Surface Functionalization of Silicon Oxide at Room Temperature and Atmospheric Pressure

Pavlovic, Elisabeth; Quist, Arjan P.; Gelius, U.; Oscarsson, Sven

doi:10.1006/jcis.2002.8565

Cited by 59 publications

(58 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our approach, the OH-modified TCO substrate was dipped into a solution containing 3-mercaptopropyl(trimethoxysilane) (MPTMS, 0.56 M) in ethanol at 295 K to create a thiol-functionalized silane SAM film on TCO. After this treatment, the contact angle of water on the TCO surface increased to 70.01, which is consistent with that reported in the literature (691), 25 thereby confirming the formation of a dense MPTMS monolayer on TCO.…”

Section: Resultssupporting

confidence: 91%

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

Tsai

et al. 2014

NPG Asia Mater

View full text Add to dashboard Cite

We report a two-step dip-coating approach for the fabrication of self-assembled monolayers of platinum nanocrystals (SAM-Pt) with a particle size of B3 nm and that are uniformly deposited on a transparent conducting oxide (TCO) surface to serve as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). In the first step, we prepared a polyol solution containing H 2 PtCl 6 and ethylene glycol at 110 1C, in which the reduction kinetics were controlled by adding various proportions of NaOH. In the second step, we immersed a thiol-modified TCO substrate into the polyol solution with monodispersed Pt nanoparticles prepared at pH 3.7 at approximately 295 K to complete the nanofabrication. The DSSC devices using Z907 dye as a photosensitizer and the CE prepared using this SAM-Pt approach attained notable photovoltaic performance (Z ¼ 9.2%) comparable with those fabricated using a conventional thermal decomposition method (Z ¼ 9.1%) or a cyclic electrodeposition method (Z ¼ 9.3%) under the same experimental conditions. We emphasize that the SAM-Pt films feature a clean surface, uniform morphology, narrow size distribution, small Pt loading and great catalytic activity; the present approach is hence not only suitable for DSSCs but also applicable for many other energy-related applications that require platinum as an efficient catalyst.

show abstract

Section: Resultssupporting

confidence: 91%

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

Tsai

et al. 2014

NPG Asia Mater

View full text Add to dashboard Cite

show abstract

“…Therefore, the silanization reaction may restrict the overall process design for labon-a-chip systems. Gas phase reactions do not interfere in this manner, but often appear inadequate in terms of gasor time-consumption [10,11]. Therefore, in order to find reaction conditions that address these issues and that allow flexible integration into a microfabrication process as the key technology for miniaturized biosensors and electronic devices, we developed an advanced gas phase reaction (GP) method.…”

Section: Introductionmentioning

confidence: 99%

“…More than a decade ago, Pavlovic et al published a straightforward method for modifying silicon surfaces at atmospheric pressure and room temperature [11]. The authors used a simple plastic centrifugation tube to direct an argon flow across a mercaptosilane (MPTMS) drop and then past a substrate surface.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…We use a gas-phase method based on Ref. 13 to modify the surface of the probe with 3-aminopropyltrimethoxysilane ͑APTMS; Tokyo Kasei Kogyo͒ molecules. Gas-phase preparations have been proven to produce better quality surfaces than liquid preparation.…”

mentioning

confidence: 99%

“…Gas-phase preparations have been proven to produce better quality surfaces than liquid preparation. 13,14 In short, a nitrogen flow of approximately 1 L/min was used to increase the evaporation rate of the silane molecules by lowering the partial pressure of the silane molecules in the gas phase above the liquid silane, at room temperature and atmospheric pressure. Thus, an increased number of molecules came into contact with the silicon oxide surface of the probe placed in the reactor.…”

mentioning

confidence: 99%

Selection and transfer of individual plasmon-resonant metal nanoparticles

Tanaka

Sasaki

2010

Applied Physics Letters

View full text Add to dashboard Cite

We present a simple method for selecting a single metal nanoparticle with desired localized surface plasmon ͑LSP͒ characteristics from particle ensembles on one surface and then transferring it to another surface. The LSP of individual nanoparticles is characterized using a microspectroscopy system. An atomic force microscope mounted on the optical microscope achieves particle capture and release with the chemically modified probe. © 2010 American Institute of Physics. ͓doi:10.1063/1.3304085͔Gold and silver nanoparticles typically exhibit strong optical resonance in the visible wavelength range due to collective oscillations of conduction electrons in the nanoparticles known as localized surface plasmon ͑LSP͒, 1 which has long fascinated scientists. The LSP not only gives the nanoparticle a specific color but also enables concentration of electromagnetic fields on the nanoscale, while enhancing local field strengths by several orders of magnitude. These give rise to a range of physically interesting and technologically important phenomena. These phenomena include surface enhanced Raman scattering ͑SERS͒, 2-4 fluorescence enhancement, 5 nanoscale lithography, 6,7 and nonlinear photochemical reactions. 8The LSP characteristics sensitively depend on particle size, shape, and dielectric environment. 1 For applications in nanooptics, there is a clear requirement for metal nanoparticles with optimized LSP characteristics. For example, the frequency of LSP resonance should match with the excitation wavelength, and the dephasing time T =2h/ ⌫ hom , where ⌫ hom is the homogeneous linewidth of the LSP resonance, of LSP excitation should be as large as possible. 9,10 In fact, the demand for optimized LSP performance is more critical in applications of single-molecule SERS.11,12 Consequently, much effort has recently been dedicated to the control of LSP characteristics. For this purpose, a large variety of particle sizes and shapes were obtained using chemical synthesis and electron beam lithography. However, the chemical fabrication approaches do not allow a perfect control of the particle geometry. On the other hand, the electron lithography method can produce nanoparticles having precise sizes and shapes on the substrate but it is not adaptable for substrate compositions that are easily changed or degraded in wet environments because this method includes a wet process.

show abstract

Surface Functionalization of Silicon Oxide at Room Temperature and Atmospheric Pressure

Cited by 59 publications

References 18 publications

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

Nanofabrication of uniform and stabilizer-free self-assembled platinum monolayers as counter electrodes for dye-sensitized solar cells

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

Selection and transfer of individual plasmon-resonant metal nanoparticles

Contact Info

Product

Resources

About