Low-adhesive superhydrophobic surface-enhanced Raman spectroscopy substrate fabricated by femtosecond laser ablation for ultratrace molecular detection

Wang, Andong; Jiang, Lan; Li, Xiaowei; Xie, Qian; Li, Bohong; Wang, Zhi; Du, Kun; Lu, Yongfeng

doi:10.1039/c6tb02629j

Cited by 69 publications

(38 citation statements)

References 27 publications

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“…The formation of laser‐induced periodic surface structures (LIPSS), which is first observed by Birnbaum in 1965, provides a mask‐free, nonvacuum, and low‐cost processing procedure for fabricating periodic structures on sample surfaces and exhibits powerful potential in various applications . After decades of research, multiple works have focused on LIPSS formation on a diverse range of materials . Nevertheless, this technology has always faced severe challenges, namely efficiency and quality control …”

Section: Introductionmentioning

confidence: 99%

Cylindrically Focused Nonablative Femtosecond Laser Processing of Long‐Range Uniform Periodic Surface Structures with Tunable Diffraction Efficiency

Huang

Jiang

et al. 2019

Advanced Optical Materials

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Periodic surface structures are core components for controlling the dispersion and steering characteristics of light. Here, a mask‐free approach using nonablative femtosecond laser processing is proposed and demonstrated to fabricate extremely long‐range uniform periodic surface structures on silicon with tunable diffraction efficiency. First, a cylindrically focused femtosecond laser scans over silicon substrates to efficiently produce large‐area periodic modified stripes in a nonablation regime. Second, the modified stripes act as fine etch stops to generate the desired structures on sample surfaces during the subsequent chemical etching process. The structures produced by the method achieve optimal long‐range uniformity compared to the reported laser‐induced periodic surface structures, which possess a minimum divergence of structure orientation angles of <5°. In addition, the optical characteristics of the prepared structures are measured experimentally. Distinguishable polychromatic diffraction patterns can be clearly observed by broadband light irradiation. Significantly, the chemical etching process endues the structures with ingenious morphology controllability, so that the diffraction efficiency of the incident light can be flexibly tuned, which exhibits a near‐linear function of the etching duration. Such morphology‐controllable periodic surface structures may facilitate applications in broad fields, such as optical communications and optical sensors.

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Section: Introductionmentioning

confidence: 99%

Cylindrically Focused Nonablative Femtosecond Laser Processing of Long‐Range Uniform Periodic Surface Structures with Tunable Diffraction Efficiency

Huang

Jiang

et al. 2019

Advanced Optical Materials

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“…Mostly, the laser fabricated NSs made of silver (Ag) and gold (Au) targets and are frequently tested as SERS platforms because of its intriguing plasmonic properties in the visible range . Other materials such as transition metals, semiconductors, and magnetic materials are also examined as SERS substrates after deposition of Ag or Au film/NPs (up to few nm) . Wang et al fabricated nanoripples and microcones structures on the silicon (Si) substrate using femtosecond (fs) laser ablation and used them as SERS substrates after the Ag film deposition .…”

Section: Introductionmentioning

confidence: 99%

“…Other materials such as transition metals, semiconductors, and magnetic materials are also examined as SERS substrates after deposition of Ag or Au film/NPs (up to few nm) . Wang et al fabricated nanoripples and microcones structures on the silicon (Si) substrate using femtosecond (fs) laser ablation and used them as SERS substrates after the Ag film deposition . Yang et al demonstrated the 4‐methyl benzenethiol detection using Si microsquare arrays fabricated by nanosecond laser ablation .…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman scattering studies of gold‐coated ripple‐like nanostructures on iron substrate achieved by femtosecond laser irradiation in water

Byram

Moram

Soma

2019

J Raman Spectroscopy

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During the past several years, numerous efforts have been accomplished on designing efficient surface‐enhanced Raman scattering (SERS) substrates with high sensitivity, good reproducibility, and recyclable nature. However, it still remains a significant challenge to realize all these qualities in a single substrate. We have fabricated ripple‐like nanostructures (NSs) on Iron (Fe) substrate using femtosecond (fs) laser irradiation of Fe target in distilled water. These ripple‐like structures had periodicities in the range of ~90–190 nm, which was confirmed from the analysis of field emission scanning electron microscope (FESEM) data. We subsequently deposited a thin layer of gold on these ripple‐like Fe NSs using thermal evaporation. Later, these coated NSs were effectively utilized as SERS substrates for methylene blue (MB) detection and were found to be sensitive evident from the data obtained at a very low concentration of 500pM. Furthermore, we observed that the SERS signal variations on the substrate were <11.2% indicating the reproducible nature of these substrates. Additionally, we demonstrate that these substrates can be reused (we establish this for three times consecutively) by detecting malachite green (MG) and an explosive molecule (picric acid, PA) followed by the mixture compound (Rhodamine 6G+MB) through employment of simple cleaning procedures. The detected molecular concentrations in terms of masses were found to be 3.2 pg, 36.5 pg, and 23 ng for MB (for a concentration of 500pM), MG (for a concentration of 5nM), and PA (for a concentration of 5μM), respectively. Furthermore, these Fe NSs exhibited superior batch‐to‐batch reproducibility with a relative standard deviation (RSD) value of ~l4%. The proposed method of fabricating ripple structures as SERS platforms are highly feasible, reliable, and have great potential for on‐site detection of several analyte molecules with an easily transportable Raman spectrometer.

