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      Hot Spot Engineering in Hierarchical Plasmonic Nanostructures

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          Abstract

          The controllable nanogap structures offer an effective way to obtain strong and tunable localized surface plasmon resonance (LSPR). A novel hierarchical plasmonic nanostructure (HPN) is created by incorporating a rotating coordinate system into colloidal lithography. In this nanostructure, the hot spot density is increased drastically by the long‐range ordered morphology with discrete metal islands filled in the structural units. Based on the Volmer–Weber growth theory, the precise HPN growth model is established, which guides the hot spot engineering for improved LSPR tunability and strong field enhancement. The hot spot engineering strategy is examined by the application of HPNs as the surface‐enhanced Raman spectroscopy (SERS) substrate. It is universally suitable for various SERS characterization excited at different wavelengths. Based on the HPN and hot spot engineering strategy, single‐molecule level detection and long‐range mapping can be realized simultaneously. In that sense, it offers a great platform and guides the future design for various LSPR applications like surface‐enhanced spectra, biosensing, and photocatalysis.

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          Localized surface plasmon resonance sensors.

          Kathryn Mayer, Jason Hafner (2011)
          Article 0 comments Cited 703 times – based on 0 reviews     Review now
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            Dual-Functional Plasmonic Photothermal Biosensors for Highly Accurate Severe Acute Respiratory Syndrome Coronavirus 2 Detection

            Guangyu Qiu, Zhibo Gai, Yile Tao … (2020)
            The ongoing outbreak of the novel coronavirus disease (COVID-19) has spread globally and poses a threat to public health in more than 200 countries. Reliable laboratory diagnosis of the disease has been one of the foremost priorities for promoting public health interventions. The routinely used reverse transcription polymerase chain reaction (RT-PCR) is currently the reference method for COVID-19 diagnosis. However, it also reported a number of false-positive or -negative cases, especially in the early stages of the novel virus outbreak. In this work, a dual-functional plasmonic biosensor combining the plasmonic photothermal (PPT) effect and localized surface plasmon resonance (LSPR) sensing transduction provides an alternative and promising solution for the clinical COVID-19 diagnosis. The two-dimensional gold nanoislands (AuNIs) functionalized with complementary DNA receptors can perform a sensitive detection of the selected sequences from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) through nucleic acid hybridization. For better sensing performance, the thermoplasmonic heat is generated on the same AuNIs chip when illuminated at their plasmonic resonance frequency. The localized PPT heat is capable to elevate the in situ hybridization temperature and facilitate the accurate discrimination of two similar gene sequences. Our dual-functional LSPR biosensor exhibits a high sensitivity toward the selected SARS-CoV-2 sequences with a lower detection limit down to the concentration of 0.22 pM and allows precise detection of the specific target in a multigene mixture. This study gains insight into the thermoplasmonic enhancement and its applicability in the nucleic acid tests and viral disease diagnosis.
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              Localized surface plasmon resonance spectroscopy and sensing.

              Katherine A Willets, Richard Van Duyne (2007)
              Localized surface plasmon resonance (LSPR) spectroscopy of metallic nanoparticles is a powerful technique for chemical and biological sensing experiments. Moreover, the LSPR is responsible for the electromagnetic-field enhancement that leads to surface-enhanced Raman scattering (SERS) and other surface-enhanced spectroscopic processes. This review describes recent fundamental spectroscopic studies that reveal key relationships governing the LSPR spectral location and its sensitivity to the local environment, including nanoparticle shape and size. We also describe studies on the distance dependence of the enhanced electromagnetic field and the relationship between the plasmon resonance and the Raman excitation energy. Lastly, we introduce a new form of LSPR spectroscopy, involving the coupling between nanoparticle plasmon resonances and adsorbate molecular resonances. The results from these fundamental studies guide the design of new sensing experiments, illustrated through applications in which researchers use both LSPR wavelength-shift sensing and SERS to detect molecules of chemical and biological relevance.
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                Author and article information

                Contributors
                Journal
                Title: Small
                Abbreviated Title: Small
                Publisher: Wiley
                ISSN (Print): 1613-6810
                ISSN (Electronic): 1613-6829
                Publication date Created: June 2023
                Publication date (Electronic): March 11 2023
                Publication date (Print): June 2023
                Volume: 19
                Issue: 22
                Affiliations
                [1 ] School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 P. R. China
                [2 ] Department of Urology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 P. R. China
                Article
                DOI: 10.1002/smll.202205659
                SO-VID: 12ef8eba-242b-4fa1-b52d-9d297e71abe4
                Copyright © © 2023
                License:

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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