Surface-enhanced Raman scattering on gold nanowire array formed by mechanical deformation using anodic porous alumina molds

Kondo, Toshiaki; Kitagishi, Naoya; Yanagishita, Takashi; Masuda, Hideki

doi:10.7567/apex.8.062002

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…Porous alumina films, which are often also called anodic porous alumina (APA), porous anodic alumina (PAA), anodic aluminum oxide (AAO), and porous aluminum oxide (PAO), possess a unique hexagonally arranged nanostructure with nanoscale pores [1][2][3] and are widely employed for various interesting nanotechnologies, such as surface-enhanced Raman scattering devices, 4 nanocapacitor arrays, 5 nanorods, 4,[6][7][8] membrane filters, 9,10 and coaxial devices. 11 A porous alumina film is typically formed via electrochemical anodizing in several aqueous solutions containing a multivalent acidic electrolyte, such as oxalic ((COOH) 2 ), sulfuric (H 2 SO 4 ), and phosphoric (H 3 PO 4 ) acids.…”

mentioning

confidence: 99%

Initial Structural Changes of Porous Alumina Film via High-Resolution Microscopy Observations

Iwai¹,

Kikuchi²,

Suzuki³

2020

ECS J. Solid State Sci. Technol.

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The initial growth of a porous alumina film with a large-scale cell structure formed by galvanostatic anodizing in etidronic acid was investigated in detail by high-resolution microscopy. High-purity aluminum plates were galvanostatically anodized in etidronic acid at 2.5–20.0 Am−2. The formation of an anodic oxide and the subsequent instability of the outer oxide simultaneously occurred at the early stage of the linear voltage increase during the anodizing process. Accordingly, a wavy interface boundary between the aluminum oxide that contained incorporated anions and the nearly pure aluminum oxide formed in the anodic oxide. The surviving pores grew as the thickness of the oxide film increased, and a clear porous alumina film with a pore at the center of each cell formed until the voltage reached its maximum value. Finally, steady-state growth of the porous alumina film occurred at the plateau voltage region after a slight voltage decrease. Eggplant-like anion distributions were measured at the head of the pores due to the viscous flow of the anodic oxide. The nanomorphology of the porous alumina film strongly depended on the current density due to the difference in the degree of oxide formation and localized oxide dissolution.

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confidence: 99%

Initial Structural Changes of Porous Alumina Film via High-Resolution Microscopy Observations

Iwai¹,

Kikuchi²,

Suzuki³

2020

ECS J. Solid State Sci. Technol.

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“…Metals are typically deposited inside the nanoporous network of NAA from electrolytes, which serves as cathode during this process. Despite its limitations, such as low deposition rate and single use of host template, electrodeposition is an attractive approach to surface-modify NAA platforms and prepare nanostructures such as nanotubes or nanowires since it is cost-effective, simple, and it can be performed with simple laboratory equipment at room temperature [ 194 , 195 ]. Nanostructures based on different metals (i.e., copper [ 196 ], nickel [ 197 ], and antimony [ 198 ]) have been successfully synthesized in NAA platforms by electrodeposition, enabling the precise tailoring of the properties of these materials for specific applications such as sensing and catalysis [ 28 , 199 ].…”

Section: Surface Modification Of Nanoporous Anodic Alumina Photonimentioning

confidence: 99%

Nanoporous Anodic Alumina Photonic Crystals for Optical Chemo- and Biosensing: Fundamentals, Advances, and Perspectives

et al. 2018

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Optical sensors are a class of devices that enable the identification and/or quantification of analyte molecules across multiple fields and disciplines such as environmental protection, medical diagnosis, security, food technology, biotechnology, and animal welfare. Nanoporous photonic crystal (PC) structures provide excellent platforms to develop such systems for a plethora of applications since these engineered materials enable precise and versatile control of light–matter interactions at the nanoscale. Nanoporous PCs provide both high sensitivity to monitor in real-time molecular binding events and a nanoporous matrix for selective immobilization of molecules of interest over increased surface areas. Nanoporous anodic alumina (NAA), a nanomaterial long envisaged as a PC, is an outstanding platform material to develop optical sensing systems in combination with multiple photonic technologies. Nanoporous anodic alumina photonic crystals (NAA-PCs) provide a versatile nanoporous structure that can be engineered in a multidimensional fashion to create unique PC sensing platforms such as Fabry–Pérot interferometers, distributed Bragg reflectors, gradient-index filters, optical microcavities, and others. The effective medium of NAA-PCs undergoes changes upon interactions with analyte molecules. These changes modify the NAA-PCs’ spectral fingerprints, which can be readily quantified to develop different sensing systems. This review introduces the fundamental development of NAA-PCs, compiling the most significant advances in the use of these optical materials for chemo- and biosensing applications, with a final prospective outlook about this exciting and dynamic field.

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“…Porous alumina has a characteristic honeycomb nanostructure that consists of a porous layer with numerous high-aspect-ratio nanopores and a thin barrier layer. Therefore, porous alumina is widely used in various novel nano-science and engineering, such as storage devices [10], optoelectronic devices [11], metamaterials [12], photonic materials [13], surface plasmon resonances [14], gas sensors [15], biomaterials [16], and nanowires [17].…”

Section: Introductionmentioning

confidence: 99%

Nanostructural characterization of large-scale porous alumina fabricated via anodizing in arsenic acid solution

Akiya

Kikuchi

Natsui

2017

Applied Surface Science

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Anodizing of aluminum in an arsenic acid solution is reported for the fabrication of anodic porous alumina. The highest potential difference (voltage) without oxide burning increased as the temperature and the concentration of the arsenic acid solution decreased, and a high anodizing potential difference of 340 V was achieved. An ordered porous alumina with several tens of cells was formed in 0.1-0.5 M arsenic acid solutions at 310-340 V for 20 h. However, the regularity of the porous alumina was not improved via anodizing for 72 h. No pore sealing behavior of the porous alumina was observed upon immersion in boiling distilled water, and it may be due to the formation of an insoluble complex on the oxide surface. The porous alumina consisted of two different layers: a hexagonal alumina layer that contained arsenic from the electrolyte and a pure alumina honeycomb skeleton. The porous alumina exhibited a white photoluminescence emission at approximately 515 nm under UV irradiation at 254 nm.

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Surface-enhanced Raman scattering on gold nanowire array formed by mechanical deformation using anodic porous alumina molds

Cited by 10 publications

References 19 publications

Initial Structural Changes of Porous Alumina Film via High-Resolution Microscopy Observations

Initial Structural Changes of Porous Alumina Film via High-Resolution Microscopy Observations

Nanoporous Anodic Alumina Photonic Crystals for Optical Chemo- and Biosensing: Fundamentals, Advances, and Perspectives

Nanostructural characterization of large-scale porous alumina fabricated via anodizing in arsenic acid solution

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