Large area uniform deposition of silver nanoparticles through bio-inspired polydopamine coating on silicon nanowire arrays for practical SERS applications

Akin, Merve; Yilmaz, Mehmet; Babur, Esra; Özdemir, Betül; Erdoğan, Hakan; Tamer, Uğur; Demirel, Gökhan

doi:10.1039/c4tb00616j

Cited by 86 publications

(62 citation statements)

References 42 publications

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“…A closer look at these fi lms via crosssectional SEM shows that platelet microstructures with thicknesses of 70-500 nm are stacked on top of each other to adopt a face-on orientation relative the substrate surface. In sharp contrast, when the deposition angle was changed from 10° to 90°, high density arrays of vertically aligned ribbon-like micro-/ nanostructures, which are highly favorable for SERS applications, [ 41,42 ] were observed (Figure 1 a,b). The heights of these edge-on features are 0.8-3.0 µm.…”

Section: Resultsmentioning

confidence: 88%

“…In the case of C8-BTBT fi lm fabricated at α = 90°, a 3D morphology results in the generation of hot spots with an extremely high electric fi eld enhancement as a result of the tip-focusing, cavity resonances and antenna effects. [ 41,42 ] This factor is the dominant contributor to the observed high SERS signal enhancement for this particular fi lm. On the other hand, for the C8-BTBT fi lms fabricated at α = 10°, island like gold formations, which are very effective to create hot spots as a result of stronger enhancement of the local electromagnetic fi eld by closely placed gold nanostructures, should be the main contributor to the observed electromagnetic enhancement.…”

Section: Resultsmentioning

confidence: 94%

“…All collected spectra are well defi ned and have acceptable signal-tonoise ratios, consistent with our earlier reports for MB. [ 41,42 ] For all cases, the most prominent peaks in the spectra of MB can be summarized as follows: ring stretch (ν(C C)) at ≈1620 cm −1 , symmetric and asymmetric C N stretches (ν sym (C N) and ν asym (C N)) at ≈1395 and ≈1433 cm −1 , respectively, and the C N C skeletal deformation mode (δ(C N C)) at ≈449 cm −1 . Interestingly, gold-coated C8-BTBT fi lms fabricated at α = 90° exhibit a remarkable increment of the SERS signal intensities relative to that of the smooth gold fi lm.…”

Section: Resultsmentioning

confidence: 99%

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Micro‐/Nanostructured Highly Crystalline Organic Semiconductor Films for Surface‐Enhanced Raman Spectroscopy Applications

Yilmaz

Özdemir

Erdoğan

et al. 2015

Adv Funct Materials

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The utilization of inorganic semiconductors for surface‐enhanced Raman spectroscopy (SERS) has attracted enormous interest. However, despite the technological relevance of organic semiconductors for enabling inexpensive, large‐area, and flexible devices via solution processing techniques, these π‐conjugated systems have never been investigated for SERS applications. Here for the first time, a simple and versatile approach is demonstrated for the fabrication of novel SERS platforms based on micro‐/nanostructured 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene (C8‐BTBT) thin films via an oblique‐angle vapor deposition. The morphology of C8‐BTBT thin films is manipulated by varying the deposition angle, thus achieving highly favorable 3D vertically aligned ribbon‐like micro‐/nanostructures for a 90° deposition angle. By combining C8‐BTBT semiconductor films with a nanoscopic thin Au layer, remarkable SERS responses are achieved in terms of enhancement (≈108), stability (>90 d), and reproducibility (RSD < 0.14), indicating the great promise of Au/C8‐BTBT films as SERS platforms. Our results demonstrate the first example of an organic semiconductor‐based SERS platform with excellent detection characteristics, indicating that π‐conjugated organic semiconductors have a great potential for SERS applications.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Micro‐/Nanostructured Highly Crystalline Organic Semiconductor Films for Surface‐Enhanced Raman Spectroscopy Applications

Yilmaz

Özdemir

Erdoğan

et al. 2015

Adv Funct Materials

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“…The 3D microstructure of the SERS substrate has a significant impact on the SERS signal. Studies have shown that the SERS signal can be enhanced by changing the 2D planar substrate into a 3D microstructure substrate, for example, silicon nanowire [5], and pyramid structure [6][7][8][9]. This microstructured SERS substrate has a large surface area, therefore increases the number of effective hot spots, and further enhances the sensitivity of the SERS signal [10].…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Micro/Nano Hierarchical SERS Sensor via Anisotropic Etching and Electrochemical Treatment for Malachite Green Detection

