A versatile ultra-thin Au nanomesh from a reusable anodic aluminium oxide (AAO) membrane

Abstract

In this work, Au nanomesh was fabricated by dint of sacrificial wet-etching of Ag layer of Au/Ag/AAO. Scheme S1 describes the detail for preparation of Au nanomesh. Au/Ag-coated AAO membrane was floated on the surface of HNO 3 solution (60%) to selectively etch away Ag layer from Au/Ag/AAO membrane. Within 10 min, Au layer separated from AAO replication master was floating on the surface of HNO 3 solution. Afterward, weakly bound metal nanoparticles (NPs) at the edges of holes of Au nanomesh were removed by floating the resulting Au mesh on the surface of diluted aqua regia. Finally, Au mesh was transferred onto a substrate after replacing aqua regia with de-ionized (DI) water in order to rinse Au mesh.Scheme S1 Schematic diagram for transfer of Au mesh on a substrate by (i) selectively dissolving Ag sacrificial layer of Au/Ag-coated AAO by HNO 3 and (ii) extirpating undesired metal nanoparticles (NPs) from the bottom side of the mesh after replacing HNO 3 with aqua regia, followed by (iii) transfer of Au nanomesh after DI water rinsing.

Realization of high-quality optical nanoporous gradient-index filters by optimal combination of anodization conditions

“…moderate electrolyte temperature and anodizing voltage/current density). [2][3][4] This milestone discovery boosted intensive research activity in NAA technology, spreading the applicability of this unique nanomaterial across multiple disciplines such as nanofabrication 5, 6 , separation and filtration 7,8 , electromagnetism 9,10 , chemo-and biosensing 11,12 , photonics 13,14 and electronics 15, 16 . Since then, numerous studies explored various anodization strategies and conditions to tailorengineer the nanoporous structure of NAA for specific applications.…”

Comprehensive Study of Au Nano-Mesh as a Catalyst in the Fabrication of Silicon Nanowires Arrays by Metal-Assisted Chemical Etching

“…In this approach, the ordered ultra-thin Au nano-meshes arrays were fabricated by self-ordered hexagonal porous AAO membrane. The Au films can be used not only as a catalyst in the metal-assisted chemical etching, but also as a lithographic film for the pattern of the substrate [24].…”

Large-area freestanding gold nanomembranes with nanoholes

“…However, challenges arise from fabricating large-area metal NMs with both freestanding modality and nanohole arrays at the same time. Previous efforts have realized such combination with advanced fabrication methods for nanohole generation, [20][21][22][23] followed by separation of NMs from substrates. However, the released NMs have either small lateral size (typically in mm ranges), random hole arrangement or have been finally transferred to substrates without further freestanding investigation.…”