Comparison between silver and gold nanoparticles stabilized with negatively charged hydrophilic thiols: SR-XPS and SERS as probes for structural differences and similarities

Carlini, Laura; Fasolato, Claudia; Postorino, P.; Fratoddi, Ilaria; Venditti, Iole; Testa, Giovanna; Battocchio, Chiara

doi:10.1016/j.colsurfa.2017.05.045

Cited by 73 publications

(65 citation statements)

References 34 publications

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“…This technique can be used to find, through the SERS phenomenon, the normal modes from molecules linked to the AgNPs in colloidal suspension. Carlini et al employed spin‐resolved X‐ray photoelectron spectroscopy and SERS to evaluate negatively charged hydrophilic organicthiol sodium 3‐mercapto‐1‐propanesulfonate on AgNPs and gold nanoparticles (AuNPs) . On the other hand, Prado et al analyzed the substitution of citrate by either thiocyanate or sulfide ions by changes in the normal vibration modes on the AuNPs surface .…”

Section: Introductionmentioning

confidence: 99%

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Fá

López–Corral

Faccio

et al. 2018

J Raman Spectroscopy

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The role of α‐ and β‐d‐glucose, and d‐gluconate anion, acting as capping agent, on silver nanoparticles (AgNPs) was evaluated using both Raman and density functional theory studies. The particles were synthetized employing glucose, as reducing and blocking agent, in alkaline conditions. Capping agents were characterized through surface enhancement Raman spectroscopy together with modeling performed using silver clusters. Several geometries were optimized, and its energies and wavenumbers were calculated for each of them. Vibration normal modes from d‐glucose isomers and d‐gluconate were obtained and compared with those reported in bibliography, showing a satisfactory correlation. Comparison between experimental and calculated frequencies reveals a preference for d‐gluconate anion acting as capping agent under the necessary presence of d‐glucose on the surface of the AgNPs. The study of energies shows a greater affinity of d‐gluconate for the silver atoms (above −1.3 eV for both geometries) than for other configurations of the glucose molecule (about −0.66 eV in the case of α‐d‐glucose).

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Section: Introductionmentioning

confidence: 99%

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Fá

López–Corral

Faccio

et al. 2018

J Raman Spectroscopy

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“…The Au 4f 7/2 binding energy is centred at 85.0 eV. This value is slightly higher than that for metallic gold (usually at 84.0 eV) and is attributed to slightly positive surface gold atoms that are chemically bonded to the thiol moieties …”

Section: Resultsmentioning

confidence: 85%

Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications

Massaro

Colletti

Fiore

et al. 2018

Applied Organom Chemis

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A highly sustainable prototype of a flow system based on gold nanoparticles (4.2 nm) supported on thiol‐functionalized halloysite nanotubes (HNTs) was developed for catalytic applications. The catalytic performances were evaluated using the reduction of 4‐nitrophenol to 4‐aminophenol as a model system. Under the best experimental conditions (0.0001 mol%, 1.97 × 10−8 mg of Au nanoparticles), an impressive apparent turnover frequency value up to 2 204 530 h−1 was achieved and the halloysite‐based catalyst showed full recyclability even after ten cycles. The high catalytic activity confirms the importance of the use of HNTs as support for Au nanoparticles that can exert a synergistic effect both as medium for transfer of electrons from borohydride ions to 4‐nitrophenol and by modulating interfacial electron transfer dynamics. With the application of flow technology, the obtained heterogeneous HNT@Au catalyst was fully recovered and reused for at least one month.

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“…Initially, we modified the Hp biomarker in the OCF by adding a sulfhydryl group so that it can bind to previously anchored Au NPs inside the fiber . To realize this, the clinical samples were incubated with EDTA and Traut's reagent for 30 minutes.…”

Section: Methodsmentioning

confidence: 99%

Development of highly reliable SERS‐active photonic crystal fiber probe and its application in the detection of ovarian cancer biomarker in cyst fluid

Beffara

Perumal

Mahyuddin

et al. 2019

Journal of Biophotonics

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Conventionally Surface‐enhanced Raman spectroscopy (SERS) is realized by adsorbing analytes onto nano‐roughened planar substrate coated with noble metals (silver or gold) or their colloidal nanoparticles (NPs). Nanoscale irregularities in such substrates/NPs could lead to SERS sensors with poor reproducibility and repeatability. Herein, we demonstrate a suspended core photonic crystal fiber (PCF) based SERS sensor with extremely high reproducibility and repeatability in measurement with a relative SD of only 1.5% and 4.6%, respectively, which makes it more reliable than any existing SERS sensor platforms. In addition, our platform could improve the detection sensitivity owing to the increased interaction area between the guided light and the analyte, which is incorporated into the holes that runs along the length of the PCF. Numerical calculation established the significance of the interplay between light coupling efficiency and evanescent field distribution, which could eventually determine the sensitivity and reliability of the developed SERS active‐PCF sensor. As a proof of concept, using this sensor, we demonstrated the detection of haptoglobin, a biomarker for ovarian cancer, contained within the ovarian cyst fluid, which facilitated in differentiating the stages of cancer. We envision that with necessary refinements, this platform could potentially be translated as a next‐generation highly sensitive SERS‐active opto‐fluidic biopsy needle for the detection of biomarkers in body fluids.

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Comparison between silver and gold nanoparticles stabilized with negatively charged hydrophilic thiols: SR-XPS and SERS as probes for structural differences and similarities

Cited by 73 publications

References 34 publications

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications

Development of highly reliable SERS‐active photonic crystal fiber probe and its application in the detection of ovarian cancer biomarker in cyst fluid

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