Morphological and Structural Control of Organic Monolayer Colloidal Crystal Based on Plasma Etching and Its Application in Fabrication of Ordered Gold Nanostructured Arrays

Abstract

Abstract:The organic monolayer colloidal crystals, which are usually prepared by self-assembling, could be used as templates, due to their interstitial geometry, for the periodically arranged nanostructured arrays, which have important applications in many fields, such as photonic crystals, information storage, super-hydrophobicity, biological and chemical sensing. Obviously, the structures of the obtained arrays mainly depend on those of the templates. However, the self-assembled monolayer colloidal crystal is exclusive in structure and for its hexagonal close-packed colloidal arrangement, leading to the limitation of the monolayer colloidal crystal as the template for the nanostructured arrays. Therefore, structural diversity is important in order for colloidal crystals to be used as the templates for various nanostructured arrays. Recently, there have been some reports on the morphological and structural manipulation of the organic monolayer colloidal crystals. In this review article, we focus on the recent progress in morphological and structural manipulation of polystyrene monolayer colloidal crystals based on plasma etching, and its application in the fabrication of the ordered gold nanostructured arrays with different structures, mainly including close-packed monolayer colloidal crystal and its transferrable property; structural manipulation based on plasma etching; and fabrication of gold nanostructured arrays based on varied monolayer colloidal crystals as template.

Fabrication of Pt-Ag-Au heterogenous truncated hollow sub-microspheres for chemically self-propelled colloidal motors

“…The Pt-Ag-Au truncated hollow sub-microspheres were fabricated via a PS colloidal template etching/heating and layer-by-layer isotropic deposition strategy, as schematically shown in figure 1. First, a PS colloidal monolayer template was synthesized on a Si wafer (3 cm × 3 cm) via gas-water interface self-assembly (figures 1(a) and (b)), as previously reported [42][43][44]. The self-assembled monolayer was closely packed.…”

“…Plasma etching is a conventional fabrication method. Ar plasma can etch some organic materials [44]. At an appropriate power, Ar plasma bombardment can continuously etch off the molecules from the PS spheres' surfaces via breaking the C-C and C-H bonds and produce a nearly isotropic etching process, leading to a reduction in size of the PS spheres (figures 2(b) and 6(a)).…”

Templated gold nanocaps for surface-enhanced Raman scattering (SERS) sensors based on monolayer polystyrene colloidal arrays

“…The structured PSCP arrays were heated in an oven at 90 1C (below the glass transition temperature of the PS spheres) for 10 minutes to make them more closely aligned together 25 and more stuck to the substrate. Then, sputter deposition (10 mA for 70 seconds with an air pressure of 7.0 Pa) of gold was used to coat the surface of PSCP arrays which were then immersed in dichloromethane solution for 15 minutes to remove the PSCP arrays.…”

Silver nanoparticle-assembled micro-bowl arrays for sensitive SERS detection of pesticide residue

“…However, the small diameter of the Au-nanobowls and single-layer Ag nanoparticles resulted in a low enhancement factor (∼3.7×10 4 ) [20]. A large-area (e.g.,>10 cm 2 ) ordered close-packed polystyrene (PS) sphere monolayer can be fabricated using a simple and facile ethanol-assisted selfassembly approach [21][22][23]. Therefore, plasmonic nanostructure arrays with high uniformity and reproducibility could be fabricated by a close-packed PS sphere monolayer templated approach.…”