Study the Effect of Chemical Treatment on Substrate Surface on the Formation Nanodots Array and its Optical Properties

2019 ◽  
Vol 889 ◽  
pp. 95-101
Author(s):  
Truong Duc Phuc ◽  
Yoshino Masahiko
Keyword(s):  
Chemical Treatment ◽  
Substrate Surface ◽  
Micro Structure ◽  
Dewetting Process ◽  
Sensing Applications ◽  
Peak Intensity ◽  
Acetone Treatment ◽  
Absorbance Peak ◽  
Structure Patterns ◽  
Peeling Off

In this research, an effective method to fabricate various metallic nanoand micro structure patterns is developed by combination of chemical stamping and selective peeling off technique. The feasibility of the process is experimentally studied and demonstrated. In this paper, the authors present the effects of the chemical treatment on the substrate surface on the formation of the nanodots array and its absorbance property. The results show that the chemical treatment by dropping Acetone solution on the quartz glass substrate strongly affects the morphology and absorbance property of the nanodots array. With the Acetone treatment on the substrate, the nanodots become smaller and more uniform in size through thermal dewetting process. Simultaneously, it results in blue shifted of the absorbance peak and enhancement of the absorbance peak intensity. The improvement of the optical property of the nanodots array is useful for plasmonic solarcell and bio sensing applications.

Morphological, Structural and UV Sensing Properties of Fe-Doped ZnO Nanorods

2015 ◽  
Vol 1109 ◽  
pp. 200-204 ◽  
Author(s):  
Q. Humayun ◽  
U. Hashim
Keyword(s):  
Uv Light ◽  
Substrate Surface ◽  
Zno Nanorods ◽  
Preferential Orientation ◽  
Crystalline Quality ◽  
Current Gain ◽  
Fe Doping ◽  
Current Time ◽  
Sensing Applications ◽  
Doped Zno

Iron (Fe) doped ZnO nanorods were synthesized on glass substrate using a sol-gel hydrothermal growth method by adopting various concentration ratios of 0.8 at% Fe, 1 at% Fe and 3 at% Fe respectively. The X-ray diffraction (XRD) analysis show that all the grown ZnO nanorods have a hexagonal wurtzite structure and are preferentially oriented along the c-axis perpendicular to the substrate surface. At 3 at% Fe-doping, the crystalline quality and the preferential orientation of ZnO nanorods are improved and below 3 at% Fe-doping concentration crystalline quality and the preferential orientation of ZnO nanorods is weakened in turn. The surface morphology analysis of the samples show that the ZnO nanorods are grown vertically to the substrate surface and highly interconnected. Such interconnected network will facilitates the electron transport along the nanorods axis. Current-voltage and current-time characterization under the exposure of UV light ON/OFF sates with exhibited excellent current gain of 1.12 and good response/recovery time of 30 and 10 s showed that the fabricated device can be used for UV sensing applications.

scholarly journals Coalescence of droplets on micro-structure patterned hydrophobic planar solid surfaces

RSC Advances ◽  
2017 ◽  
Vol 7 (39) ◽  
pp. 23954-23960 ◽  
Author(s):  
Guiping Zhu ◽  
Hui Fan ◽  
Hulin Huang ◽  
Fei Duan
Keyword(s):  
Surface Properties ◽  
Substrate Surface ◽  
Solid Surfaces ◽  
Liquid Droplets ◽  
Micro Structure

The motion and coalescence of sessile liquid droplets on patterned solid surfaces are investigated systematically in terms of the liquid and substrate surface properties.

scholarly journals Angle-Sensitive Photonic Crystals for Simultaneous Detection and Photocatalytic Degradation of Hazardous Diazo Compounds

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 93
Author(s):  
Kenichi Maeno ◽  
Bhargav R. Patel ◽  
Tatsuro Endo ◽  
Kagan Kerman
Keyword(s):  
Photonic Crystal ◽  
Photocatalytic Degradation ◽  
Incident Angle ◽  
Simultaneous Detection ◽  
Diazo Compounds ◽  
Dye Molecules ◽  
Peak Intensity ◽  
Sensitive Sensor ◽  
Absorbance Peak ◽  
Diazo Dyes

