Wafer-scale, three-dimensional helical porous thin films deposited at a glancing angle
Department of Physics
Minimization of helices opens a door to impose novel functions derived from the dimensional shrinkage of optical, mechanical and electronic devices. Glancing angle deposition (GLAD) enables one to deposit three-dimensional helical porous thin films (HPTFs) composed of separated spiral micro/nano-columns. GLAD integrates a series of advantageous features, including one-step deposition, wafer-scale production with mono-handedness of spirals, flexible engineering of spiral materials and dimensions, and the adaption to various kinds of substrates. Herein, we briefly review the fabrication of HPTFs by GLAD, specific growth mechanisms, physical properties in structures, mechanics and chiral optics, and the emerging applications in green energy. A prospective outlook is presented to illuminate some promising developments in enantioselection, bio-dynamic analyses, wirelessly-controlled drug delivery and mass production.
silver nanospirals, chiroptical activity, circular dichroism, glancing-angle deposition, chiroplasmon
Source Publication Title
Royal Society of Chemistry
The authors acknowledge Mr Benson Leung (Physics, HKBU) for his technical assistance in TEM (funded by SEG_HKBU06) and Mr Edward Chan (Physics, HKBU) for his technical support in x-ray diffraction. This work was financially supported by HKBU8/CRF/11E (GLAD; FB), NSFC/21473149 (FB, JHD), SKLP_14-15_P004 (FB), FRG2/13-14/018 (FB), NSFC/11304260 (JN) and FRG2/ 13-14/081 (JHD, JN).
Link to Publisher's Edition
Huang, Z., & Bai, F. (2014). Wafer-scale, three-dimensional helical porous thin films deposited at a glancing angle. Nanoscale, 6 (16), 9401-9409. https://doi.org/10.1039/c4nr00249k