Surface modification of nanoporous alumina layers by deposition of Ag nanoparticles. Effect of alumina pore diameter on the morphology of silver deposit and its influence on SERS activity

Pisarek, Marcin; Nowakowski, Robert; Kudelski, Andrzej; Hołdyński, Marcin; Roguska, Agata; Janik‐Czachor, M.; Kurowska-Tabor, Elżbieta; Sulka, Grzegorz D.

doi:10.1016/j.apsusc.2015.10.011

Cited by 16 publications

(13 citation statements)

References 34 publications

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“…As shown in Figure , from Al‐0 to AP‐16 (Figures a–c) and from Al‐0 to Al‐45 (Figures a, d, and e), the structure of alumina platform becomes much looser. The loose structure can provide additional open surface pores for the penetration and resonance oscillation of light, which results in the enhancement of SERS signals. However, the pore size of the loose structure should well match with the size of plasmonic Ag NPs.…”

Section: Resultsmentioning

confidence: 99%

“…with rough surface, sharp edges, and particle‐particle nanogaps have been synthesized to produce more hot spots, which extremely enhances the Raman signal in SERS detection. Besides, 2D nanostructured materials deposited with noble metal NPs, such as anodic aluminum oxide layer, polymer thin films, filter paper, and porous silicon layer, are also prepared as SERS substrates. Furthermore, 3D porous structures embedded with Ag or Au NPs have also been exploited as efficient SERS substrate, such as porous polymers, porous silicon, porous alumina membranes and ceramics, and porous glass ceramics .…”

Section: Introductionmentioning

confidence: 99%

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Porous alumina aerogel with tunable pore structure for facile, ultrasensitive, and reproducible SERS platform

Zou

Wang

Yang

et al. 2019

J Raman Spectroscopy

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Porous alumina aerogel synthesized by sol–gel method was used as facile and sensitive surface‐enhanced Raman scattering (SERS) platform. In a simple “drop‐test” SERS detection, low concentration dye solution mixed with silver nanoparticles was directly dropped on the surface of aerogel platform for SERS detection immediately. The pore structure of alumina aerogel was tuned by adding PEG‐400 and varying the gelation temperature. The effects of surface morphology and pore size of alumina aerogel platform on SERS performance of crystal violet (CV) were investigated. The result shows that large specific surface area and interconnected pore network of aerogel are helpful for fast permeation of solution, generation of “hot spots,” and adsorption of probe molecules. The Raman signal of CV was largely enhanced, enabling a detection concentration to 5 × 10−10 M with a SERS enhancement factor of 3.4 × 107. The SERS enhancement of alumina aerogel platform is remarkably improved with the increase of specific surface area and pore size, which is also confirmed by the finite‐difference time‐domain simulation. Moreover, the relative standard deviation of SERS intensity at 1619 cm-1 band for 5 × 10−8 M CV on aerogel platform is about 12%, indicating a good reproducibility.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porous alumina aerogel with tunable pore structure for facile, ultrasensitive, and reproducible SERS platform

Zou

Wang

Yang

et al. 2019

J Raman Spectroscopy

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“…The SERS enhancement factor (E F ) for the pyridine (Py) probe molecule was successfully estimated using the following formula (1): The hundredfold increase in SERS enhancement shown in Figure 9b is apparently due to a combination of two factors: a change in the specific surface area of the nanotubes with formation voltage [15], and a change in the distribution and size of the Ag nanoparticles with nanotube size [23]. These geometrical factors affect the properties of the silver "nanoresonators" produced on the tops and side walls of the TiO 2 nanotubes.…”

Section: Resultsmentioning

confidence: 99%

“…More details are given elsewhere [18,23]. We strictly controlled in situ the average amount of metal deposited per cm 2 using a quartz microbalance.…”

Section: Fabrication Surface and Structure Characterization Of Sers mentioning

confidence: 99%

Titanium (IV) Oxide Nanotubes in Design of Active SERS Substrates for High Sensitivity Analytical Applications: Effect of Geometrical Factors in Nanotubes and in Ag-n Deposits

Pisarek¹,

Krajczewski²,

Hołdyński³

et al. 2018

Raman Spectroscopy

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In this chapter, we summarize the results of recent investigations into TiO 2 nanotubular oxide layers on Ti metal loaded with Ag nanoparticles, which act as efficient surface plasmon resonators. These Ag-n/TiO 2 NT/Ti composite layers appear to be useful as platforms for precise surface analytical investigations of minute amounts of numerous types of organic molecules: pyridine (Py), mercaptobenzoic acid (MBA), 5-(4-dimethylaminobenzylidene) rhodamine (DBRh) and rhodamine (R6G); such investigations are known as surface enhanced Raman Spectroscopy (SERS). Geometrical factors related to the nanotubes and the silver deposit affect the SERS activity of the resulting composite layers. The results presented here show that, for a carefully controlled amount of Ag-n deposit located mainly on the tops of titania nanotubes, it is possible to obtain high-quality, reproducible SERS spectra for probe molecules at an enhancement factor of 10 5 -10 6 . This achievement makes it possible to detect organic molecules at concentrations as low as, e.g., 10−9 M for R6G molecules. SEM investigations suggest that the size of the nanotubes, and both the lateral and perpendicular distribution of Ag-n (on the tube tops and walls), are responsible for the SERS activity. These features of the Ag-n/TiO 2 NT/Ti composite layer provide a variety of cavities and slits which function as suitable resonators for the adsorbed molecules.

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“…Due to its porous microstructure, the anodic hard coating produced on aluminium using electrochemical methods facilitates its use as a matrix for composite coatings. Composite coatings based on anodic hard coatings can be obtained using a number of methods, including electrochemical, CVD, PVD, and their variants [10][11][12]. Metals (Ni, Cu, Cr, Co) are used most often as modifiers of aluminium oxide coatings for tribological purposes [13,14], followed by low-friction polymers (PU, PTFE) [15,16] and solid lubricants (C, MoS 2 , WS2) [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Composite Coatings Obtained on Aluminium Alloys

Bara¹,

Kmita²,

Korzekwa³

2016

Archives of Metallurgy and Materials

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This paper presents methods of modifying the anode surface layers of Al2O3 by introducing carbon to their microstructure. Composite coatings were prepared using two different methods. In the first, coatings were formed by means of oxidation under constant current conditions. Anodic oxidation of aluminium was conducted in a multicomponent electrolyte with the addition of organic acids and graphite. The second method was based on the formation of oxide coatings in an electrolyte without the addition of graphite or heat treatment of the layers of succinic acid. The obtained coatings were tested using SEM, TEM, and GDOES (glow discharge optical emission spectrometry) and their tribological and stereometric properties were measured. The study demonstrated the beneficial effects of the methods when used to improve the tribological properties of sliding couples.

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Surface modification of nanoporous alumina layers by deposition of Ag nanoparticles. Effect of alumina pore diameter on the morphology of silver deposit and its influence on SERS activity

Cited by 16 publications

References 34 publications

Porous alumina aerogel with tunable pore structure for facile, ultrasensitive, and reproducible SERS platform

Porous alumina aerogel with tunable pore structure for facile, ultrasensitive, and reproducible SERS platform

Titanium (IV) Oxide Nanotubes in Design of Active SERS Substrates for High Sensitivity Analytical Applications: Effect of Geometrical Factors in Nanotubes and in Ag-n Deposits

Microstructure and Properties of Composite Coatings Obtained on Aluminium Alloys

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