Mushtaq, FajerGuerrero, MiguelSakar, SelmanHoop, MarcusLindo, AndreSort, JordiChen, XiangzhongNelson, BradleyPellicer, EvaPane, Salvador2016-02-162016-02-162016-02-16201510.1039/C5TA05825Bhttps://infoscience.epfl.ch/handle/20.500.14299/123537In this work, we have developed 3D hybrid microstructures consisting of a short ferromagnetic CoNi segment for wireless magnetic control, coupled to a photocatalytic Bi2O3/BiOCl segment for water remediation under UV-visible light. These hybrid microstructures (pillars and helices) were fabricated using 3D photolithography and template-assisted electrodeposition, followed by in situ creation of a Bi2O3/BiOCl heterojunction after oxidation of Bi. This heterojunction is not only active under a wider solar spectrum but also ensures sufficient charge separation and hence low electron–hole recombination rate. As a result, these hybrid microstructures were able to degrade rhodamine B dye with a 90% efficiency in 6 hours. On application of magnetic fields we were able to precisely control the structures and collect them for reuse. Cytotoxicity tests were performed on our hybrid structures and a 95% cell viability was reported showing that our structures are biocompatible.text::journal::journal article::research article