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“…[23] The surface micro/nanostructures and surface low energy modification are both needed for generating superhydrophobicity. [25][26][27] However, directly using the self-cleaning property can offer more advantages for practical application of the substrate. [25][26][27] However, directly using the self-cleaning property can offer more advantages for practical application of the substrate.…”

mentioning

confidence: 99%

Superhydrophobic 3D Forest‐Like Ag Microball/Nanodendrite Hierarchical Structure as SERS Sensor for Rapid Droplets Detection

Gao

You

Yang

et al. 2019

Adv Materials Inter

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are dedicated to find a facile and easy way preparing the 3D nanostructures with outstanding SERS performance. [17,18] Electrochemical deposition approach was commonly used for fabrication of nanostructures to obtain high catalytic effectiveness on electrodes. [19,20] It has been considered as a rapid and low-cost method for synthesizing SERS substrates in recent years. [21,22] Morphology of the substrates can be easily controlled by adjusting the voltage, constant and concentration of the analyte, greatly improving the preparing efficiency.Surface superhydrophobicity have drawn much attention in various fields for its self-cleaning and recyclable properties. [23] The surface micro/nanostructures and surface low energy modification are both needed for generating superhydrophobicity. [24] Studies on preparing SERS substrates with superhydrophobicity have been explored gradually, normally utilizing aggregation of the probe molecule droplets to enhance the detection limit. [25][26][27] However, directly using the self-cleaning property can offer more advantages for practical application of the substrate. Shin et al. prepared a novel SERS sensor with low adhesive property to detect the droplets rapidly for real-time chemical and biological monitoring. [28] Traditional SERS detection is usually proceeded by drying the probe molecule solution on substrates for contacting with the noble metal nanostructures, which needs several hours' immersing time. [29,30] If sample droplets can be tested directly on the substrate, it will greatly improve the testing efficiency and be available in practical application.We designed a 3D Ag forest-like micro/nanostructure by electrochemical deposition of Ag nanodendrites on the Ag microwool ball structures, acting as an upholder for the nanodendrites vertically growing. The deposition process was facile and needed only several minutes to generate the structures. Superior SERS performance of the substrate was verified by comparing different morphologies with Ag nanodendrites or microball structures growing on film and electromagnetic field distribution simulation. The superiority was caused by the standing nanotips on the dendrites and nanogaps among the standing Ag nanodendrites. Superhydrophobicity was induced to the substrate for the purpose of rapid detecting. Directly SERS detections on sample droplets were tested with detection Real environment detection application by surface-enhanced Raman scattering (SERS) requires substrates with high sensitivity, rapid detection, and low cost. In this study, a rapid SERS detection of liquid droplets sample by a superhydrophobic 3D forest-like Ag microball/nanodendrite hierarchical structure is reported. Easy preparation is provided by electrochemical deposition method, developing a Ag forest-like hierarchical nanostructure. The vertically standing nanodendrites offer more amounts of SERS "hot spots" for enhancing the Raman signals. At the same time, the micro/nanostructures supply suitable condition for superhydrophobicity by low surface energ...

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Low-adhesive superhydrophobic surface-enhanced Raman spectroscopy substrate fabricated by femtosecond laser ablation for ultratrace molecular detection

Abstract: LAS-SERS can detect the analytes of highly diluted solutions as low as sub-pico-molar concentration from only 20 μL solutions.

Cited by 69 publications

References 27 publications

Cylindrically Focused Nonablative Femtosecond Laser Processing of Long‐Range Uniform Periodic Surface Structures with Tunable Diffraction Efficiency

Cylindrically Focused Nonablative Femtosecond Laser Processing of Long‐Range Uniform Periodic Surface Structures with Tunable Diffraction Efficiency

Surface‐enhanced Raman scattering studies of gold‐coated ripple‐like nanostructures on iron substrate achieved by femtosecond laser irradiation in water

Superhydrophobic 3D Forest‐Like Ag Microball/Nanodendrite Hierarchical Structure as SERS Sensor for Rapid Droplets Detection

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