Photochemical Micro-pattern Substitution of Functional Groups for Protein Attachment Control

2006 ◽  
Vol 950 ◽  
Author(s):  
Masataka Murahara ◽  
Yuji Sato
Keyword(s):  
Absorption Coefficient ◽  
Excimer Laser ◽  
Area Ratio ◽  
Water Contact ◽  
Oh Groups ◽  
Excimer Lamp ◽  
Micro Pattern ◽  
Pmma Surface ◽  
Modified Surface ◽  
Arf Excimer Laser

ABSTRACTHydrophilic and hydrophobic groups were selectively incorporated on the poly(methyl methacrylate) [PMMA] surface using a Xe2 excimer lamp and ArF excimer laser. With this new technique, a protein adsorption on the PMMA surface can be controlled.PMMA was firstly irradiated with a Xe2 excimer lamp in the presence of perfluoropolyether [PFPE] liquid layer to incorporate CF3 groups, and secondly, the PMMA surface was irradiated by an ArF excimer laser through a patterned reticle in the presence of water to incorporate OH groups or NH2 groups in an ammonia gas ambience. The area ratio of hydrophilic and hydrophobic of the modifying sample was made to 1:3, 1:1, and 3:1. The results showed that the fibrin absorption on the sample with hydrophilic and hydrophobic micro domains depended on the area ratio of the hydrophilic and hydrophobic. The absorption coefficient of the amide band remarkably decreased with increase in water contact angle. Furthermore, it was confirmed that the absorption coefficient of fibrin decreased as the interval of CF3 and OH or NH2 groups was narrowed from 250 to 20 μm, and the fibrin sticking on the modified surface with the 20 μm hydrophilic and hydrophobic micro domains was reduced to one-twenty of that on the untreated sample.

Open Air Fabrication of Al2O3 Thin Films at Room Temperature

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Okamoto ◽  
K. Toyoda ◽  
M. Murahara
Keyword(s):  
Excimer Laser ◽  
Pure Aluminum ◽  
Fused Silica ◽  
Active Oxygen ◽  
Aluminum Substrate ◽  
Entrance Window ◽  
Excimer Lamp ◽  
Before And After ◽  
Modified Surface ◽  
Fused Silica Glass

ABSTRACTA thin layer of water or hydrogen peroxide solution, which was formed on a pure aluminum substrate, was photodissociated by ArF excimer laser( λ =193nm) or Xe2* excimer lamp (λ = 172nm) light to photochemically oxidize the surface of aluminum substrate. The layer was formed by a capillary phenomenon between the substrate and a fused silica glass as an entrance window of ultraviolet light. Then, the layer was photodissociated by the excimer laser or the excimer lamp light irradiation to generate active oxygen; the surface oxidization was performed by the photo-induced active oxygen. The surface before and after modification was evaluated by the XPS analysis; the high densed photo-oxidization film was confirmed on the modified surface, compared with a natural oxidization film Furthermore, the contact angle with water became remarkably small, and it is seen that the treated surface was quite densely oxidized.

Patterned ZnS Thin-Film Growth using KrCl Excimer Lamp on the Zn Nuclei

1999 ◽  
Vol 585 ◽  
Author(s):  
M. Toda ◽  
H. Lizuka ◽  
M. Murahara
Keyword(s):  
Thin Film ◽  
Excimer Laser ◽  
Film Growth ◽  
Thin Film Growth ◽  
Single Shot ◽  
Si Substrate ◽  
Excimer Lamp ◽  
Arf Excimer Laser

AbstractPatterned Zn nuclei were formed by exposure with a single shot of an ArF excimer laser through a patterned photo mask onto a Si substrate which adsorbed DMZ (dimethylezinc). A ZnS thin film was then grown only onto the patterned Zn nuclei by KrCl excimer lamp irradiation of the substrate which was sealed in the chamber along with DMZ and H2S.

