Graphene-polymer nanocomposites have attracted some attentions from researchers recently due to its potential applications as a stress sensor or a lightweight-flexible conductor. A series of atomistic molecular dynamics simulations were performed for the systems consisting of a graphene flake within 4-mer isoprene matrix to assess the conformational order of isoprene molecules at the...
Kitthipong Thana$^1$ and Rawat Jaisutti$^1$$^*$
$^1$ Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, Thailand.
Email: jrawat@tu.ac.th
In this research, the incorporating of cobalt phthalocyanine (CoPc) absorption layer on amorphous indium-gallium-zinc oxide transistor was proposed to enhance a broad spectral and responsivity of photodetector from...
High efficiency CuIn$_\text{1–x}$Ga$_\text{x}$Se$_2$ (CIGS) thin film solar cells are usually deposited on Mo-coated soda-lime glass (SLG) substrates by the three-stage co-evaporation process which is intended to create double-graded band gap. It requires short total deposition time and changing of substrate temperature in order to obtain the double-graded band gap which is quite difficult for...
In this work, CuOx/SnO2 nanostructures were synthesized by a microwave-assisted thermal oxidation. Mixture of Sn and Cu2O with various ratio was loaded into a cylindrical quartz tube and further radiated in a microwave oven under atmospheric ambient. The as-synthesized products were characterized by transmission electron microscope and x-ray diffractometer. The results showed that CuOx/SnO2...
The effect of the synthesized zinc oxide nanoparticles (sZnO) and calcium carbonate nanoparticles (NCC) on the cure characteristics and mechanical properties of natural rubber were investigated. The sZnO synthesized by microwave assisted aqueous precipitation method using zinc nitrate hexahydrate and sodium hydroxide as a precursor. The morphology of the sZnO is a spherical shape with the...
Methyl ammonium lead iodine CH$_3$NH$_3$PbI$_3$ based perovskite with low degree of disorder is of great interest for optoelectronic and photovotaic applications.In this work, a layer of CH$_3$NH$_3$PbI$_3$ has been successfully deposited on fluorine doped tin oxide (FTO) coated on glass by an ultrasonically sprayed-nebulous method. Changes in their structural and optical properties along with...
Herein, polycrystalline of cesium (Cs) doped in formamidinium lead triiodide (HC(NH$_2$)$_{2}$PbI$_{3}$ or FAPbI$_{3}$) films were successfully prepared by spin-casting from solutions. Changes in structural, optical and morphological properties of the obtained films upon varied Cs concentrations were systematically investigated. A phase stability and the grain sizes of the films are very...
Abstract
This research studied the effects of PVP and PEG on morphology, hydrophilicity and mechanical properties of the PSF/NH2-SiO2 composite membranes. To study the chemical and physical properties, pure polysulfone (PSF) and nanocomposite PSF/NH2-SiO2 membranes were prepared. PVP and PEG at different loading were incorporated into the matrix of PSF membranes. Phase inversion technique was...
Abstract. We reported the humidity sensor free catalyst prepared from shrimp and egg shell. The annealed shrimp and egg shell were ground to be powder and mixed together with various ratios. The samples were characterized and investigated by X-ray diffraction technique (XRD), Scanning electron microscope (SEM) and humidity sensing. Therefor, XRD pattern of shrimp and egg shell show chitosan...
Abstract
High purity nano-silica xerogel was synthesized from rice straw ash that is a residue materials from agriculture. To obtain the rice straw ash for preparing of sodium silicate that is then used as silica source, pretreated rice straw was burned at 600-900 oC. Rice straw ash was reacted with 0.5 M NaOH for 3-12 h and filtrated by a no.41 filter to prepare sodium silicate. Afterwards,...
Banana is a typical fruit in Southeast Asia which has value in addition to being a food Source. Agricultural and plantains processing industries generate enormous amount of waste in the form of banana peel. It is renewed that banana peel has several forms of biomass resources exist (such as starch or sugar crops, weeds, and oils plants, etc.) which can utilize for reducing agent in chemical...
ZnO(Al) thin films were prepared by asymmetric bipolar dc magnetron sputtering technique as the transparent electrode for solar cell. ZnO(Al) target was prepared at the surface ratio ZnO:Al of 45 : 1. ZnO(Al) thin films were grown by the deposition time of 10, 20, 30, 40 and 50 minutes, respectively. Moreover, growth of ZnO(Al) thin films the deposition time for 30 minutes was doped by N2 gas...
