Investigation of structure and chemical states of self-assembled Au nanoscale particles by angle-resolved X-ray photoelectron spectroscopy

Huang, Xiaohua; Huang, Huizhong; Wu, Nianzu; Hu, Ruisheng; Zhu, Tao; Liu, Zhongfan

doi:10.1016/s0039-6028(00)00483-0

Cited by 46 publications

(34 citation statements)

References 35 publications

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“…S1). The reaction protocol was derived from the corresponding literature [13][14][15], and comprised immersion in the isopropanolic silane solution for 24 h. Additionally, the substrates were also immersed for 1 h and 4 h during the present study to compare the performance for shorter reaction times. For the development of the gas phase reaction, a seminal report by Pavlovic et al [11] served as the starting point.…”

Section: Surface Analysismentioning

confidence: 99%

Gas phase silanization for silicon nanowire sensors and other lab‐on‐a‐chip systems

Steinbach

Sandner

Mizaikoff

et al. 2015

Phys. Status Solidi C

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Designing a microfabrication process for lab-on-a-chip systems can at times be challenging, and the need to integrate a chemical surface modification reaction into this process can limit the options. Therefore, a robust set-up and protocol for the gas phase modification has been developed that can be variably integrated into microfabrication processes. The main improvement compared to similar methods is, besides easy and versatile sample handling, the integration of a continuous argon flow percolating through the liquid organosilane, and impinging directly the surface to be modified. This measure reduces the argon consumption drastically compared to current reaction schemes, while keeping short reaction periods.Silicon substrates were modified using 3-mercaptopropyltrimethoxysilane (MPTMS) and 3-aminopropyltrimethoxysilane (APTMS), thoroughly studied for different reaction stages, and compared to surfaces modified via a common solvent-based procedure from isopropanolic solution. Water contact angle measurements, infrared spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy verified the successful deposition of the alkylsilane. Additionally, silicon nanowires were assembled, exemplary for a lab-on-a-chip system, in a liquid gate field-effect-transistor configuration, and electrically characterized. The devices showed the expected response to applied liquid gate potentials before and after the modification and exhibited characteristic changes in the transconductance curve.

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Section: Surface Analysismentioning

confidence: 99%

Gas phase silanization for silicon nanowire sensors and other lab‐on‐a‐chip systems

Steinbach

Sandner

Mizaikoff

et al. 2015

Phys. Status Solidi C

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“…Several approaches to prepare ordered periodic arrays of nanoparticles which give SERS with good reproducibility and stability have been described. [15][16][17] Recently, a new type of nanostructured surface with nanocavities has been engineered by Bartlett et al [18][19][20][21][22][23] Nanostructured surfaces result in SERS substrates that can have finely tuned plasmon resonances, and which exhibit uniform enhancement over large areas, providing greater reproducibility for quantitative studies. [18,24] Such substrates have recently been employed to investigate flavins [25] and as a tool to discriminate mutations in DNA sequences.…”

Section: Introductionmentioning

confidence: 99%

SERS of β‐Thioglucose Adsorbed on Nanostructured Silver Electrodes

et al. 2010

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Highly ordered microporous films of silver-containing regular arrays of spherical pores of differing diameters were prepared by electrochemical deposition into the interstitial spaces of a template formed by nanosphere lithography. These nanostructured electrodes in conjunction with a Raman microprobe spectrometer were used to obtain surface-enhanced Raman spectra (SERS) of beta-thioglucose (beta-TG) under potential control. The SERS results were compared with SERS of beta-TG on an electrochemically roughened silver electrode surface. The bands in the experimental spectra were assigned to particular vibrations with the help of ab initio predictions of the spectra. The results of this study show that beta-TG self-assembled at a silver electrode forms a hydrophilic film that may be used in biomimetic research to enhance interactions between the electrode and the hydrophilic portion of a model membrane, and to prevent interactions of proteins inserted into this membrane with the metal surface. However, in contact with the aqueous electrolyte an anomerization reaction takes place and the beta-TG film is a mixture of the alpha- and beta-anomers of thioglucose. A partial oxidation of the self-assembled molecules was also observed. In addition, the orientation of the adsorbed molecules changes as a function of the applied potential.

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“…Many efforts have been done recently to develop a range of strategies based on electrostatic interactions [18][19][20][21][22][23][24][25][26], biomolecular recognition [27][28][29] and covalent coupling [18,[30][31][32][33][34]. By varying the surface density of ionic sites which can be used as binding sites for metallic ions it may be possible to control the density and size of metal particles as well as to prevent the agglomeration of metal particles at the electrode surface [35].…”

Section: Introductionmentioning

confidence: 99%

Metallic and bimetallic Cu/Pt species supported on carbon surfaces by means of substituted phenyl groups

Vilà

Brussel

D’Amours

et al. 2007

Journal of Electroanalytical Chemistry

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Investigation of structure and chemical states of self-assembled Au nanoscale particles by angle-resolved X-ray photoelectron spectroscopy

Cited by 46 publications

References 35 publications

Gas phase silanization for silicon nanowire sensors and other lab‐on‐a‐chip systems

Gas phase silanization for silicon nanowire sensors and other lab‐on‐a‐chip systems

SERS of β‐Thioglucose Adsorbed on Nanostructured Silver Electrodes

Metallic and bimetallic Cu/Pt species supported on carbon surfaces by means of substituted phenyl groups

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