Porous Gold Films—A Short Review on Recent Progress

Zhang, Renyun; Olin, Håkan

doi:10.3390/ma7053834

Cited by 66 publications

(59 citation statements)

References 114 publications

(268 reference statements)

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“…In nanostructured metal surfaces the analyte interacts with the metallic nanostructure or nanoparticles clusters at the surface, where SERS ‗hot spots' are formed. Very recently, examples of nanostructured SERS substrates capable to sense living cells have been presented, including nanoantennas [27] and black silicon [28]; nanoporous material, and in particular gold, [29][30][31] are also arising as novel SERS active substrates, but so far their applications for living cell sensing on large area active substrates are missing.…”

Section: Introductionmentioning

confidence: 99%

Thin nanoporous alumina-based SERS platform for single cell sensing

Toccafondi

Rocca

Scarpellini

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Thin nanoporous alumina-based SERS platform for single cell sensing

Toccafondi

Rocca

Scarpellini

et al. 2015

Applied Surface Science

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“…were fabricated and tested as versatile SERS substrates [12][13][14][15][16][17][18][19][20][21][22][23] . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] .…”

mentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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“…According to the literature, AuPt hybrid nanostructures have become more attractive thanks to the synergistic catalytic effect and an excellent resistance to poisoning [34][35][36][37][38][39]. Different strategies to realize AuPt hybrid structures are reported in literature such as the dealloying method that involves multiple steps [40,41].…”

Section: Introductionmentioning

confidence: 99%

A bimetallic nanocoral Au decorated with Pt nanoflowers (bio)sensor for H2O2 detection at low potential

Sanzò

Taurino

Puppo

et al. 2017

Methods

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a b s t r a c tIn this work, we have developed for the first time a method to make novel gold and platinum hybrid bimetallic nanostructures differing in shape and size. Au-Pt nanostructures were prepared by electrodeposition in two simple steps. The first step consists of the electrodeposition of nanocoral Au onto a gold substrate using hydrogen as a dynamic template in an ammonium chloride solution. After that, the Pt nanostructures were deposited onto the nanocoral Au organized in pores. Using Pt (II) and Pt (IV), we realized nanocoral Au decorated with Pt nanospheres and nanocoral Au decorated with Pt nanoflowers, respectively. The bimetallic nanostructures showed better capability to electrochemically oxidize hydrogen peroxide compared with nanocoral Au. Moreover, Au-Pt nanostructures were able to lower the potential of detection and a higher performance was obtained at a low applied potential. Then, glucose oxidase was immobilized onto the bimetallic Au-Pt nanostructure using cross-linking with glutaraldehyde. The biosensor was characterized by chronoamperometry at +0.15 V vs. Ag pseudo-reference electrode (PRE) and showed good analytical performances with a linear range from 0.01 to 2.00 mM and a sensitivity of 33.66 mA/mM cm 2 . The good value of K m app (2.28 mM) demonstrates that the hybrid nanostructure is a favorable environment for the enzyme. Moreover, the low working potential can minimize the interference from ascorbic acid and uric acid as well as reducing power consumption to effect sensing. The simple procedure to realize this nanostructure and to immobilize enzymes, as well as the analytical performances of the resulting devices, encourage the use of this technology for the development of biosensors for clinical analysis.

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Porous Gold Films—A Short Review on Recent Progress

Cited by 66 publications

References 114 publications

Thin nanoporous alumina-based SERS platform for single cell sensing

Thin nanoporous alumina-based SERS platform for single cell sensing

Fabrication of porous microrings via laser printing and ion-beam post-etching

A bimetallic nanocoral Au decorated with Pt nanoflowers (bio)sensor for H2O2 detection at low potential

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