial photocatalytic films, like TiO, are widely reported but limited in practice because they need high-intensity UV light. More practical but less reported are photocatalysts that work under low-intensity visible light from an indoor lamp. Here, we demonstrate that manganese vanadium oxide (MVO) is an antibacterial photocatalyst that works under light-emitting diode (LED) lights at ∼3000 lux. MVO is an earth-abundant semiconductor with a band gap of 1.7 eV that absorbs visible light to create reactive oxygen species (ROS) in water. ROS reduces bacteria counts by 4 orders of magnitude in 8 h under 9000 lux LED light. The antibacterial effect is significant even in MVO powder and films, which are amenable to large-area fabrication. MVO is a promising candidate for next-generation antimicrobial coatings that are stable, cheap, effective, earth-abundant, and activated by indoor lights.
抗菌表面可以减少高接触表面细菌的传播，从而拯救全球数百万人的生命。TiO 等抗菌光催化薄膜已被广泛报道，但在实际应用中受到限制，因为它们需要高强度的紫外光。而在室内灯光下低强度可见光下工作的光催化剂则更实用，但报道较少。在这里，我们证明了氧化锰钒（MVO）是一种在 3000 勒克斯左右发光二极管（LED）灯光下工作的抗菌光催化剂。MVO 是一种丰富的半导体，带隙为 1.7eV，它吸收可见光在水中产生活性氧物质（ROS）。在 9000 勒克斯的 LED 光下，ROS 在 8 小时内将细菌数量减少了 4 个数量级。即使在 MVO 粉末和薄膜中，抗菌效果也很显著，这两种材料都易于大面积制备。MVO 是一种很有前途的下一代抗菌涂料的候选材料，它稳定、廉价、有效、丰富，并且可以通过室内灯光激活。
