Assembly of Dithiocarbamate-Anchored Monolayers on Gold Surfaces in Aqueous Solutions

Zhu, Heng; Coleman, Donna M.; Dehen, Christopher J.; Geisler, Iris; Zemlyanov, Dmitry; Chmielewski, Jean; Simpson, Garth J.; Wei, Alexander

doi:10.1021/la801254b

Cited by 58 publications

(89 citation statements)

References 66 publications

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“…GSH is a tripeptide containing cysteine, which can bind on the surface of AuNPs or AgNPs via its thiol side chains. [29][30][31] In our experiments, GSH was selected as an additive in the mixture of relative colloids for the studies of recognition mechanism. Herein, three different analytical processes were designed for the investigation.…”

Section: Recognition Mechanisms For Both Nanoparticlesmentioning

confidence: 99%

Comparative Studies on the Quick Recognition of Melamine Using Unmodified Gold Nanoparticles and p‐Nitrobenzenesulfonic Grafted Silver Nanoparticles

Bai

Dong

Zhang

et al. 2011

J Chinese Chemical Soc

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Both unmodified gold nanoparticles (AuNPs) and p-nitrobenzenesulfonic (p-NBS) grafted silver nanoparticles (AgNPs) were prepared by chemical synthesis, respectively. They could be used for visual detection via the interaction with the twelve amide compounds including melamine. These color changes could be seen with the naked eye directly and monitored by ultraviolet visible (UV-Vis) absorbance spectra. The recognition mechanism for both nanoparticles was comparatively investigated by the addition of glutathione (GSH) in the presence of melamine, respectively. The triple hydrogen bonding recognition and the attractive van der Waals interactions between melamine (0.5 mg/L) and AuNPs were responsible for the color change during its aggregation (red-to-purple or blue), whilst the electron donor-acceptor interaction between melamine (0.2 mg/L) and p-NBS modified on the surface of AgNPs resulted in the color changes (yellow-to-grey or dark green).

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Section: Recognition Mechanisms For Both Nanoparticlesmentioning

confidence: 99%

Comparative Studies on the Quick Recognition of Melamine Using Unmodified Gold Nanoparticles and p‐Nitrobenzenesulfonic Grafted Silver Nanoparticles

Bai

Dong

Zhang

et al. 2011

J Chinese Chemical Soc

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“…In order to mimic a gold surface subjected to rigorous cleaning treatments with piranha solution, we have treated a gold film in O 2 plasma [1]. Oxygen plasma removed the carbon contamination and produced a metastable oxide layer, which is sufficiently long-lived under vacuum conditions to permit its characterization by XPS (see Fig.…”

Section: Surface Science Application (I)mentioning

confidence: 99%

“…2). This data was used to identify the assembling mechanism of dithiocarbamate-anchored monolayers on Au substrates in aqueous solutions [1]. …”

