Kinetic Study on Monolayer Formation with 4-Aminobenzenethiol on a Gold Surface

Mohri, Nobuyuki; Inoue, Morimasa; Arai, Yoshifumi; Yoshikawa, Kenichi

doi:10.1021/la00005a033

Cited by 50 publications

(55 citation statements)

References 4 publications

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“…34,64,65 The mechanism of SAM desorption in ethanol was found to be through formation of disulfides. 36 Ethanol is less polar than water and can therefore disrupt hydrophobic interactions in SAMs, making them less stable.…”

Section: 63mentioning

confidence: 99%

Dissociation and Degradation of Thiol-Modified DNA on Gold Nanoparticles in Aqueous and Organic Solvents

et al. 2011

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Gold nanoparticles functionalized with thiol-modified DNA have been widely used in making various nanostructures, colorimetric biosensors, and drug delivery vehicles. Over the past 15 years, significant progress has been made to improve the stability of such functionalized nanoparticles. The stability of the gold-thiol bond in this system, however, has not been studied in a systematic manner. Most information on the gold-thiol bond was obtained from the study of self-assembled monolayers (SAMs). In this study, we employed two fluorophore-labeled and thiol-modified DNAs. The long-term stability of the thiol-gold bond as a function of time, salt, temperature, pH, and organic solvent has been studied. We found that the bond spontaneously dissociated under all tested conditions. The dissociation was favored at high salt, high pH, high temperature and little DNA degradation was observed in our system. Most organic solvents showed a moderate protection effect on the gold-thiol bond. The stability of the gold-thiol bond in the DNA system was also compared with that in SAMs. While there are many similarities, we also observed opposite trends for the salt and ethanol effect. This study suggests that the purified DNA-functionalized gold nanoparticles should be freshly prepared and used in a day or two. Long term storage should be carried out at relatively low temperature in low salt and slight acidic buffers.

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Section: 63mentioning

confidence: 99%

Dissociation and Degradation of Thiol-Modified DNA on Gold Nanoparticles in Aqueous and Organic Solvents

et al. 2011

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“…The resonance essentially arises due to the collective excitations of the electrons in the conduction band; near the surface of the nanoparticles [15]. For silver nanoparticles, the max values were reported in the visible range 400-500 nm [16]. It was observed from the UV-visible results that differently prepared silver nanoparticles differed in their mode of interaction and behaviour with cysteine.…”

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confidence: 99%

Differential interaction of silver nanoparticles with cysteine

Ravindran

Dhas

Chandrasekaran

et al. 2012

Journal of Experimental Nanoscience

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“…From geometry, μ M and A M were calculated to be 2.30 × 10 −6 nm −2 and 44227 nm 2 , respectively. 14,15 Kinetic studies estimate a coverage area of 22 Å per molecule for a close-packed monolayer of p-ATP, 16 giving 4.5 nm −2 for the value of μ S for our setup. H eff was directly measured from the instrumental setup by depth profiling, giving a value of 21.2 μm.…”

Section: Experimental Methodsmentioning

confidence: 99%

Combined atomic force microscopy-Raman mapping of electric field enhancement and surface-enhanced Raman scattering hot-spots for nanosphere lithography substrates

Sweetenham

Notingher

2011

J. Nanophoton

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Downloaded From: http://nanophotonics.spiedigitallibrary.org/ on 08/27/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Abstract. Surface-enhanced Raman spectroscopy (SERS) substrates formed by nanosphere lithography were investigated for their spatial distribution and magnitude of electric field enhancement. An integrated atomic force microscopy and Raman micro-spectroscopy system was used to establish, with high accuracy, the correlation between the local SERS mappings and substrate topography. Using a monolayer of rhodamine 6G as a probe of the local electric field, the high resolution Raman mappings, showed that the highest electric field enhancement originates from the metallic nanostructures rather than the gaps between them. The enhancement factor of the substrates is calculated from Raman spectra of the substrates covered in a monolayer of p-aminothiophenol and spatial measurements, giving a value on the order of 10 5 . The experimental results were confirmed by theoretical calculations using the finite element method.C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Kinetic Study on Monolayer Formation with 4-Aminobenzenethiol on a Gold Surface

Cited by 50 publications

References 4 publications

Dissociation and Degradation of Thiol-Modified DNA on Gold Nanoparticles in Aqueous and Organic Solvents

Dissociation and Degradation of Thiol-Modified DNA on Gold Nanoparticles in Aqueous and Organic Solvents

Differential interaction of silver nanoparticles with cysteine

Combined atomic force microscopy-Raman mapping of electric field enhancement and surface-enhanced Raman scattering hot-spots for nanosphere lithography substrates

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