Manipulation and Applications of Hotspots in Nanostructured Surfaces and Thin Films

Zhao, Xiaoyu; Wen, Jinsheng; Zhu, Aonan; Cheng, Mingyu; Zhu, Qi; Zhang, Xiaolong; Wang, Yaxin; Zhang, Yongjun

doi:10.3390/nano10091667

Cited by 15 publications

(11 citation statements)

References 69 publications

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“…The SERS signals of the Ag 10 nm/TiS 2 (t nm) nanostructures were the strongest when the thickness of TiS 2 was 2 nm. This was due to the SERS that majored from the LSPR of Ag and the "hot spots" of the adjacent nanocaps [32,33]. The Ag layer was below the TiS 2 layer, and the TiS 2 layer had a shielding effect on the LSPR of Ag, so the strength of Ag LSPR decreased exponentially with the thickness of the TiS 2 layer [34].…”

Section: Resultsmentioning

confidence: 99%

Thickness-Dependent NIR LSPR of Curved Ag/TiS2 Bilayer Film

Zhang

Wang

2020

Molecules

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We demonstrated that the localized surface plasmon resonance (LSPR) features of Ag/TiS2 nanostructures were dependent on the sublayer thickness. The Ag/TiS2 bilayer film was obtained by the self-assembly method and magnetron sputtering. The thickness was controlled by changing the sputtering time when the sputtering powers were the same. When the Ag thickness decreased from 50 nm to 5 nm, the LSPR was tuned from the visible region to the Near Infrared (NIR) region. When the TiS2 thickness decreased from 60 nm to 2 nm, the LSPR shifted from the IR to NIR region. Analysis showed the thickness changes of Ag and TiS2 resulted in the changed carrier density, which led to the thickness-dependent shift of the LSPR.

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Section: Resultsmentioning

confidence: 99%

Thickness-Dependent NIR LSPR of Curved Ag/TiS2 Bilayer Film

Zhang

Wang

2020

Molecules

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“…Thermal evaporation provides an effective route with ease of the process, high uniformity, remarkable periodicity, low-cost fabrication, automation, and the possibility for highthroughput production. This could be attributed to the advantages of thermal evaporation methods, including the electrical charge neutrality of created particles, low sample charging effect, and homogeneous Au coverage [52], [53]. In templating with a larger PS size, the Au nanodot with a quasitriangular shape is typically generated.…”

Section: Nsl Combined With Various Deposition Methods Of Metallic Filmmentioning

confidence: 99%

The Prospects of Colloidal Lithography Towards Low-Cost and Scalable Sensors

Purwidyantri

Prabowo

2022

IEEE Nanotechnology Mag.

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Nanosphere lithography (NSL), a colloidal-based nanopatterning technique, has demonstrated versatility for bottom-up and top-down nanofabrication approaches with a simple procedure that can be performed in a standard chemical laboratory. This technique offers versatility for large-area nanopatterning with a low-cost process. Nanopatterned arrays have shown outstanding features in enhancing sensor performance due to their ability to create effective nanoscale physical and chemical changes, high molecular entrapment with the roughened substrate, and means of downscaling toward scalable sensors manufacturing. All these prominent properties have made NSL a promising candidate for scalable biosensors production as its performance is also highly comparable with the pre-existing lithography techniques that mostly require high-cost infrastructure. This mini-review discusses in detail the advantages of colloidal lithography over other lithography techniques from the resolution and scalability of manufacturing. It is emphasized that the cost-competitive NSL technology may be applicable for a broad range of end-users, from high-profit margins, such as communication, technology, and health sectors, to the low-profit margins, such as in food industries. The combinational strategies in NSL are presented, including polystyrene nanotemplating of the substrate, feasible integration with metallic film deposition technologies, and potential application in various sensing platforms.

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“…For the case of analytes located upon/between/among the top of the nanorods such as what is shown on the same figure with the analyte distribution on the nanorods, the contribution of the substrate to the SERS signal enhancement differs with the location of the analytes. Signals are stronger in case A (i.e., for analytes that exhibit bigger sizes than the gaps) compared to those in case B (smaller analytes) – the edges on the top of the nanorods induce stronger electromagnetic fields, meanwhile, analytes that are deep into the gaps between the nanorods experience weaker enhancement due to the lack of these edges ( Bell et al, 2020 ; Lin et al, 2011 ; Zhao et al, 2020 ). Furthermore, a change in the orientation of an analyte molecule could also lead to a change in the SERS spectra since vibrational modes would then consequently change, which results to the appearance, disappearance, and/or shift in Raman peaks ( Rzeznicka and Horino, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Challenges of SERS technology as a non-nucleic acid or -antigen detection method for SARS-CoV-2 virus and its variants

Sitjar

Liao

Lee

et al. 2021

Biosensors and Bioelectronics

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The COVID-19 pandemic has caused a significant burden since December 2019 that has negatively impacted the global economy owing to the fact that the SARS-CoV-2 virus is fast-transmitting and highly contagious. Efforts have been taken to minimize the impact through strict screening measures in country borders in order to isolate potential virus carriers. Effective fast-screening methods are thus needed to identify infected individuals. The standard diagnostic methods for screening SARS-CoV-2 virus have always been to perform nucleic acid-based and serological tests. However, with each having drawbacks on producing false results at very early or later stage after symptoms onset, supplementary techniques are needed to back up these tests. Surface-enhanced Raman spectroscopy (SERS) as a detection technique has continuously advanced throughout the years in terms of sensitivity and capability to detect ultralow concentration of analytes ranging from single molecule to pathogens, to present as a highly potential alternative to known sensing methods. SERS technology as a candidate for an alternative and supplementary diagnostic method for the viral envelope of SARS-CoV-2 virus is presented, comparing its pros and cons to the standard methods and what other aspects it could offer that the other methods are not capable of. Factors that contribute to the detection effectivity of SERS is also discussed to show the advantages and limitations of this technique. Despite its promising capabilities, challenges like sources of SARS-CoV-2 virus and its variations, reliable SERS spectra, mass production of SERS-active substrates, and compliance to regulations for wide-scale testing scenario are highlighted.

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Manipulation and Applications of Hotspots in Nanostructured Surfaces and Thin Films

Cited by 15 publications

References 69 publications

Thickness-Dependent NIR LSPR of Curved Ag/TiS2 Bilayer Film

Thickness-Dependent NIR LSPR of Curved Ag/TiS2 Bilayer Film

The Prospects of Colloidal Lithography Towards Low-Cost and Scalable Sensors

Challenges of SERS technology as a non-nucleic acid or -antigen detection method for SARS-CoV-2 virus and its variants

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