Large arrays of ultra-high aspect ratio periodic silicon nanowires obtained via top–down route

Svavarsson, H. G.; Hallgrímsson, Birgir Hrafn; Niraula, Manoj; Lee, Kyu Jin; Magnusson, Robert

doi:10.1007/s00339-015-9589-y

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…In general, these approaches can be categorized as top-down and bottom-up techniques. Top-down techniques, such as electron beam (E-beam) lithography, focused-ion beam and photon lithography, nanoindentation, and metal-induced chemical etching, can fabricate well-controlled nanoscale patterns, and they are promising techniques for fabricating SERS-active substrates (Figure a). − These approaches have difficulty in fabricating sub-5 nm structures (the size of a typical SERS hotspot is approximately 2 nm); however, the main challenges of top-down nanotechnology lie in the high technique barrier involved, low fabrication speed, and extremely high production cost, limiting their practical applications.…”

Section: Challenges In Real-life Sers Applicationsmentioning

confidence: 99%

“…Highly ordered rigid SERS substrates fabricated by different methods: (a) top-down fabrication, (b) bottom-up assembly, and (c) template-assisted fabrication. Copyright with the permission from refs (Copyright 2014 American Chemical Society), (Copyright 2016 American Chemical Society), (Copyright 2012 American Chemical Society), (Copyright 1998 Elsevier), (Copyright 2016 Royal Society of Chemistry), (Copyright 2012 American Chemical Society), (Copyright 2016 Springer), (Copyright 2017 American Chemical Society), (Copyright 2015 American Chemical Society), (Copyright 2004 Royal Society of Chemistry), (Copyright 2016 American Chemical Society), (Copyright 2016 American Chemical Society), (Copyright 2013 Royal Society of Chemistry), (Copyright 2013 Wiley), (Copyright 2017 MDPI), (Copyright 2010 American Chemical Society), (Copyright 2015 American Chemical Society), (Copyright 2009 American Chemical Society), and (Copyright 2015 Wiley).…”

Section: Challenges In Real-life Sers Applicationsmentioning

confidence: 99%

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Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants

Shi

Liu

Ying

2017

J. Agric. Food Chem.

108

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Surface-enhanced Raman scattering (SERS) is capable of detecting a single molecule with high specificity and has become a promising technique for rapid chemical analysis of agricultural products and foods. With a deeper understanding of the SERS effect and advances in nanofabrication technology, SERS is now on the edge of going out of the laboratory and becoming a sophisticated analytical tool to fulfill various real-world tasks. This review focuses on the challenges that SERS has met in this progress, such as how to obtain a reliable SERS signal, improve the sensitivity and specificity in a complex sample matrix, develop simple and user-friendly practical sensing approach, reduce the running cost, etc. This review highlights the new thoughts on design and nanofabrication of SERS-active substrates for solving these challenges and introduces the recent advances of SERS applications in this area. We hope that our discussion will encourage more researches to address these challenges and eventually help to bring SERS technology out of the laboratory.

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Section: Challenges In Real-life Sers Applicationsmentioning

confidence: 99%

Section: Challenges In Real-life Sers Applicationsmentioning

confidence: 99%

Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants

Shi

Liu

Ying

2017

J. Agric. Food Chem.

108

View full text Add to dashboard Cite

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“…Several methods have been developed for the fabrication of SERS substrates that follow either the top-down or bottom-up strategies. The top-down approach uses micro- and nanofabrication techniques, such as electron-beam lithography (EBL), , atomic layer deposition (ALD), , laser interference lithography (LIL), and focused ion beam (FIB) milling; top-down substrates have been reported for the detection of cancer cells. , Bottom-up approaches rely on the chemical synthesis and self-assembly of nanoparticles for hot-spot formation, − which offers a simpler, less time-consuming, and more cost-effective solution for SERS substrate preparation . It is accepted that the top-down strategy is suitable for fabricating uniform and reproducible substrates, whereas bottom-up methods produce areas of intense but not uniform hot-spots.…”

Section: Sers Fundamentalsmentioning

confidence: 99%

Label-Free Sensing with Metal Nanostructure-Based Surface-Enhanced Raman Spectroscopy for Cancer Diagnosis

Constantinou

Hadjigeorgiou

Abalde‐Cela

et al. 2022

ACS Appl. Nano Mater.

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Surface-Enhanced Raman Spectroscopy (SERS) is a powerful analytical technique for the detection of small analytes with great potential for medical diagnostic applications. Its high sensitivity and excellent molecular specificity, which stems from the unique fingerprint of molecular species, have been applied toward the detection of different types of cancer. The noninvasive and rapid detection offered by SERS highlights its applicability for point-of-care (PoC) deployment for cancer diagnosis, screening, and staging, as well as for predicting tumor recurrence and treatment monitoring. This review provides an overview of the progress in label-free (direct) SERS-based chemical detection for cancer diagnosis with the main focus on the advances in the design and preparation of SERS substrates on the basis of metal nanoparticle structures formed via bottom-up strategies. It begins by introducing a synopsis of the working principles of SERS, including key chemometric approaches for spectroscopic data analysis. Then it introduces the advances of label-free sensing with SERS in cancer diagnosis using biofluids (blood, urine, saliva, sweat) and breath as the detection media. In the end, an outlook of the advances and challenges in cancer diagnosis via SERS is provided.

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“…Among these methods, MACE is the simplest and most versatile one. It relies on catalyzed etching with assistance of a perforated metal template film (typically gold or silver) [25] or randomly distributed metallic nanoparticles (typically gold or silver) [26,27] spread on the Si-wafer. To date, studies have been focused on uniaxial load and have neglected the SiNWs response under isostatic pressure, which creates a load uniformly distributed on the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Piezoresistance characterization of silicon nanowires in uniaxial and isostatic pressure variation

Fakhri¹,

Plugaru²,

Sultan³

et al. 2022

Preprint

Self Cite

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Silicon nanowires (SiNWs) are known to exhibit large piezoresistance (PZR) effect, making it suitable for various sensing applications. Here, we report the results of a PZR investigation on randomly distributed and interconnected vertical silicon nanowire arrays as a pressure sensor. The samples were produced from p-type (100) Si wafers using a silver catalysed top-down etching process. The piezoresistance response of these SiNW arrays was analysed by measuring their I-V characteristics under applied uniaxial as well as isostatic pressure. The interconnected SiNWs exhibit increased mechanical stability in comparison with separated or periodic nanowires. The repeatability of the fabrication process and statistical distribution of measurements were also tested on several samples from different batches. A sensing resolution down to roughly 1 mbar pressure was observed with uniaxial force application, and more than two orders of magnitude resistance variation was determined for isostatic pressure below atmospheric pressure.

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Large arrays of ultra-high aspect ratio periodic silicon nanowires obtained via top–down route

Cited by 12 publications

References 18 publications

Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants

Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants

Label-Free Sensing with Metal Nanostructure-Based Surface-Enhanced Raman Spectroscopy for Cancer Diagnosis

Piezoresistance characterization of silicon nanowires in uniaxial and isostatic pressure variation

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