Gap-tunable Ag-nanorod arrays on alumina nanotip arrays as effective SERS substrates

Sun, Kexi; Meng, Guowen; Huang, Qing; Zhao, Xianglong; Zhu, Congshan; Huang, Zhulin; Qian, Yuguo; Wang, Xiujuan; Hu, Xiaoye

doi:10.1039/c3tc30669k

Cited by 55 publications

(47 citation statements)

References 43 publications

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“…8), which is comparable with the best reported detection level [55][56][57][58] . It should be noted that the signal intensity obtained from the commercial SERS substrate at the same concentration was negligibly small.…”

Section: Resultssupporting

confidence: 77%

High-resolution nanotransfer printing applicable to diverse surfaces via interface-targeted adhesion switching

et al. 2014

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Nanotransfer printing technology offers outstanding simplicity and throughput in the fabrication of transistors, metamaterials, epidermal sensors and other emerging devices. Nevertheless, the development of a large-area sub-50 nm nanotransfer printing process has been hindered by fundamental reliability issues in the replication of high-resolution templates and in the release of generated nanostructures. Here we present a solvent-assisted nanotransfer printing technique based on high-fidelity replication of sub-20 nm patterns using a dual-functional bilayer polymer thin film. For uniform and fast release of nanostructures on diverse receiver surfaces, interface-specific adhesion control is realized by employing a polydimethylsiloxane gel pad as a solvent-emitting transfer medium, providing unusual printing capability even on biological surfaces such as human skin and fruit peels. Based on this principle, we also demonstrate reliable printing of high-density metallic nanostructures for non-destructive and rapid surface-enhanced Raman spectroscopy analyses and for hydrogen detection sensors with excellent responsiveness.

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Section: Resultssupporting

confidence: 77%

High-resolution nanotransfer printing applicable to diverse surfaces via interface-targeted adhesion switching

et al. 2014

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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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“…During Au sputtering, Au nanoparticles start to grow on the apexes between surrounding pores, and as the amount of deposited Au increased, a protruding conical structure appears (Fig. 2f) [21]. This phenomenon is present between pores and is related to the finite wall thickness [22].…”

Section: Resultsmentioning

confidence: 96%

Morphology Dependence on Surface-Enhanced Raman Scattering Using Gold Nanorod Arrays Consisting of Agglomerated Nanoparticles

et al. 2016

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Highly ordered arrays of vertically aligned Au nanorod arrays consisting of agglomerated nanoparticles are fabricated by porous anodic aluminum oxide (AAO) template-assisted electrochemical deposition. The Au nanorod arrays with rough surfaces are then transformed to smooth surfaces by a subsequent thermal annealing step. The surface-enhanced Raman scattering (SERS) intensity of the Au nanorod arrays with rough and smooth surfaces was compared to investigate the morphology dependence of SERS. The Au nanorod arrays with agglomerated structures demonstrated a highly active SERS effect as abundant nanogaps are created uniformly by combination of hot spots caused by both agglomerated porous structures on each nanorod and inter-rod gaps

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Gap-tunable Ag-nanorod arrays on alumina nanotip arrays as effective SERS substrates

Cited by 55 publications

References 43 publications

High-resolution nanotransfer printing applicable to diverse surfaces via interface-targeted adhesion switching

High-resolution nanotransfer printing applicable to diverse surfaces via interface-targeted adhesion switching

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

Morphology Dependence on Surface-Enhanced Raman Scattering Using Gold Nanorod Arrays Consisting of Agglomerated Nanoparticles

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