Key Parameter Controlling the Sensitivity of Plasmonic Metal Nanoparticles: Aspect Ratio

Khan, Assad U.; Zhao, Shuqi; Liu, Guoliang

doi:10.1021/acs.jpcc.6b06519

Cited by 63 publications

(78 citation statements)

References 68 publications

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“…Based on the diameter and thickness measurements, the aspect ratio of the nanoplates ranged from 4.5 to 50. The upper bound of our aspect ratio is among the highest values of all reported methods that use citrate as a capping agent . For example, the aspect ratio of Ag nanoprisms by Charles et al ranged from 2.1 to 13.3.…”

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confidence: 72%

“…Plasmonic nanoparticles are important building‐block nanomaterials that have vast potential in applications including sensing, imaging, catalysis, photovoltaics, memory storage, and microelectronics . Particularly, plasmonic nanoparticles with plasmon resonance in the near‐infrared (NIR) range have been used in cell imaging, photothermal therapy, and optical communication because of their excellent capability of penetrating tissues and other barriers.…”

mentioning

confidence: 99%

“…The upper bound of our aspect ratio is among the highest values of all reported methods that use citrate as a capping agent. [1,23,37] For example, the aspect ratio of Ag nanoprisms by Charles et al ranged from 2.1 to 13.3. The synthesis protocol is highly reliable given good-quality Ag spherical and nanoplate seeds.…”

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confidence: 99%

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Poly(vinylpyrrolidone)‐Free Multistep Synthesis of Silver Nanoplates with Plasmon Resonance in the Near Infrared Range

Khan

Zhou

Krause

et al. 2017

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Herein, a poly(vinylpyrrolidone) (PVP)-free method is described for synthesizing Ag nanoplates that have localized surface plasmon resonance in the near-infrared (NIR) range. Citrate-capped Ag spherical nanoparticles are first grown into small Ag nanoplates that resonate in the range of 500-800 nm. The small Ag nanoplates are used as seeds to further grow into large Ag nanoplates with a lateral dimension of 100-600 nm and a plasmon resonance wavelength of 800-1660 nm and above. The number of growth steps can be increased as desired. Without introducing additional citrate into the solutions of small Ag nanoplate seeds, large Ag nanoplates can be synthesized within minutes. The entire synthesis is completely PVP free, which promotes the nanoparticle growth along the lateral direction to form large Ag nanoplates. The multistep growth and the minimum usage of citrate are essential for the fast growth of high-aspect-ratio Ag nanoplates resonating in the NIR range.

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confidence: 72%

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confidence: 99%

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Poly(vinylpyrrolidone)‐Free Multistep Synthesis of Silver Nanoplates with Plasmon Resonance in the Near Infrared Range

Khan

Zhou

Krause

et al. 2017

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“…This slight difference can be attributed to the different surrounding mediums since numerical calculations were performed with the assumption of water surrounding the NPs. A similar comparison for Ag nanoprisms has been plotted in Figure B, the wavelength of LSPR as experimentally measured and the numerical model . The comparison reveals the numerical model can predict in a reasonable accuracy the occurrence of LSPR.…”

Section: Resultsmentioning

confidence: 99%

“…Verification of the numerical model: A, LSPR wavelength of Ag nanospheres and B, LSPR wavelength of Ag nanoprism . LSPR, localized surface plasmon resonance [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

An innovative, high‐efficiency silver/silica nanocomposites for direct absorption concentrating solar thermal power