mentioning

confidence: 99%

Plasma Cleaning Applications for Surface Science and Model Catalyst Samples

et al. 2009

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We used the Evactron plasma cleaning system, a device manufactured by XEI Scientific, Inc. (www.Evactron.com), for three applications in catalysis and surface science, described below. The Evactron produces low power RF O 2 plasma that oxidizes and removes hydrocarbon contamination. This type of contamination can be found on the surface of any sample transported in air and the contamination greatly hampers characterization of the sample by surface sensitive techniques such as X-ray Photoelectron Spectroscopy (XPS). Removal of carbon-like impurities without sample damage can be a key issue on some studies. I. Catalytic application:Industrial catalysts are often complex systems in which the active phase is buried within a porous support. Fundamental surface studies of these catalysts can be difficult, if not impossible. Surface sensitive techniques provide limited information in this case because the catalytically active particles are buried inside the pores of the catalyst. To avoid this problem, a model catalyst is made by depositing the component on the surface of a flat, non-porous substrate. This sample can then be easily accessed by surface sensitive tools. One of the difficulties in working with a model catalyst is cleaning its surface without disturbing the subnanometer-sized catalytic structures and the flat support.Platinum clusters with 7-10 atoms prepared at Argonne National Laboratory were deposited on an alumina film over a Si wafer and then were transported in air into our UHV system. Oxygen plasma oxidation created by the Evactron was used to rid the surface of carbon contamination. The amount of carbon decreased by 5-6 times after the catalyst was cleaned using the Evactron RF O 2 plasma. However, the treatment oxidized the Pt such that the Pt 4f peak shifted beneath the Al 2p peak, as shown in Fig. 1. Oxidized Pt can be reduced back to the metallic state in a H 2 atmosphere. II. Surface Science application (I):In order to mimic a gold surface subjected to rigorous cleaning treatments with piranha solution, we have treated a gold film in O 2 plasma [1]. Oxygen plasma removed the carbon contamination and produced a metastable oxide layer, which is sufficiently long-lived under vacuum conditions to permit its characterization by XPS (see Fig. 2). This data was used to identify the assembling mechanism of dithiocarbamate-anchored monolayers on Au substrates in aqueous solutions [1]. III. Surface Science application (II):The wide-band gap semiconductor zinc oxide (ZnO) is a material with much potential for future electronic devices. Despite significant interest in its fundamental electronic properties, there are few spectroscopic studies of the ZnO surface. The surface properties of ZnO are dependent on the amount of surface contamination. In this case, the

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“…An approach using the in situ formation of dithiocarbamates (DTC) to, in only one-step, immobilize compounds with amine groups to gold surfaces has been developed as an efficient alternative [11][12][13]. Briefly, carbon disulfide spontaneously reacts with amine groups to form DTC through the immersion of gold substrates in a solution containing CS 2 and the compound to immobilize, at room temperature [11,14,15], without the need of adding several modification and activation steps. DTC have a resonant bidentate structure along N-C-S 2 and establish strong linkages to gold substrates [16].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured interfaces with site-specific bioreceptors for immunosensing

Paiva

Almeida

Marquês

et al. 2017

Applied Surface Science

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a b s t r a c tIn this work, we propose a simple and effective approach to build nanostructured immunosensor platforms. The one-step strategy relies on i) the in situ formation of dithiocarbamates from the reaction between carbon disulfide and amine groups, present on protein A, ii) their attachment to gold nanoparticles (AuNPs), and iii) the linkage of the modified AuNPs to the electrode surface, which depends on the strong interaction between gold substrates and sulfur moieties. AuNPs and protein A are used to increase the surface coverage of Immunoglobulin G (IgG) and promote the oriented immobilization of the antibodies on the immunosensing interface. The modified gold surfaces with biomolecules were thoroughly characterized by a combination of techniques: UV-vis spectrophotometry, conventional ellipsometry and atomic force microscopy. The immunosensor performance was assessed in real-time, by surface plasmon resonance and by the highly sensitive total internal reflection imaging ellipsometry, through the specific biorecognition between anti-IgG and the immobilized IgG molecules. We demonstrate that the presence of AuNPs improves the sensitivity of the anti-IgG specific detection, whereas the presence of co-adsorbed CS 2 is responsible for blocking the undesired protein nonspecific adsorption to the gold substrate. Overall, we report a simple and innovative one-step method, to chemically modify gold surfaces with protein A and AuNPs, able to specifically detect antigen/antibody interactions with capability of preventing protein nonspecific adsorption.

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Assembly of Dithiocarbamate-Anchored Monolayers on Gold Surfaces in Aqueous Solutions

Cited by 58 publications

References 66 publications

Comparative Studies on the Quick Recognition of Melamine Using Unmodified Gold Nanoparticles and p‐Nitrobenzenesulfonic Grafted Silver Nanoparticles

Comparative Studies on the Quick Recognition of Melamine Using Unmodified Gold Nanoparticles and p‐Nitrobenzenesulfonic Grafted Silver Nanoparticles

Plasma Cleaning Applications for Surface Science and Model Catalyst Samples

Nanostructured interfaces with site-specific bioreceptors for immunosensing

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