Effect of Au and Au@Ag core–shell nanoparticles on the SERS of bridging organic molecules

Güzel, Remziye; Üstündağ, Zafer; Ekşi, Haslet; Keskin, Selda; Taner, Bılge; Durgun, Zeynep Gülşah; İsbir-Turan, Aybüke A.; Solak, Alı Osman

doi:10.1016/j.jcis.2010.07.039

Cited by 58 publications

(62 citation statements)

References 57 publications

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“…6b), a new peak at 287.2 eV supposed to be amide carbons appeared in the fine structure of the C1s peak of PEEK-GRGD (Fig. 6c) [28,29]. The content at these positions (286.0 and 289.4 eV) increased from PEEK-COOH to PEEK-GRGD (Table 1) is attributed to the C-N species, and carboxyl and guanidine carbons introduced by GRGD [25], respectively.…”

Section: Immobilization Grgd On Peek Surfacementioning

confidence: 97%

Covalent attachment of cell-adhesive peptide Gly-Arg-Gly-Asp (GRGD) to poly(etheretherketone) surface by tailored silanization layers technique

Xiong

Zhang

2014

Applied Surface Science

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Section: Immobilization Grgd On Peek Surfacementioning

confidence: 97%

Covalent attachment of cell-adhesive peptide Gly-Arg-Gly-Asp (GRGD) to poly(etheretherketone) surface by tailored silanization layers technique

Xiong

Zhang

2014

Applied Surface Science

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“…The Au@AgCSNPs, being inorganic/inorganic CSNPs and consisting of an Au core and an Ag shell, have been acknowledged to display many unique optical [11,18], catalytic [19], oxidative [20], and biosensoring properties [21], particularly due to the properties of both noble metals nanostructures. The exceptional optical properties of Au@AgCSNPs are dependent on the configuration of the metal core and metal shell.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the AuNPs constitute the templates for the Ag nanoshell growth. The shell of the Au@AgSCNPs gives rise to nanoparticles with the optical properties that are similar to those displayed by AgNPs, such as the d-s band gap in the UV region, making them useful in surface-enhanced Raman scattering (SERS) [18,22,23]. For example, Liu and Guyot-Sionnest [23] reported that an Ag nanoshell deposited on AuNPs exhibits an additional damping of the plasmon, caused by the extra scattering of the Au@AgCSNPs nanorods, which make them more effective in the SERS system.…”

Section: Introductionmentioning

confidence: 99%

Application of Direct Current Atmospheric Pressure Glow Microdischarge Generated in Contact with a Flowing Liquid Solution for Synthesis of Au-Ag Core-Shell Nanoparticles

2016

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A direct current atmospheric pressure glow microdischarge (dc-μAPGD) generated between an Ar nozzle microjet and a flowing liquid was applied to produce Au-Ag core-shell nanoparticles (Au@AgCSNPs) in a continuous flow system. Firstly, operating dc-μAPGD with the flowing solution of the Au(III) ions as the cathode, the Au nanoparticles (AuNPs) core was produced. Next, to produce the core-shell nanostructures, the collected AuNPs solution was immediately mixed with an AgNO3 solution and passed through the system with the reversed polarity to fabricate the Ag nanoshell on the AuNPs core. The formation of Au@AgCSNPs was confirmed using ultraviolet-visible (UV-Vis) absorbance spectrophotometry, transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS). Three localized surface plasmon resonance absorption bands with wavelengths centered at 372, 546, and 675 nm were observed in the UV-Vis spectrum of Au@AgCSNPs, confirming the reduction of both the Au(III) and Ag(I) ions. The right configuration of metals in Au@AgCSNPs was evidenced by TEM. The Au core diameter was 10.2 ± 2.0 nm, while the thickness of the Ag nanoshell was 5.8 ± 1.8 nm. The elemental composition of the bimetallic nanoparticles was also confirmed by EDS. It is possible to obtain 90 mL of a solution containing Au@AgCSNPs per hour using the applied microdischarge system.

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“…A generally modified surface can drastically improve the electrocatalytic properties of electroactive groups, increase the electron transfer rate, and increase the sensitivity of the electrode response (Omidinia et al 2014). Various methods, such as electrochemical (Baraket et al 2013), self-assembled monolayers (SAMs) (Güzel et al 2010), chemical (Üstündağ and Solak 2009), and physical (Gupta et al 2013) techniques have been reported for the electrochemical quantitative analysis in various environmental and food samples. Most of the transition metals, such as Cu, Cd, Co, Fe, Ni, Zn, etc., and a lot of other metals, such as Sn, As, Sb, Pb, Bi, etc., are analyzed via electrochemical voltammetric methods.…”

Section: Introductionmentioning

confidence: 99%

Carbonaceous Materials-12: a Novel Highly Sensitive Graphene Oxide-Based Carbon Electrode: Preparation, Characterization, and Heavy Metal Analysis in Food Samples

et al. 2015

Self Cite

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Graphene oxide (GO) was covalently attached to glassy carbon (GC) electrode (GC-O-GO) for fabricating nanosensors to determine trace Pb 2+ and Cd 2+ using differential pulse anodic stripping voltammetry (DPASV). Surface characterization of the nanofilm-covered electrode was performed via electrochemical cyclic voltammetry (CV), transmission electron microscopy (TEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) techniques. Surface pKa of the GO covalent attached GC (GC-O-GO) was calculated via CV. Under optimal conditions, a linear response was found for Pb 2+ and Cd 2+ in the range from 1×10 −8 to 1×10 −12 M. The limit of detections (LODs) of Pb 2+ and Cd 2+ were 0.25 pM and 0.28 pM, respectively. The method shows good reproducibility, and stability was successfully applied to measure Pb 2+ and Cd 2+ levels in rice, soya, milk, and tap water samples, with good agreement with those obtained by the standard inductively coupled plasma optical emission spectrometry (ICP-OES) method. The method was evaluated by application with the simultaneous determination of the ions in food samples (n=6) using the standard addition method. The recoveries of the Pb 2+ and Cd 2+ were up to 98 %.

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Effect of Au and Au@Ag core–shell nanoparticles on the SERS of bridging organic molecules

Cited by 58 publications

References 57 publications

Covalent attachment of cell-adhesive peptide Gly-Arg-Gly-Asp (GRGD) to poly(etheretherketone) surface by tailored silanization layers technique

Covalent attachment of cell-adhesive peptide Gly-Arg-Gly-Asp (GRGD) to poly(etheretherketone) surface by tailored silanization layers technique

Application of Direct Current Atmospheric Pressure Glow Microdischarge Generated in Contact with a Flowing Liquid Solution for Synthesis of Au-Ag Core-Shell Nanoparticles

Carbonaceous Materials-12: a Novel Highly Sensitive Graphene Oxide-Based Carbon Electrode: Preparation, Characterization, and Heavy Metal Analysis in Food Samples

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