Abstract
Two-dimensional (2D) ZnO inverse opal (IO) films were fabricated by co-assembly of sacrificed polystyrene (PS) microspheres and citric acid/zinc acetate (CA/ZA) aqueous solution at an oil–water interface followed by calcination. Their morphologies could be controlled by the surface property of polymer templates and CA/ZA molar ratio. Moreover, photo-detecting devices based on such films were constructed, which showed high photocurrent (up to 4.6 μA), excellent spectral selectivity, and reversible response to optical switch.
Highlights
Two-dimensional (2D) inverse opals (IOs) with periodical porous structures always have large surface area and unique optical properties [1]
Fabrication of 2D IOs often requires multiple steps: (1) formation of a monolayer colloidal crystal (MCC) template film; (2) infiltration of precursors or matrix materials into the voids of the template film; (3) removal of the colloidal templates by dissolution or calcination
We further extend the oil–water interfacial assembly method to fabricate a PS/citric acid (CA)-zinc acetate (ZA) precursor monolayer film, and crack-free 2D ZnO IO films were obtained after calcination of the PS/precursor film
Summary
Two-dimensional (2D) inverse opals (IOs) with periodical porous structures always have large surface area and unique optical properties [1] They have demonstrated great potential in a variety of application fields, such as sensors, light-emitting diodes (LEDs), electrochromic devices, and surface-enhanced Raman spectroscopy (SERS) [2,3,4,5]. Oil–water interfacial assembly has been proven to be an effective way of obtaining high-quality floating MCC templates [21]. We fabricated Nix Mg1-x O nanobowl array photo-detecting devices via the oil–water interfacial assembly of polystyrene (PS) colloids and metal oxide precursors, followed by calcination [22]. We further extend the oil–water interfacial assembly method to fabricate a PS/citric acid (CA)-zinc acetate (ZA) precursor monolayer film, and crack-free 2D ZnO IO films were obtained after calcination of the PS/precursor film.
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