Transparent, flexible surface enhanced Raman scattering substrates based on Ag-coated structured PET (polyethylene terephthalate) for in-situ detection

Zuo, Zewen; Zhu, Kai; Gu, Chuan; Wen, Yibing; Cui, Guanglei; Qu, Jun

doi:10.1016/j.apsusc.2016.04.022

Cited by 48 publications

(34 citation statements)

References 34 publications

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“…Other routes include the use of gold or silver nanoparticles of different shapes in solution and their assembly on a solid substrate [ 6 , 13 – 17 ], nanosphere lithography [ 18 – 25 ] as well as nanolithography and nanoimprinting [ 26 – 34 ]. Additional methods appeared in which nanoparticles or metal films are deposited on structured substrates as carbon nanotubes [ 35 – 39 ], graphene foam [ 40 ], nanorod or nanopillar arrays [ 41 – 42 ], biological scaffolds [ 43 – 44 ], black silicon [ 45 – 46 ], anisotropically etched single-crystal silicon [ 47 ], plasma-treated plastic [ 48 ] and anodic aluminum oxide films [ 49 – 52 ]. Some methods aim at the fabrication of three -dimensional silver or gold structures, such as oblique-angle vapor deposition used for the fabrication of silver nanorod arrays [ 53 – 56 ], and nanotransfer printing, which was used to build stacks of gold nanorods or nanowires [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

Okeil¹,

Schneider²

2018

Beilstein J. Nanotechnol.

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The design of efficient substrates for surface-enhanced Raman spectroscopy (SERS) for large-scale fabrication at low cost is an important issue in further enhancing the use of SERS for routine chemical analysis. Here, we systematically investigate the effect of different radio frequency (rf) plasmas (argon, hydrogen, nitrogen, air and oxygen plasma) as well as combinations of these plasmas on the surface morphology of thin silver films. It was found that different surface structures and different degrees of surface roughness could be obtained by a systematic variation of the plasma type and condition as well as plasma power and treatment time. The differently roughened silver surfaces act as efficient SERS substrates showing greater enhancement factors compared to as prepared, sputtered, but untreated silver films when using rhodamine B as Raman probe molecule. The obtained roughened silver films were fully characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron (XPS and Auger) and ultraviolet–visible spectroscopy (UV–vis) as well as contact angle measurements. It was found that different morphologies of the roughened Ag films could be obtained under controlled conditions. These silver films show a broad range of tunable SERS enhancement factors ranging from 1.93 × 102 to 2.35 × 105 using rhodamine B as probe molecule. The main factors that control the enhancement are the plasma gas used and the plasma conditions, i.e., pressure, power and treatment time. Altogether this work shows for the first time the effectiveness of a plasma treatment for surface roughening of silver thin films and its profound influence on the interface-controlled SERS enhancement effect. The method can be used for low-cost, large-scale production of SERS substrates.

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Section: Introductionmentioning

confidence: 99%

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

Okeil¹,

Schneider²

2018

Beilstein J. Nanotechnol.

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“…The most common and readily accessible support matrix of SERS substrate is paper, which possesses cellulose fibers inside, facilitating the flow of analyte solution through microfluidics [77,78]. PET is another type of promising substrate in SERS application due to its unique flexibility and transparency [15,16].…”

Section: Substrate Selectionmentioning

confidence: 99%

“…Enhancing materials have diversified from metallic nanostructures such as Au, Ag, and Cu to the hybrids of noble metals and semiconductors, such as silicon nanohybrid-based SERS substrate [5], Au NPs-graphene oxide hybrid film [6], ZnO and Au/Ag hybrids [7], and Ag-MoS 2 hybrids [8]. Additionally, the support matrix has evolved from rigid substrates such as glass [9], silicon [10], and aluminum [11] to flexible substrates such as paper-based and plastic-based SERS substrates that are lightweight, portable, recyclable [12][13][14][15][16]. Furthermore, a variety of fabrication approaches have been explored including nanolithography [17][18][19], vapor deposition [12,13], self-assembly [20,21], templatebased [11], and inkjet printing [12,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Versatile Silver Nanoparticles-Based SERS Substrate with High Sensitivity and Stability