Congo Red (CR) and Amido Black 10B (AB-10B) are anionic diazo dyes, which are metabolized to produce a bioaccumulative and persistent carcinogen, benzidine. In this regard, an angle sensitive sensor composed of photonic crystal supported photocatalyst was fabricated for the simultaneous detection and photocatalytic degradation of diazo dyes from aqueous solutions. Reflectance spectroscopy was used in the detection of CR and AB-10B, which was based on the emergence of the incident angle dependent reflection peaks from the TiO2 coated two-dimensional photonic crystal (2D-PhC) surfaces and their subsequent quenching due to the presence of dye molecules whose absorbance peak intensity overlapped the reflection peak intensity of TiO2 at the respective angle. Interestingly, ultraviolet (UV) mediated photocatalytic degradation of CR and AB-10B was achieved using the same TiO2 coated 2D-PhC surfaces. 2D-PhC underneath the TiO2 layer was able to confine and localize the light on the TiO2 coated 2D-PhC surface, which enhanced the light absorption by dye molecules on the TiO2 surface and the photocatalytic efficiency in the degradation of CR and AB-10B. Finally, this proof-of-concept study demonstrated the fabrication of copolymer film based photonic crystal supported photocatalytic device, which can be used for developing miniaturized sensors competent in on-field detection and degradation of pollutants.

The Effect of Short and Long Range Interactions on Break up and Dewetting of Thin Polymer Films

1991 ◽  
Vol 248 ◽  
Author(s):  
Gtonter Reiter
Keyword(s):  
Average Distance ◽  
Substrate Surface ◽  
Liquid Films ◽  
Recent Theory ◽  
Thin Polymer Films ◽  
Dewetting Process ◽  
Thin Polymer ◽  
Long Range Interactions ◽  
Cylindrical Holes ◽  
Break Up

AbstractWe report investigations of instabilities of thin polystyrene films (< 100 nm). In the liquid state films break up by creating cylindrical holes. The average distance between holes is approx. proportional to the film thickness squared. This dependence compares well with the prediction of a recent theory on spinodal decomposition of thin liquid films. The subsequent dewetting process (=growth of holes) depends strongly on the composition of the substrate surface whereas the break up does not seem to be influenced by this surface. The importance of long and short range interactions in this context is discussed.

scholarly journals Mask-free three-dimensional epitaxial growth of III-nitrides

2020 ◽  
Vol 56 (1) ◽  
pp. 558-569
Author(s):  
Mariusz Rudziński ◽  
Sebastian Zlotnik ◽  
Marek Wójcik ◽  
Jarosław Gaca ◽  
Łukasz Janicki ◽  
...  
Keyword(s):  
Large Scale ◽  
Substrate Surface ◽  
Three Dimensional ◽  
Buffer Layers ◽  
Careful Examination ◽  
Growth Step ◽  
Sensing Applications ◽  
Growth Method ◽  
Aln Buffer ◽  
Novel Catalyst

Abstract A novel catalyst-free and maskless growth approach is presented to form an ordered geometrical array of three-dimensional (3D) AlGaN/AlN microrods. The growth method is composed of a single growth step using metalorganic vapor phase epitaxy, achieving microstructures with homogeneous diameters, shapes and sizes over relatively large scale (on 2-in. wafer). The 3D AlGaN/AlN heterostructures are grown in a form of micro-sized columns elongated in one direction perpendicular to the substrate surface and with a hexagonal cross section. A careful examination of growth steps revealed that this technology allows to suppress coalescence and lateral overgrowth, promoting vertical 3D growth. Interestingly, two distinct morphologies can be obtained: honeycomb-like hexagonal arrangement perfectly packed and with twisted microrods layout, by controlling strain state in AlN buffer layers. Consequently, 3D AlGaN microrods on tensile-strained AlN templates show a 0° twisted morphology, while on compressive-strained templated a 30° twisted arrangement. Moreover, the optical and crystalline quality studies revealed that the top AlGaN layers of the examined 3D semiconductor structures are characterized by a low native point-defect concentration. These 3D AlGaN platforms can be applied for light emitting devices or sensing applications. Graphic abstract

Failure Analysis of the outside Coating on the Furnace Roller

2016 ◽  
Vol 853 ◽  
pp. 431-435 ◽  
Author(s):  
Zheng Qu Feng ◽  
Lu Wang ◽  
Wei Ze Wang ◽  
Kai Di Cheng ◽  
Cheng Zhou Chen
Keyword(s):  
Failure Analysis ◽  
Substrate Surface ◽  
Low Carbon Steel ◽  
Substrate Material ◽  
Composition Analysis ◽  
Low Carbon ◽  
Hvof Spraying ◽  
Microstructure Observation ◽  
Oxygen Fuel ◽  
Peeling Off

A failure case of the outside coating on the furnace roller is presented in this study. The coating consists of WC-Co, which is deposited on 45 steel by High Velocity Oxygen Fuel (HVOF) spraying. The spalling of coatings has been found in the middle of the roller. Rust was also observed on the coatings of the roller. The failure analysis of the coating was performed in terms of composition analysis, and microstructure observation etc. In addition, the effects of different sandblasting post-treatments were compared. And the effect of substrate material is investigated on the corrosion of coatings. It was concluded that the sandblasting particles remained on the substrate surface have effects on the failure of the coating. The peeling-off coating on the roller is also related with the formation of iron oxides. Less sand can be remained on the substrate surface when air purging and brushing is used after the sand-blasting compared with air purging or non-treatment is applied. The stainless steel shows more excellent corrosion resistance than the low carbon steel when they are used as substrate for WC-Co coatings.

