Flexible superhydrophobic SERS substrates fabricated by in situ reduction of Ag on femtosecond laser-written hierarchical surfaces

George, Jijo Easo; Unnikrishnan, V. K.; Mathur, D.; Chidangil, Santhosh; George, Sajan D.

doi:10.1016/j.snb.2018.05.155

Cited by 70 publications

(36 citation statements)

References 56 publications

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“…The Raman signal intensity decreases with the concentration. Due to the advantages of the flexibility, flexible SERS substrates have been demonstrated for conformal rapid and non-invasive SERS detection [33,34,81]. Besides, we measured the sensing performance under repeated 100 cycling between different bending degrees, which shows stability without noticeable deterioration.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, there have been developed various SERS substrates with micro-/nano-structures for performance improvement [26][27][28][29][30][31]. Up to now, there are successful approaches (e.g., metal colloid self-assembly, soft lithography, uniaxial stretching) and materials (e.g., biocompatible poly(ε-caprolactone) film, PMMA) for the fabrication of flexible SERS substrates [32][33][34][35][36][37]. For example, Sharma et al proposed "nano-fingers" on silicon nanowire arrays as SERS substrate, in which the silicon nanowire arrays are fabricated by using deep-ultraviolet lithography [38].…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Fang

Zhang

et al. 2021

IEEE Photonics J.

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Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification. However, fabrication of flexible and structured SERS substrates for performance improvement in a facile and cost-effective manner is challenging. In this work, we reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology. The femtosecond laser-treated PTFE surface is 3D hierarchical micro-/nano-structures, and the structured PTFE-based SERS chip shows excellent performance enhancement. As a result, 10 −7 M can be detected, which shows excellent potentials in developing flexible SERS for wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Fang

Zhang

et al. 2021

IEEE Photonics J.

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“…Besides this work, several other works have been conducted to replicate superhydrophobic structures. Two examples are, Bekesi et al 2010 [ 31 ] using injection molding and George et al 2018 [ 32 ] employing soft lithography, resulted in a contact angle above 160° for PP and 156° for Polydimethylsiloxane (PDMS), respectively. These works yield contact angles comparable to what have been demonstrated in this manuscript, but do not demonstrate the repeatability or durability of their processes.…”

Section: Resultsmentioning

confidence: 99%

Robust mold fabricated by femtosecond laser pulses for continuous thermal imprinting of superhydrophobic surfaces

Zhan

Garcell

Chen

2019

Mater. Res. Express

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Superhydrophobic surfaces rely on a large number of surface micro/nano structures to increase the roughness of a material. Producing such structures is possible through a multitude of relatively slow methods; however, economic and large scale production of superhydrophobic surfaces require using a fast process on a cheap substrate. Here, we used femtosecond laser processing to fabricate micro and nanostructures on tungsten carbide that we use as a mold to thermally imprint polypropylene sheets. The fabricated tungsten carbide mold was used to imprint more than twenty superhydrophobic polypropylene sheets before mold contamination reduces the surface contact angle below 150°.Using Toluene solution, the mold is subsequently capable of being cleaned of contamination from polypropylene residue and reused for further imprinting. Ninety thermoplastic imprints were conducted using a single tungsten carbide mold with only minimal structural degradation apparent on the micro/nano structured surface.

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“…Low concentration analytes in aqueous samples can be preconcentrated and detected satisfactory. [114][115][116] It has been proved that SERS substrates prepared by superhydrophobic materials integrated with silver nanoclusters and pillars array can concentrate analyte solutions, selectively adsorb analytes (Figure 12), such that the concentration of superlow rhodamine molecules (10 −18 M) was detected. Moreover, the principle of concentration was explained by mathematical methods.…”

Section: Hydrophobic/superhydrophobic Sers Substratementioning

confidence: 99%

Surface‐enhanced Raman spectroscopy for on‐site analysis: A review of recent developments

Gong

Wang

et al. 2020

Luminescence

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On‐site identification and quantification of chemicals is critical for promoting food safety, human health, homeland security risk assessment, and disease diagnosis. Surface‐enhanced Raman spectroscopy (SERS) has been widely considered as a promising method for on‐site analysis due to the advantages of nondestructive, abundant molecular information, and outstanding sensitivity. However, SERS for on‐site application has been restricted not only by the cost, performance, and portability of portable Raman instruments, but also by the sampling ability and signal enhancing performance of the SERS substrates. In recent years, the performance of SERS for on‐site analysis has been improved through portable Raman instruments, SERS substrates, and other combined technologies. In this review, popular commercial portable Raman spectrometers and the related technologies for on‐site analysis are compared. In addition, different types of SERS substrates for on‐site application are summarized. SERS combined with other technologies, such as electrochemical and microfluidics are also presented. The future perspective of SERS for on‐site analysis is also discussed.

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Flexible superhydrophobic SERS substrates fabricated by in situ reduction of Ag on femtosecond laser-written hierarchical surfaces

Cited by 70 publications

References 56 publications

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Robust mold fabricated by femtosecond laser pulses for continuous thermal imprinting of superhydrophobic surfaces

Surface‐enhanced Raman spectroscopy for on‐site analysis: A review of recent developments

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