Huang

Chien

2019

Applied Sciences

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Featured Application: The SERS active substrates developed in this study have great potential in areas such as medicine, food safety, and biotechnology. Abstract:We propose a facile method to produce micro/nano hierarchical surface-enhanced Raman scattering (SERS) active substrates using simple steps and inexpensive costs. The proposed SERS substrate is a silicon pyramid array covered by a nanostructured gold film (AuNS @ SiPA). Through finite element method (FEM) simulation, we showed that many strong local electric field enhancements (hot spots) were formed between the nano-gap of gold nanostructures. In addition, the micron-scale pyramid structure not only increases the sensing surface area of the sensor, but also helps trap light. By combining these micro and nano structures, the proposed micro/nano hierarchical SERS sensor exhibited high sensitivity. Experimental results confirmed that the AuNS @ SiPA substrate has high sensitivity. The SERS signal enhancement factor obtained from the Rhodamine 6G (R6G) probe molecules was as high as 1 × 10 7 and the SERS substrates were found to be able to detect a very low concentration of 0.01 nM malachite green (MG) solution. Therefore, this study provides a novel and practical method for fabricating SERS substrates that can facilitate the use of SERS in medicine, food safety, and biotechnology.

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“…By taking advantage of the synergistic interactions between the dielectric and metal components, the near-field electromagnetic fields can be significantly enhanced, which therefore improve the SERS activity of silicon nanostructures. For example, it has been reported that silicon NWs functionalized with metal nanoparticles could serve as a highlyefficient SERS substrate for ultrasensitive chemical and biomolecules detection [16][17][18][19]. On the other hand, one can also construct SERS substrates with superhydrophobic surfaces to overcome the 'diffusion limit' of analytes in highly diluted aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic SERS substrates based on silicon hierarchical nanostructures

Chen

Wen

Zhou

et al. 2018

J. Opt.

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Silicon nanostructures have been cultivated as promising surface enhanced Raman scattering (SERS) substrates in terms of their low-loss optical resonance modes, facile functionalization, and compatibility with today's state-of-the-art CMOS techniques. However, unlike their plasmonic counterparts, the electromagnetic field enhancements induced by silicon nanostructures are relatively small, which restrict their SERS sensing limit to around 10 -7 M. To tackle this problem, we propose here a strategy for improving the SERS performance of silicon nanostructures by constructing silicon hierarchical nanostructures with a superhydrophobic surface. The hierarchical nanostructures are binary structures consisted of silicon nanowires (NWs) grown on micropyramids (MPs). After being modified with perfluorooctyltriethoxysilane (PFOT), the nanostructure surface shows a stable superhydrophobicity with a high contact angle of ∼160°. The substrate can allow for concentrating diluted analyte solutions into a specific area during the evaporation of the liquid droplet, whereby the analytes are aggregated into a small volume and can be easily detected by the silicon nanostructure SERS substrate. The analyte molecules (methylene blue: MB) enriched from an aqueous solution lower than 10 -8 M can be readily detected. Such a detection limit is ∼100-fold lower than the conventional SERS substrates made of silicon nanostructures. Additionally, the detection limit can be further improved by functionalizing gold nanoparticles onto silicon hierarchical nanostructures, whereby the superhydrophobic characteristics and plasmonic field enhancements can be combined synergistically to give a detection limit down to ∼10 -11 M. A gold nanoparticle-functionalized superhydrophobic substrate was employed to detect the spiked melamine in liquid milk. The results showed that the detection limit can be as low as 10 -5 M, highlighting the potential of the proposed superhydrophobic SERS substrate in practical food safety inspection applications.

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Large area uniform deposition of silver nanoparticles through bio-inspired polydopamine coating on silicon nanowire arrays for practical SERS applications

Abstract: Bio-inspired polydopamine coating has been demonstrated to control the size and density of silver nanoparticles on 3-D SiNW arrays for practical SERS applications.

Cited by 86 publications

References 42 publications

Micro‐/Nanostructured Highly Crystalline Organic Semiconductor Films for Surface‐Enhanced Raman Spectroscopy Applications

Micro‐/Nanostructured Highly Crystalline Organic Semiconductor Films for Surface‐Enhanced Raman Spectroscopy Applications

Facile Fabrication of Micro/Nano Hierarchical SERS Sensor via Anisotropic Etching and Electrochemical Treatment for Malachite Green Detection

Superhydrophobic SERS substrates based on silicon hierarchical nanostructures

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