نتایج جستجو برای: polystyrene film
تعداد نتایج: 100465 فیلتر نتایج به سال:
We demonstrate glancing-angle deposition of gold on a nanostructured diblock copolymer, namely polystyrene-block-poly(methyl methacrylate) thin film. Exploiting the selective wetting of gold on the polystyrene block, we are able to fabricate directional hierarchical structures. We prove the asymmetric growth of the gold nanoparticles and are able to extract the different growth laws by in situ ...
The forces between a flat polystyrene film and a polystyrene sphere have been measured in water and solutions of KCl and KOH. All force–distance curves show at distances >5–50 nm an electrical double-layer repulsion whose range and strength depend on the electrolyte concentration. The electrical double-layer potential at the polystyrene surface coincides with its zeta potential. An attractive f...
The chemical modification of polystyrene through the deposition of a beam of polyatomic fluorocarbon ions (C3F5 and CF3) at experimental fluences is studied using classical molecular dynamics simulations with many-body empirical potentials. To facilitate these simulations, a new C-H-F potential is developed on the basis of the second-generation reactive empirical bond-order potential for hydroc...
We report chemical modification of self-assembled block copolymer thin films by ultraviolet light that enhances the block-selective affinity of organometallic precursors otherwise lacking preference for either copolymer block. Sequential precursor loading and reaction facilitate formation of zinc oxide, titanium dioxide, and aluminum oxide nanostructures within the polystyrene domains of both l...
In this study we investigated the influence of an organic polystyrene brush on the deposition of ZnO thin films under moderate conditions. On a non-modified SiO x surface, island growth is observed, whereas the polymer brush induces homogeneous film growth. A chemical modification of the polystyrene brushes during the mineralization process occurs, which enables stronger interaction between the...
We present a novel and simple method for patterning oxygen-sensitive polystyrene thin films and demonstrate its potential for integration with microfluidic lab-on-a-chip devices. Optical oxygen sensing films composed of polystyrene with an embedded luminescent oxygen-sensitive dye present a convenient option for the measurement of oxygen levels in microfluidic and lab-on-a-chip devices; however...
Whilst polystyrene microgels belong to the oldest family of microgel particles, their behaviours when deposited onto substrates or prepared as composites have received little attention. Because polystyrene microgels are solvent-swellable, and inherently colloidally stable, they are well suited to form composites with conjugated polymers. Here, we investigate the morphology and light absorption ...
1. Holey Silicon fabrication The HS ribbons used for transport measurements are patterned by optical lithography and then released from SOI substrate (Soitec Inc.) by hydrofluoric acid vapor etching. The SOI wafer consists 100 nm device layer (<100>, 14-22 Ω·cm, phosphorus doped) with 200 nm buried oxide layer. Holey structure is fabricated by DRIE through thin chromium mask (~5 nm) converted f...
In the investigation of chemical pollutants, such as PAHs (Polycyclic Aromatic Hydrocarbons) at low concentration in aqueous medium, Surface-Enhanced Raman Scattering (SERS) stands for an alternative to the inherent low cross-section of normal Raman scattering. Indeed, SERS is a very sensitive spectroscopic technique due to the excitation of the surface plasmon modes of the nanostructured metal...
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