et al. 2021

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Surface-enhanced Raman scattering has developed into a mature analytical technique useful in various applications; however, the reproducible fabrication of a portable SERS substrate with high sensitivity and good uniformity is still an ongoing pursuit. Reported herein is a rapid fabrication method of an inexpensive SERS substrate that enables sub-nanomolar detection of molecular analytes. The SERS substrate is obtained by application of silver nanoparticles (Ag NPs)-based ink in precisely design patterns with the aid of an in-house assembled printer equipped with a user-fillable pen. Finite-difference time-domain (FDTD) simulations show a 155-times Ag NP electric field enhancement for Ag nanoparticle pairs with particle spacing of 2 nm. By comparing the SERS performance of SERS substrate made with different support matrices and fabrication methods, the PET-printed substrate shows optimal performance, with an estimated sensitivity enhancement factor of 107. The quantitative analysis of rhodamine 6G absorbed on optimized SERS substrate exhibits a good linear relationship, with a correlation coefficient (R2) of 0.9998, between the SERS intensity at 610 cm−1 and the concentration in the range of 0.1 nM—1μM. The practical low limit detection of R6G is 10 pM. The optimized SERS substrates show good stability (at least one month) and have been effectively tested in the detection of cancer drugs, including doxorubicin and metvan.

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“…Flexible SERS substrates present some desirable features compared to conventional rigid substrates in terms of cost and applicability, because their unique mechanical features enable new functionalities and on-board applications. For instance, this is the case of in situ testing of non-planar contaminated surfaces [12,13], which is a particularly important feature in some fields, such as art works and food analysis. Furthermore, the flexible plasmonics research field has provided good advancements in the recent years on the design and fabrication of diverse sustainable chips for daily life applications [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Flexible and Transparent Substrates Based on Gold Nanoparticles and TiO2 for in Situ Bioanalysis by Surface-Enhanced Raman Spectroscopy

et al. 2019

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Flexible and transparent substrates are emerging as low cost and easy-to-operate support for surface-enhanced Raman spectroscopy (SERS). In particular, in situ SERS detection approach for surface characterization in transmission modality can be efficiently employed for non-invasive analysis of non-planar surfaces. Here we propose a new methodology to fabricate a homogenous, transparent, and flexible SERS membrane by the assistance of a thin TiO2 porous layer deposited on the PDMS surface, which supports the uniform loading of gold nanoparticles over large area. The substrate was first characterized for homogeneity, sensitivity and repeatability using a model molecule for SERS, i.e., 7-mercapto-4-methylcoumarin. Satisfactory intra-substrate uniformity and inter-substrates repeatability was achieved, showing an RSD of 10%, and an analytical sensitivity down to 10 nM was determined with an EF of 3.4 × 105 ± 0.4 × 105. Furthermore, SERS detection of pyrimethanil (PMT), a commonly employed pesticide in crops for human consumption, was performed in situ, exploiting the optical transparency of the device, using both model surfaces and non-flat bio-samples. PMT contamination at the phytochemical concentration levels corresponding to commonly used infield doses was successfully detected on the surface of the yellow Ficus benjiamina leaves, supporting the use of this substrate for food safety in-field application.

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Transparent, flexible surface enhanced Raman scattering substrates based on Ag-coated structured PET (polyethylene terephthalate) for in-situ detection

Cited by 48 publications

References 34 publications

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

Versatile Silver Nanoparticles-Based SERS Substrate with High Sensitivity and Stability

Flexible and Transparent Substrates Based on Gold Nanoparticles and TiO2 for in Situ Bioanalysis by Surface-Enhanced Raman Spectroscopy

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