Effects of Morphology of Nanodots on Localized Surface Plasmon Resonance Property

2014 ◽  
Vol 8 (1) ◽  
pp. 74-82 ◽  
Author(s):  
Truong Duc Phuc ◽  
◽  
Masahiko Yoshino ◽  
Akinori Yamanaka ◽  
Takatoki Yamamoto ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Gold Film ◽  
Blue Shift ◽  
Localized Surface Plasmon ◽  
Peak Intensity ◽  
Absorbance Peak ◽  
Annealing Method

In this paper, authors report the effects of process parameters of thermal annealing method on the morphologyand Localized Surface Plasmon Resonance (LSPR) property of gold nanodots. Results show that the nanodots aggregated on a quartz glass substrate are large and sparse, while the nanodots aggregated on a silicon substrate are small and dense. The peak of the absorbance spectra is shifted to a longer wavelength and becomes broader when the gold film is thicker. The absorbance intensity increases with the increase in the gold film thickness. Increase the annealing temperature and/or the annealing time result in a blue shift of the absorbance peak and a decrease in the peak intensity. It is found that the variation in the absorbance peak wavelength and peak intensity closely correlates to the variation in the average circularity of the nanodots. This result suggests that the LSPR of nanodots can be tuned by controlling themorphology, specifically the circularity, of the nanodots.

Graphene/SiC Functionalization for Blood Type Sensing Applications

2018 ◽  
Vol 924 ◽  
pp. 909-912
Author(s):  
Sergey P. Lebedev ◽  
Alexander Usikov ◽  
Sergey Novikov ◽  
Eugenia Shabunina ◽  
Natalia M. Shmidt ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Cyclic Voltammetry ◽  
Substrate Surface ◽  
Electrochemical Process ◽  
Blood Type ◽  
Functionalized Graphene ◽  
Sensing Applications ◽  
Graphene Films

Functionalization of graphene/SiC dies by nitro-phenyl and its reduction to phenyl-amine is discussed. The graphene films were formed on a SiC substrate by the substrate surface thermal decomposition at 1800-2000°C. The functionalizing procedure included a two-step electrochemical process monitored by cyclic voltammetry and the die resistance. Functionalized graphene/SiC dies with applied antibody were blood sensitive and can be potentially applied to identify promptly types of the blood.

Electric Field Induced Carbon Nanostructures for Electronics and High Surface Areaapplications

2003 ◽  
Vol 776 ◽  
Author(s):  
Chao Hsun Lin ◽  
Shu Hsing Lee ◽  
Chih Ming Hsu ◽  
Ming Her Tsai ◽  
Cheng Tzu Kuo
Keyword(s):  
Electric Field ◽  
Field Emission ◽  
Carbon Nanostructures ◽  
Electron Cyclotron Resonance ◽  
Microwave Plasma ◽  
Substrate Surface ◽  
High Surface ◽  
Necessary Condition ◽  
Nano Structure ◽  
Sensing Applications

AbstractStrong influence of the applied or self-induced (i.e. self-biasing) electric field on the alignment, orientation and structures was found in the carbon nano-structure deposition process. This study applied microwave-plasma electron-cyclotron-resonance CVD (ECR-CVD) technique for carbon nano-structure deposition. The deposited structures and properties were characterized with SEM and field emission I–V measurements. The result shows that a negative dc bias applied on the substrate is a necessary condition. In this condition, all carbon nanostructures were well aligned and perpendicular to the substrate surfaces and independent to the plasma/gas flowing directions. Interestingly, when applied an additional electric field near the substrate surface by a guiding metal plate, the CNT growth direction could be manipulated from perpendicular to nearly parallel to the substrate surface. Moreover, a rattan-like CNT would form when prolonging the deposition time or increasing the plasma carbon concentration. These novel nanostructures are expected to have high potential in energy storage, field emission display, nanoelectronics and gas sensing applications accordingly.

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