The interparticle gap manipulation of Au-Ag nanoparticle arrays deposited on flexible and atmospheric plasma-treated PDMS substrate for SERS detection

Cheng, Yuanna; Hsiao, Chia-Wei; Zeng, Ziling; Syu, Wei-Lin; Liu, Ting Yu

doi:10.1016/j.surfcoat.2020.125653

Cited by 30 publications

(4 citation statements)

References 24 publications

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“…As a multifunctional polymer elastomer, poly(dimethylsiloxane) (PDMS) ,, exhibits ultrahigh flexibility and transparency, high mechanical strength, and strong adhesion, and it can be easily manufactured into a variety of sizes and shapes. Importantly, PDMS molecules have a low scattering cross section and do not affect the Raman signal of the sample; thus, it is suitable for being used as a flexible SERS substrate.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible Pyramid Array as SERS Substrate for Direct Sampling and Reproducible Detection

Wang,

Chen

et al. 2023

Anal. Chem.

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Rapid extraction and analysis of target molecules from irregular surfaces are in high demand in the field of on-site analysis. Herein, a flexible platform used for surface-enhanced Raman scattering (SERS) based on an ordered polymer pyramid structure with half-imbedded silver nanoparticles (AgNPs) was prepared to address this issue. The fabrication includes the following steps: (1) creating inverted pyramid arrays in silicon substrate, (2) preparing a layer of AgNPs on the surface of the inverted pyramids, and (3) obtaining a substrate with an ordered polymer pyramids array with half-imbedded AgNPs by the molding method. This flexible substrate is capable of rapid extraction via a simple and convenient "paste and peel off" method. In addition, the substrate exhibits great repeatability and good sensitivity thanks to the uniformity and larger surface area of the ordered pyramids. The density of "hot spots" (local electromagnetic field with high intensity) is increased on the structured surface. Semi-imbedding silver particles in the polymer pyramids makes "hot spots" robust on the substrate. In addition, the preprepared silicon template with the inverted pyramids can be reused, which greatly reduces the production cost. With this substrate, we successfully analyzed thiram molecules on the epidermis of apples, cucumbers, and oranges, and the detection limits are 2.4, 3, and 3 ng/cm 2 , respectively. These results demonstrate the great potential of the substrate for in situ analysis, which can provide reference for the design of ideal SERS substrates.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible Pyramid Array as SERS Substrate for Direct Sampling and Reproducible Detection

Wang,

Chen

et al. 2023

Anal. Chem.

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“…Hence, there is urgent need for flexible substrates for practical applications. Cotton [14], paper [15], and polymers [16,17] have been used to fabricate flexible substrates, which were used either by swabbing irregular surfaces or in situ sensing facilitated by the transparency of some flexible polymers. Besides, there have been many attempts to fabricate polydimethylsiloxane (PDMS)based substrates, which have high transparency, flexibility, stability, and are easy to prepare.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of highly sensitive and uniform Ag/PS/PDMS SERS substrate and its application for in-situ detection

Xu¹,

Shen²,

Zhang³

et al. 2022

Nanotechnology

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In this study, we developed a flexible and transparent silver/polystyrene/polydimethylsiloxane (Ag/PS/PDMS) substrate with both high density of hot spots and satisfactory uniformity using a cost-effective approach. Via template-guided self-assembly, PS beads were arranged regularly in nanobowls of a square array on PDMS, whose surface structure was transferred from a commercial CMOS chip. Roughness was introduced onto the PS bead surface by nitrogen plasma treatment, followed by sputtering of Ag which generated many hot spots. Differential roughness on the PS bead surface greatly influenced the morphology of the Ag/PS/PDMS substrate. A meat-ball like surface structure was formed with a plasma etching time of 5 min, whose growth mechanism was proposed based on the SEM analysis. The high sensitivity and desirable uniformity of the meat-ball like Ag/PS/PDMS substrate were demonstrated by using crystal violet (CV) as a Raman reporter, exhibiting an enhancement factor (EF) of 2.7×107 and a relative standard deviation (RSD) of 5.04%. Thiram of a lower concentration than the maximum residue limit (MRL) on the cucumber surface could easily be detected in-situ by the proposed substrate, demonstrating its great potential for in-situ food safety analysis.

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“…Recently, flexible substrates have attracted enormous attention in the SERS field because of various advantages over rigid substrates, such as facile fabrication and shape control [ 12 ]. In contrast to conventional rigid substrates, flexible materials, such as polymers [ 16 , 17 ], papers [ 18 ], and nanofiber [ 19 ] films, have excellent flexibility that allows them to be attached to arbitrary surfaces for in situ detection. This property could further collect analytes, by pasting and peeling off from irregular surfaces, for rapid detection that avoids complex pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Flexible PDMS-Based SERS Substrates Replicated from Beetle Wings for Water Pollutant Detection

Cheng

Chen

et al. 2022

Polymers

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The flexible surface-enhanced Raman scattering (SERS) sensor, which has the bionic 3D nanoarray structure of a beetle-wing substrate (BWS), was successfully prepared by replicated technology and thermal evaporation. The bionic structure was replicated with polydimethylsiloxane (PDMS) and then silver (Ag) nanoisland thin films were deposited by thermal evaporation. The deposition times and thicknesses (25–40 nm) of the Ag thin films were manipulated to find the optimal SERS detection capability. The Ag nanoisland arrays on the surface of the bionic replicated PDMS were observed by scanning electron microscope (SEM), X-ray diffraction (XRD), and contact angle, which can generate strong and reproducible three-dimensional hotspots (3D hotspots) to enhance Raman signals. The water pollutant, rhodamine 6G (R6G), was used as a model molecule for SERS detection. The results show that 35 nm Ag deposited on a PDMS-BWS SERS substrate displays the strongest SERS intensity, which is 10 times higher than that of the pristine BWS with 35 nm Ag coating, due to the excellent 3D bionic structure. Our results demonstrate that bionic 3D SERS sensors have the potential to be applied in wearable devices and sensors to detect biomolecules and environmental pollutants, such as industrial wastewater, in the future.

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The interparticle gap manipulation of Au-Ag nanoparticle arrays deposited on flexible and atmospheric plasma-treated PDMS substrate for SERS detection

Cited by 30 publications

References 24 publications

Fabrication of Flexible Pyramid Array as SERS Substrate for Direct Sampling and Reproducible Detection

Fabrication of Flexible Pyramid Array as SERS Substrate for Direct Sampling and Reproducible Detection

Fabrication of highly sensitive and uniform Ag/PS/PDMS SERS substrate and its application for in-situ detection

Flexible PDMS-Based SERS Substrates Replicated from Beetle Wings for Water Pollutant Detection

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