Properties of ordered titanium templates covered with Au thin films for SERS applications

Grochowska, Katarzyna; Siuzdak, Katarzyna; Sokołowski, Michał; Karczewski, Jakub; Szkoda, Mariusz; Śliwiński, Gerard

doi:10.1016/j.apsusc.2016.01.186

Cited by 16 publications

(5 citation statements)

References 42 publications

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“…In some studies, a quantitative determination for a trace amount of a target analyte in a sample has been done [25,26]. The EF of Au NPs (3.0)/ p ZrO 2 is calculated to be 7.0 × 10 7 , typically comparable to an averaged EF of recently-developed Au/oxide composite as SERS substrate [27,28], in particular with Au/ZrO 2 nanofiber substrate that exhibited an EF of 10 7 [28].…”

Section: Resultsmentioning

confidence: 99%

SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides

et al. 2019

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Health risks posed by the exposure to trace amounts of pesticide residue in agricultural products have gained a lot of concerns, due to their neurotoxic nature. The applications of surface-enhanced Raman Scattering (SERS) as a detection technique have consistently shown its potential as a rapid and sensitive means with minimal sample preparation. In this study, gold nanoparticles (Au NPs) in elliptical shapes were collected into a layer of ordered zirconia concave pores. The porous zirconia layer (pZrO2) was then deposited with Au NPs, denoted as Au NPs (x)/pZrO2, where x indicates the deposition thickness of Au NPs in nm. In the concave structure of pZrO2, Au-ZrO2 and Au-Au interactions provide a synergistic and physical mechanism of SERS, which is anticipated to collect and amplify SERS signals and thereafter improve the enhancement factor (EF) of Au NPs/pZrO2. By taking Rhodamine 6G (R6G) as the test molecule, EF of Au NPs/pZrO2 might reach to 7.0 × 107. Au NPs (3.0)/pZrO2 was then optimized and competent to detect pesticides, e.g., phosmet and carbaryl at very low concentrations, corresponding to the maximum residue limits of each, i.e., 0.3 ppm and 0.2 ppm, respectively. Au NPs (3.0)/pZrO2 also showed the effectiveness of distinguishing between phosmet and carbaryl under mixed conditions. Due to the strong affinities of the phosphoric groups and sulfur in phosmet to the Au NPs (3.0)/pZrO2, the substrate exhibited selective detection to this particular pesticide. In this study, Au NPs (3.0)/pZrO2 has thus demonstrated trace detection of residual pesticides, due to the substrate design that intended to provide collective amplification of SERS.

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Section: Resultsmentioning

confidence: 99%

SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides

et al. 2019

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“…In addition, the amount of silver particles electrodeposited on the fibers can be modified to control the number of hot spots in the support, thus causing the substrate to have a greater amplification effect [16][17][18][19]. Therefore, the development of a controlled structure composite, with a high number of hot spots, using a simple and low-cost method, will be of great benefit in areas such as diagnosis, analytical chemistry, pharmacy, biomedical, and photovoltaic technologies, as well as in studies on forensic and cultural heritage where SERS and SEIRAS are very useful techniques [4,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Surface Enhanced Infrared Absorption Studies of SiO2–TiO2–Ag Nanofibers: Effect of Silver Electrodeposition Time on the Amplification of Signals

2021

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Surface Enhanced on Infrared Absorption (SEIRAS) and Raman Spectroscopy (SERS) are nondestructive analytic techniques used to detect low concentrations and recognize the fingerprints of molecules. The recognition of the absorption from samples by conventional infrared spectroscopy (IR) via Attenuated Total Reflection (ATR) is difficult for molecules with a low signal strength. However, developed structures with SERS and SEIRAS effect present problems such as high cost, low stability, and low compatibility. Research into new media to obtain greater amplification is largely based on the creation of nanoscale structures with symmetrical arrangements and reproducible distances, resulting in aggregates of nanoparticles that help generate hot spots which are active for amplification. The sol-gel and electrospinning method for the obtention of ceramics provides an alternative means by which to produce said substrates. Fibers of nanometric scale provide an increase of surface area which allows more contact to occur with analytes. Consequently, in this study, a silica-titania-silver nanostructured support that amplifies signal intensity for Raman and infrared spectroscopy was developed. The silica-titania support was developed by sol-gel and electrospinning techniques, and the as spun fibers were treated at 800 °C. Then, the ceramic fibrous membrane was placed on conductive indium tin oxide plastic to be doped with silver using an electroplating technique, varying the silver nitrate concentration (5, 10 and 20 mM), as well as electrodeposition times (1, 2, 5 and 10 min), with a constant voltage (1 V). Twelve different supports were obtained that showed amplification. The enhancement of infrared signals from pyridine and crystal violet molecules adsorbed on silica-titania-silver (SiO2–TiO2–Ag) nanofibers was studied in situ by Attenuated Total Reflection-Fourier Transformed Infrared Spectroscopy (ATR-FTIR). The highest amplification was obtained by the support doped at 10 min in a 10 mM concentration, with an amplification factor of 2.74 in the band localized at 3301 cm−1. In Raman spectroscopy, the highest amplification factor was 27.03, on the support doped for 5 min at a concentration of 5 mM.

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“…Nanosphere lithography can be used to obtain nanotriangles [23] and nanocones [24]. Much attention has been also given to the deposition of metal onto nano- and micro-structured surfaces made of glass [25–26], GaN [27–29], Si [30], TiO 2 [31], Al 2 O 3 [32], Ti [33], polymers [34], or planar surfaces coated with nano/microspheres resulting in metal film on nanospheres MFON [35–36], and Au nanocrescents on a monolayer of polystyrene nanospheres [37]. Additionally glancing-angle deposition (GLAD) has been explored for the fabrication of vertical nanorods on planar substrates [38].…”

Section: Introductionmentioning

confidence: 99%

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

Liszewska

Budner

Norek

et al. 2019

Beilstein J. Nanotechnol.

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Surface-enhanced Raman spectroscopy (SERS) is a very promising analytical technique for the detection and identification of trace amounts of analytes. Among the many substrates used in SERS of great interest are nanostructures fabricated using physical methods, such as semicontinuous metal films obtained via electron beam physical vapor deposition. In these studies, we investigate the influence of morphology of semicontinuous silver films on their SERS properties. The morphologies studied ranged from isolated particles through percolated films to almost continuous films. We found that films below the percolation threshold (transition from dielectric-like to metal-like) made of isolated silver structures provided the largest SERS enhancement of 4-aminothiophenol (4-ATP) analyte signals. The substrate closest to the percolation threshold has the SERS signal about four times lower than the highest signal sample.

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Properties of ordered titanium templates covered with Au thin films for SERS applications

Cited by 16 publications

References 42 publications

SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides

SERS-Active Substrate with Collective Amplification Design for Trace Analysis of Pesticides

Surface Enhanced Infrared Absorption Studies of SiO2–TiO2–Ag Nanofibers: Effect of Silver Electrodeposition Time on the Amplification of Signals

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

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