Laser rapid thermal annealing enables tunable plasmonics in nanoporous gold nanoparticles

Arnob, Masud Parvez; Zhao, Fei; Zeng, Jin; Santos, Greggy M.; Li, Ming; Shih, Wei-Chuan

doi:10.1039/c4nr03672g

Cited by 62 publications

(46 citation statements)

References 38 publications

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“…[4][5][6][7][8][9][10][11][12][13] The intensity of a Raman signal bears a linear relationship to the analyte concentrations, therefore, Raman spectroscopy can be used as a quantitative tool in concentration measurements as well. 1,4,5,[14][15][16][17] An ultimate goal in this field is to develop Raman spectroscopy-based techniques for biomedical applications through instrumentation, [18][19][20][21][22] plasmonic substrates, [23][24][25][26][27] devices, 28,29 assays, 30,31 and techniques. 32,33 Raman spectroscopic measurements, like other optical techniques, pose minimal danger from exposure to ionizing radiation due to the low-energy optical radiation exposure.…”

Section: Introductionmentioning

confidence: 99%

Noninvasive glucose sensing by transcutaneous Raman spectroscopy

2015

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Abstract. We present the development of a transcutaneous Raman spectroscopy system and analysis algorithm for noninvasive glucose sensing. The instrument and algorithm were tested in a preclinical study in which a dog model was used. To achieve a robust glucose test system, the blood levels were clamped for periods of up to 45 min. Glucose clamping and rise/fall patterns have been achieved by injecting glucose and insulin into the ear veins of the dog. Venous blood samples were drawn every 5 min and a plasma glucose concentration was obtained and used to maintain the clamps, to build the calibration model, and to evaluate the performance of the system. We evaluated the utility of the simultaneously acquired Raman spectra to be used to determine the plasma glucose values during the 8-h experiment. We obtained prediction errors in the range of ∼1.5 − 2 mM. These were in-line with a best-case theoretical estimate considering the limitations of the signal-to-noise ratio estimates. As expected, the transition regions of the clamp study produced larger predictive errors than the stable regions. This is related to the divergence of the interstitial fluid (ISF) and plasma glucose values during those periods. Two key contributors to error beside the ISF/plasma difference were photobleaching and detector drift. The study demonstrated the potential of Raman spectroscopy in noninvasive applications and provides areas where the technology can be improved in future studies.

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Section: Introductionmentioning

confidence: 99%

Noninvasive glucose sensing by transcutaneous Raman spectroscopy

2015

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“…Rapid laser-assisted thermal annealing and post-dealloying enable higher performance in comparison to the above mentioned approaches, requiring, on the other hand, additional steps in the processing chain, and, more importantly, often cause undesirable decrease of pore density 34,35 . In this way, high-performing, easyto-implement, "dry" and "green" (without hazardous chemicals) technology for fabricating porous plasmonic nanostructures is still missing.…”

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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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“…The lithography step patterns gold-silver film into nanoparticles of well-defined shape and size, while the dealloying step produces highly porous nanostructures throughout each individual nanoparticles. Single NPG nanoparticle features large surface area, high-density plasmonic hot-spots, and tunable plasmonic resonance [16,17]. Due to the less metallic nature, single NPG nanoparticles feature LSPR resonance in the NIR wavelength range from ∼700 to 1800 nm depending on its diameter and pore size [15].…”

Section: Nanoporous Gold Nanoparticles and Arraysmentioning

confidence: 99%

3D Plasmonic Nanoarchitecture As an Emerging Biosensing Platform

Arnob

Shih

2017

Nanomedicine (Lond.)

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Propagating & localized surface plasmon resonanceRecent advances in plasmonics of coinage metals have attracted significant interest in the biosensing community [1,2]. Surface plasmon resonance refers to the oscillation of conduction band electrons excited by light. Often touted as a label-free sensing technique, surface plasmon resonance based sensing and imaging have become commercially available for quite some time, and are employed in applications such as studying protein-protein interactions, immunochemical procedures and drug-receptor binding. Traditional surface plasmon resonance sensors rely on the propagating surface plasmon resonance (PSPR), where light-electron coupling is obtained via total-internalreflection, a condition typically achieved by prism coupling [3][4][5]. Due to the unconventional nature of light coupling, PSPR sensors face challenges in instrument miniaturization and simplification. Another limiting factor for PSPR imaging is spatial resolution. Although, confined to the metal-dielectric interface, plasmon waves do propagate along the interface, therefore degrades spatial resolution.Localized surface plasmon resonance (LSPR) refers to nonpropagating plasmon modes identified in various nanostructures and colloidal nanoparticles [6]. In contrast to PSPR, LSPR provides the possibility of free-space light coupling and highly confined fields in all three dimensions, thanks to the nanostructures. These features can significantly reduce system complexity and measurement requirements [7]. In addition, since nanostructures are involved, the latitude of engineering design has substantially increased compared with PSPR where a thin film suffices. LSPR associated light concentration & field enhancementThe light concentrating property of LSPR is a focal point of modern plasmonic biosensing research. Typically understood as collective electron oscillation, LSPR produces highly localized electromagnetic field enhancement in plasmonic nanomaterials [6]. Plasmonic hot-spots refer to the locations, in close proximity of nanostructures, where electromagnetic fields are particularly enhanced relative to the incident field. LSPR associated local field concentration has been shown to enhance a variety of electronic as well as vibrational spectroscopic techniques. Among those, prominent examples can be drawn from Raman scattering, infrared and near-infrared (NIR) absorption and fluorescence [8][9][10][11].Traditional plasmonic nanomaterials are 1D (e.g., colloidal nanoparticles) or 2D (lithographically patterned nanostructure arrays) in nature, which typically result in sparse field concentration patterns. To improve efficiency and better utilization of hot-spots, the concept of 3D plasmonic nanoarchitecture, where abundant hot-spots are formed in a 3D volumetric fashion, have emerged [12]. Practically, there are several potential advantages of plasmonic sensing. First, many plasmonic sensing mechanisms can be implemented in a label-free fashion which requires no additional binding of fluorescent tag or radi...

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Laser rapid thermal annealing enables tunable plasmonics in nanoporous gold nanoparticles

Cited by 62 publications

References 38 publications

Noninvasive glucose sensing by transcutaneous Raman spectroscopy

Noninvasive glucose sensing by transcutaneous Raman spectroscopy

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

3D Plasmonic Nanoarchitecture As an Emerging Biosensing Platform

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