The issue of contact resistance between graphene and metal contacts is crucial in the development of high-speed graphene devices. However, fabrication-related contamination severely affects the contact resistance in graphene and hence an effective post-fabrication method is needed to resolve this problem. Current-induced cleaning has previously been used successfully to clean the surface of...
Layers of polycrystalline molybdenum trioxide (MoO$_3$) thin films were successfully deposited on fluorine-doped tin oxide (FTO) coated glass by a spray pyrolysis technique at the deposition temperature of 425°C for 1 hour. The prepared films were further annealed at 500 $^o$C for 0.5, 1, 1.5, 2 and 3 hours. The effect of the annealing periods of time on their structural, morphological and...
We reported a novel method to align spherical nanogolds into linear chains, mediated by induced-electric dipoles from carbon nanotubes in the suspension under AC field. Nanogolds were suspended along with carbon nanotube in water under an AC field of magnitude 100 volts/mm and frequency range of 25 - 1,000 KHz. Typically the electric polarization of nanoparitcles are very small because of...
Zine oxide nanostructures are of eminent importance for the field of chemical sensors, field effect transistors, transparent conductors and ultraviolet light emitting devices. Work in this project is focused on the synthesis and characterization of nanorods and nanoparticles of zine oxide (ZnO) by precipitation method. The morphology of the samples can be controlled by adjusting the amount of...
Recently, monolayer of ZnO has successfully been synthesized on graphene. It leads to a new class of 2D oxide materials which have many promising properties such as high optical transparency, hazard gas capture etc. To improve to use in a spintronic application, Mn is doped into ZnO by many previous studies. Here, this study aims at investigating stability, electronic and magnetic properties...
Surface improvement of stainless steel (AISI 316L) by coating films for biomedical application was investigated. The DLC, TiN and TiCN films were deposited using Physical Vapor Deposition (PVD) technique. The structure of DLC film was analyzed using Raman spectroscopy. The composition of the films was measured using energy dispersive X-ray spectroscopy. The contact angle of the films was...
Abstract
This study aims to investigated the synthesis of single-phase nano-titanium using titanium (IV) isopropoxide (TTIP) as a precursor and two types of surfactant as structure directing agent or template; CTAB and TTAB. Double-phase and co-condensation techniques are employed for the synthesis. The formation of titanium nanoparticles occurs at about 60-80 oC under atmospheric pressure...
Abstract. The flower-like nanostructures of SnO$_2$ were successfully synthesized by a simple hydrothermal method. The structure of the flower-like samples was investigated by X-ray diffraction (XRD). The samples revealed the single phase of SnO$_2$ tetragonal structure. The corresponding selected-area electron diffraction (SAED) analysis further confirmed the formation of the tetragonal...
The objective of this research was to study the influence of surface preparation by laser process on the properties of DLC Film coated on Stainless steel 316L samples. The parameters of surface preparation included laser power and laser speed were set at 3 levels. The treated sampled was coated by DLC films at 500 nm film thickness. Average surface roughness was measured by Surface roughness...
Perovskite thin films $CH_3NH_3PbCl_{3-x}Cl_x$ in this project are deposited by two-step deposition method to study the effect of chloride on the optical band gap. In this experiment, the band gap is insignificantly increased from 1.60 ± 0.01 eV with no Cl-doping to 1.62 ± 0.01 eV with 16% Cl-doping because some chloride ions cannot replace the iodide positions in $CH_3NH_3PbI_3$ and form...
Metal phthalocyanine (MPc) is a metal organic compound which can be formed with several metal atoms at the center. Although MPc has semiconductor property, in order to fabricate the selective electrode for cyclic voltammetry (CV) measurement,the other material with high electrical conductive materials is required to mix in order to achieve sufficient electrochemical current. In this work,...
This work aims to evaluate the use of concentrated sodium hydroxide solution to etch silicon (100) substrate under solution agitation by ultrasonic coupled with mechanical rotation for achieving vertical etched sidewall. Experimental trials were conducted by design of experiments with full factorial design. Factors considered here compose of; sodium hydroxide concentration, solution...
X-ray photoelectron spectroscopy (XPS) and x-ray absorption spectroscopy (XAS) were employed for the investigations of diamond-like carbon films prepared by HiPIMS technique. The measurements were done ex-situ, i.e. the prepared DLC samples were exposed to air during transferring from the deposition to analysis chambers. It is inevitable that the surface of the samples was contaminated by...
