Flexible and transparent Surface Enhanced Raman Scattering (SERS)-Active Ag NPs/PDMS composites for in-situ detection of food contaminants

Alyami, Abeer; Quinn, Aidan J.; Iacopino, Daniela

doi:10.1016/j.talanta.2019.03.115

Cited by 86 publications

(33 citation statements)

References 34 publications

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“…performed different trials on the addition of Au nanorods in the PVA solution before electrospinning. Zhang et al 107 . have performed a detailed study on fabrication of electrospun nanofibrous surface decorated with Ag NPs.…”

Section: -11mentioning

confidence: 99%

Flexible SERS substrates for hazardous materials detection: recent advances

Moram¹,

Soma²

2021

OEA

165

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This article reviews the most recent advances in the development of flexible substrates used as surface-enhanced Raman scattering (SERS) platforms for detecting several hazardous materials (e.g., explosives, pesticides, drugs, and dyes). Different flexible platforms such as papers/filter papers, fabrics, polymer nanofibers, and cellulose fibers have been investigated over the last few years and their SERS efficacies have been evaluated. We start with an introduction of the importance of hazardous materials trace detection followed by a summary of different SERS methodologies with particular attention on flexible substrates and their advantages over the nanostructures and nanoparticle-based solid/hybrid substrates. The potential of flexible SERS substrates, in conjunction with a simple portable Raman spectrometer, is the power to enable practical/on-field/point of interest applications primarily because of their low-cost and easy sampling.

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Section: -11mentioning

confidence: 99%

Flexible SERS substrates for hazardous materials detection: recent advances

Moram¹,

Soma²

2021

OEA

165

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“…In the fabrication of flexible SERS-active substrates, NSs are first synthesized through wet chemical methods and are then deposited onto a flexible support such as paper [9], polymer strips [1,9,10], or adhesive tapes [11,12] through drop-casting or dip coating. An advantage of flexible support over a conventional rigid one is their capability to perform in situ measurements that would be highly beneficial in monitoring the presence of pesticide residues or organic pollutants on the outer surfaces of agricultural products, for there is no need to perform solvent extraction and invasive sampling [12].…”

Section: Introductionmentioning

confidence: 99%

Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

et al. 2019

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Nanostructures with spikes (NSPs) have been a subject of several surface-enhanced Raman scattering (SERS) applications owing to their significant Raman signal enhancement brought about by the combined effects of interspike coupling and the accumulated induction on the tips of spikes. Thus, NSPs offer great potential as a SERS-active substrate for relevant applications that require a high density of enhanced “hot spots”. In this study, Ag NSPs were synthesized in varying degrees of agglomeration and were thereafter deposited onto a transparent adhesive tape as a flexible substrate for SERS applications, specifically, in the detection of trace amounts of pesticides. These flexible substrates were referred to as Ag NSPs/tape and optimized with an enhancement factor (EF) of ca. 1.7 × 107. A strong resulting signal enhancement could be attributed to an optimal degree of agglomeration and, consequently, the distances among/between spikes. Long spikes on the synthesized core of Ag NSPs tend to be loosely spaced, which are suitable in detecting relatively large molecules that could access the spaces among the spikes where “hot spots” are generally formed. Since one side of the transparent tape is adhesive, the paste-and-peel off method was successful in obtaining phosmet and carbaryl residues from apple peels as reflected in the acquired SERS spectra. In situ trace detection of the pesticides at low concentrations down to 10−7 M could be demonstrated. In situ trace detection of mixed pesticides was possible as the characteristic peaks of both pesticides were observed in equimolar mixtures of the analytes at 10−2 to 10−4 M. This study is, thus, premised upon applying for in situ trace detection on e.g., fruit skin.

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“…To increase the reproducibility of PDMS substrates, assembling the metal nanoparticles on the oil–water interface is an effective strategy and has been employed recently. [ 10,64,65 ] The pre‐prepared nanostructures arrays first came into being at the organic/aqueous interface, then PDMS mixture was added to the organic/aqueous solution, a flexible film decorated with nanostructures was formed on the top of the water layer after being cured, [ 65 ] as illustrated in Figure a. The as‐formed flexible substrate with parts of the nanomaterials fixed in PDMS films.…”

Section: Fabrication Of Flexible Sers Substratementioning

confidence: 99%

Flexible Surface‐Enhanced Raman Scattering Substrates: A Review on Constructions, Applications, and Challenges

Liu

Cao

2021

Adv Materials Inter

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Flexible surface‐enhanced Raman scattering (SERS) substrates have recently attracted growing research interests in real‐world applications due to their unique advantage of sensitivity and flexibility. Reviewing the latest progress of flexible SERS substrates is very important for further development of high‐quality detection platforms. Herein, the recent developments of flexible SERS substrates in fabrications and applications are introduced. First, three categories of current flexible SERS platforms including paper‐based SERS substrates, polymer‐based SERS substrates, and inorganic materials‐based SERS substrates are demonstrated in depth. Then, the focus is moved to the applications of flexible SERS substrates. Combining swab strategies, lateral flow strips, paper‐based microfluidics, and in situ detection techniques, flexible SERS platforms provide intriguing applications in various fields. The challenges are also identified for practical applications on account of substrates’ uniformity, quantitative accuracy, multiplex detection ability, and overall cost. It is believed this review will be of help for researchers to design and fabricate flexible SERS substrates with higher performance and lower cost, and finally realize the practical applications.

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Flexible and transparent Surface Enhanced Raman Scattering (SERS)-Active Ag NPs/PDMS composites for in-situ detection of food contaminants

Cited by 86 publications

References 34 publications

Flexible SERS substrates for hazardous materials detection: recent advances

Flexible SERS substrates for hazardous materials detection: recent advances

Ag Nanostructures with Spikes on Adhesive Tape as a Flexible Sers-Active Substrate for In Situ Trace Detection of Pesticides on Fruit Skin

Flexible Surface‐Enhanced Raman Scattering Substrates: A Review on Constructions, Applications, and Challenges

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