et al. 2020

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Summary Using of nanofluids in the concentrating direct absorption solar collectors has the potential of reducing thermal losses because of the excessive temperature of the absorbing surface in the conventional solar collectors. However, increasing the concentration ratio of solar radiation must be followed by increasing the volume fraction of the nanoparticles, which, in turn, has the drawbacks of increasing the settlement and agglomeration rates of the nanoparticles. In this study, we have suggested using the plasmonic nanofluids for volumetric absorption in the concentrated solar power applications because of the less volume fraction of the plasmonic nanoparticles that are required to harvest the concentrated solar radiation. The interaction of concentrated solar radiation with different morphologies of silver nanoparticles coated by silica shell has been computationally studied. Then, the finite element method has been implemented to determine the photo‐thermal conversion efficiency for silver nanosphere and nanoplates with a silica shell. Silver nanoparticles coated by silica exhibit a promising potential because of their distinct characteristics. The silica shell is transparent to the visible and near‐infrared radiation bands; it also consolidates the intensity of the localized plasmon resonance and so the absorption characteristics, besides its protective role. A high‐efficiency low concentration nanofluid has been designed using blended morphologies of Ag nanospheres and nanoprisms with silica‐coating–based nanofluid for full‐spectrum absorption characteristics. The suggested nanofluid exhibits a promising performance at a volume fraction of 0.0075 wt% where the volumetric solar collector efficiency exceeds 75% under the solar concentration ratio of 50.

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Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

Kim

Lee

et al. 2021

Advanced Materials

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sharp-tip structures with a highly focused field at the end of the tip. [7] In particular, plasmonic gap nanostructures (PGNs) are among the most promising materials for diverse applications with highly localized field and amplified optical signals in the gap including sensing, spectroscopy, optics, biomedicine, electronics, and energy applications. [8][9][10][11][12][13] The development of bottom-up or top-down synthetic methods enabled the access to numerous nanogap structures with diverse gap sizes, morphologies, and compositions. [14][15][16][17][18] The highly localized electric field inside the plasmonic nanogap and the appearance of plasmonic coupling in closely neighboring structures have been studied, leading to the discovery of interesting optical phenomena and advances in sensing such as ultrasensitive spectroscopy, singlemolecule sensing methods, and in situ detection techniques. [19][20][21] As small changes in the distance, morphology, and composition of the nanogap lead to significant variations in the optical responses, the highly precise, controllable, and high-yielding preparation of PGNs is important to achieve reproducible and reliable results. However, although numerous pioneering studies on basic synthetic methods, characteristics, and applications enabled the understanding and control over plasmonic nanogaps, key challenges still remain for the practical use and applications of PGNs. In particular, the sub-nanometer, atomic-level control of the nanogap, coupled with the scaling-up issue, and its fundamental understanding have not yet been fully accomplished. For example, in surfaceenhanced Raman spectroscopy (SERS) using plasmonic gaps, early research focused on a high enhancement factor (EF). In contrast, recent studies revealed that a deep understanding at atomic scale is required, as differences in the small regime such as picocavities or molecular orientation can have a large effect on the signal. [22][23][24] Hence, a comprehensive understanding of the nanogap is critical to the further development of the field.This progress report addresses emerging issues and challenges in the field of nanogap-based plasmonics and plasmonic nanomaterials. We first describe the challenges in the creation of intra-or intergaps by bottom-up or top-down synthesis, and discuss breakthroughs that allow for overcoming these obstacles. Next, optical properties according to gap size, morphology, and composition are summarized to provide insight into the nature of gap plasmonics. The discussion of applications in this article mainly highlights surface-enhanced Plasmonic gap nanostructures (PGNs) have been extensively investigated mainly because of their strongly enhanced optical responses, which stem from the high intensity of the localized field in the nanogap. The recently developed methods for the preparation of versatile nanogap structures open new avenues for the exploration of unprecedented optical properties and development of sensing applications relying on the amplification of various optical signals....

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Key Parameter Controlling the Sensitivity of Plasmonic Metal Nanoparticles: Aspect Ratio

Cited by 63 publications

References 68 publications

Poly(vinylpyrrolidone)‐Free Multistep Synthesis of Silver Nanoplates with Plasmon Resonance in the Near Infrared Range

Poly(vinylpyrrolidone)‐Free Multistep Synthesis of Silver Nanoplates with Plasmon Resonance in the Near Infrared Range

An innovative, high‐efficiency silver/silica nanocomposites for direct absorption concentrating solar thermal power

Synthesis, Assembly, Optical Properties, and Sensing Applications of Plasmonic Gap Nanostructures

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