Arf Excimer Laser and Xe2· Excimer Lamp Induced Photochemical Fluorination of Polyimide Film

1998 ◽  
Vol 544 ◽  
Author(s):  
T. Ikegame ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
Chemical Composition ◽  
Excimer Laser ◽  
Water Repellency ◽  
Polyimide Film ◽  
Dangling Bond ◽  
Weak Point ◽  
Excimer Lamp ◽  
Chemically Modified ◽  
Arf Excimer Laser

AbstractOnly one weak point of all aromatic group polyimide surface was changed to water repellency. Polyimide surface was photo-chemically modified to be fluorinate with ArF excimer laser and Xe2 · excimer lamp irradiation. To promote the photo- chemical reaction, Xe2· excimer lamp was employed to produce CFn. radical from CF4 gas. Simultaneously, ArF excimer laser was irradiated on the polyimide surface to dissociate C-H bond. Dangling bond of C was reacted with CF, radical and produced C-CF, on the polyimide surface. By this modification, polyimide surface was changed to water repellency. As a result, polyimide surface was photo-chemically modified to fluorinate with CF4 gas pressure of 100Torr, the Xe2 excimer lamp of 7mW/cm2, and the ArF excimer laser of 30mJ/cm2, 10Hz and 3000shots, the contact angle with water was 134 degrees. And chemical composition of the photo-modified polyimide surface was inspected by ATR-FTIR spectra measurement.

Use of an Excimer Lamp for Photochemical Resistless Etching of Thermal Silicon Oxide Substrate

1995 ◽  
Vol 397 ◽  
Author(s):  
N. Kamata ◽  
M. Murahara
Keyword(s):  
Excimer Laser ◽  
Decomposition Method ◽  
Silicon Oxide ◽  
Etching Depth ◽  
Excimer Lamp ◽  
Oxide Substrate ◽  
Arf Excimer Laser ◽  
Krf Excimer Laser ◽  
Decomposition Efficiency

ABSTRACTPhotochemical resistless etching was carried out by using a Xe2* excimer lamp and a KrF excimer laser. The decomposition method with Xe2* excimer lamp increases the decomposition efficiency by 100 times than that of using ArF excimer laser and etchant gas, CHClF2. Xe2* excimer lamp irradiation allowed decomposition of CHClF2 gas to produce CF2 radical with a small quantity of gas. The CF2 radical was polymerized to form fluorocarbon layer on the SiO2 substrate. Simultaneously, circuit patterned KrF excimer laser was vertically irradiated the fluorocarbon layer on the substrate for resistless etching. The etching depth was about 1,000Â.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

scholarly journals Ag-Functionalized Si Nanowire Arrays Aligned Vertically for SERS Detection of Captured Heavy Metal Ions by BSA

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 685
Author(s):  
Ai-Huei Chiou ◽  
Jun-Luo Wei ◽  
Ssu-Han Chen
Keyword(s):  
Heavy Metal ◽  
Raman Scattering ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Great Promise ◽  
Ag Nps ◽  
Water Contact ◽  
Oh Groups ◽  
Si Nanowire

A novel surface-enhanced Raman scattering (SERS)-based probe to capture heavy metal ion (Zn2+) by bovine serum albumin (BSA) using Si-nanowire (SiNW) arrays with silver nanoparticles (AgNPs) was developed. A layer with AgNPs was deposited on the SiNW surface by RF magnetron sputtering for enhancement of SERS signals. Using a high-resolution transmission electron microscope (HRTEM), the observation reveals that the AgNP layer with depths of 30–75 nm was successfully deposited on SiNW arrays. The Ag peaks in EDS and XRD spectra of SiNW arrays confirmed the presence of Ag particles on SiNW arrays. The WCA observations showed a high affinity of the Ag–SiNW arrays immobilized with BSA (water contact angle (WCA) = 87.1°) and ZnSO4 (WCA = 8.8°). The results of FTIR analysis illustrate that the conjugate bonds exist between zinc sulfate (ZnSO4) and –OH groups/–NH groups of BSA. The resulting SiNWs/Ag NPs composite interfaces showed large Raman scattering enhancement for the capture of heavy metal ions by BSA with a detection of 0.1 μM. BSA and ZnSO4 conjugations, illustrating specific SERS spectra with high sensitivity, which suggests great promise in developing label-free biosensors.

Characterization of GaAs surfaces treated with phosphine gas photodecomposed by an ArF excimer laser

1998 ◽  
Vol 72 (12) ◽  
pp. 1472-1474 ◽  
Author(s):  
Takashi Sugino ◽  
Hideaki Ninomiya ◽  
Junji Shirafuji ◽  
Koichiro Matsuda
Keyword(s):  
Excimer Laser ◽  
Arf Excimer Laser
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