Fabrication and Characterization of a Poly (3-Hexylthiophene) Thin Film Micro-sensor for Hypergolic Vapor Detection

2006 ◽  
Vol 951 ◽  
Author(s):  
Huihua Shu ◽  
Jiehui Wan ◽  
John Shu ◽  
Hong Yang ◽  
Bryan A. Chin
Keyword(s):  
Thin Film ◽  
Thermal Stability ◽  
Low Cost ◽  
Vapor Detection ◽  
Different Temperatures ◽  
Micro Sensor ◽  
Low Levels ◽  
Manufacturing Techniques ◽  
Microelectronic Manufacturing

ABSTRACTA passive chemiresistor micro-sensor was investigated for the detection of hydrazine compounds. Hydrazine compounds are a highly toxic and carcinogenic species exhibiting toxic effects in humans at very low levels of exposure. Therefore, a sensor capable of detecting ppb levels of hydrazine compounds is required to insure the safety of personnel. The present study describes the fabrication, testing, and characterization of a low-cost, ultrasensitive Poly (3-Hexylthiophene) (P3HT) thin film-based micro-sensor for the detection of hydrazine compounds. Standard microelectronic manufacturing techniques were used to form a micro-sensor composed of a silicon substrate, interdigitated gold electrodes, and P3HT sensing film. Responses of the micro-sensor to hydrazine compounds at different temperatures and concentration levels are reported. When exposed to 25 ppm hydrazine in nitrogen, the sensor's resistance was measured to change from a few ohms to over 10 Megaohms. The thermal stability of the P3HT micro-sensor and the method to improve thermal stability are also explored. Thermally annealing the P3HT micro-sensor was found to improve thermal stability at high temperatures. Moreover, the sensor exhibits good specificity to hydrazine and does not respond to the presence of NO2 and/or N2O.

ChemInform Abstract: Synthesis and Characterization of Cu(InxB1-x)Se2 Nanocrystals for Low-Cost Thin Film Photovoltaics.

ChemInform ◽  
2011 ◽  
Vol 42 (28) ◽  
pp. no-no
Author(s):  
Lin-Jer Chen ◽  
Jiunn-Der Liao ◽  
Yu-Ju Chuang ◽  
Yaw-Shyan Fu
Keyword(s):  
Thin Film ◽  
Low Cost ◽  
Synthesis And Characterization ◽  
Thin Film Photovoltaics

Influence of Thermal Annealing on Structural and Optical Properties of Sb Doped ZnTe Thin Film

2020 ◽  
Vol 12 (1) ◽  
pp. 100-104 ◽  
Author(s):  
Neha Pandey ◽  
Brijesh Kumar ◽  
D. K. Dwivedi
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Heating Temperature ◽  
Annealed Film ◽  
Defect States ◽  
Thermal Evaporation Method ◽  
Different Temperatures ◽  
Film Alloy ◽  
Prepared Alloy

Paper presents the influence of thermal treatment on structural and optical characteristics of Sb0.5ZnTe thin film. Alloy of Sb0.5ZnTe has been prepared through traditional and economical melt quenching technique and thin films of prepared alloy was deposited onto glass substrate by thermal evaporation method at pressure of 10–6 Torr. The antimony doped films were annealed for 2 h at three different temperatures ranges (373 K, 393 K and 413 K). Structural characterization of as prepared and annealed film was done by XRD technique and it was found that annealing improves the film crystal structure. UV-Vis spectrophotometer facilitates optical analysis of Sb0.5ZnTe film in wavelength range of 400–1000 nm. It was observed that band gap Eg of the Sb doped film increased while absorption coefficient (α) decrease with increase in heating temperature. These changes in optical properties were explained in terms of defect states.

Vacuum Foaming of Aluminum Scrap

2012 ◽  
Vol 1481 ◽  
pp. 83-88
Author(s):  
J. A. Garabito ◽  
H. Granados ◽  
V. H. López ◽  
A. R. Kennedy ◽  
J. E. Bedolla
Keyword(s):  
Automotive Industry ◽  
Vacuum Chamber ◽  
Low Cost ◽  
Porous Structures ◽  
Aluminum Foams ◽  
Casting And Solidification ◽  
Different Temperatures ◽  
Different Levels ◽  
Al Foams

ABSTRACTIn this study, scrap from the automotive industry was used to produce aluminium foams under vacuum. Chips of an aluminium alloy LM26 were melted and 1wt. % of Mg was added for creating a viscous casting with uniform distribution of oxides. An ingot was obtained of this alloy after casting and solidification. Trials for foaming this alloy were performed by re-melting pieces under vacuum at different temperatures. A window in the vacuum chamber allowed observation of the foaming and collapse of the porous structures was observed during cooling. Characterization of the aluminum foams revealed different levels of expansion, porous structures and degrees of drainage. The best foams were obtained at 680 °C with a density of 0.78 g/cm3. This technique appears to be a feasible low cost route for producing Al foams based on scrap material.

scholarly journals Characterization of drop-casted graphene/cellulose thin film on printing paper substrate

2020 ◽  
Vol 19 (2) ◽  
pp. 680
Author(s):  
Amirul Hadi Azmi ◽  
Shaharin Fadzli Abd Rahman ◽  
Mastura Shafinaz Zainal Abidin
Keyword(s):  
Thin Film ◽  
Sheet Resistance ◽  
Low Cost ◽  
Cellulose Solution ◽  
Wearable Electronics ◽  
Paper Substrate ◽  
Paper Electronics ◽  
Printing Paper ◽  
Printing Papers

Paper electronics is an emerging technology to implement flexible and wearable electronics devices via ink printing process. This paper evaluates the feasibility of using conventional printing paper for coating process with graphene/cellulose ink. 4 different types of regularly used conventional printing papers were used as substrates in this work. The conductive graphene ink was prepared through exfoliation of graphite in cellulose solution. The paper substrates surface morphology and sheet resistance of the drop-casted conductive ink on each paper were analyzed and discussed. Glossy paper was found to be suitable paper substrate for the printing of the formulated ink due to its low surface roughness of 16 nm. The value of sheet resistance of the graphene/cellulose thin film can be lowered to 4.11 kΩ/sq by applying multiple drops. This work suggests that conventional printing paper may offer solution for highly scalable and low-cost paper electronics.

scholarly journals High Performance P-Type Perovskite Lagao3 Thin Film Field Effect Transistor Prepared by Solution-Processed

2022 ◽  
Vol 2152 (1) ◽  
pp. 012008
Author(s):  
Qian Chen
Keyword(s):  
Thin Film ◽  
High Performance ◽  
Low Cost ◽  
Thin Film Transistor ◽  
Solution Process ◽  
Hole Mobility ◽  
Oxide Semiconductor ◽  
Future Design ◽  
Different Temperatures ◽  
P Type

Abstract Metal oxide semiconductor (MOS) is essential to compose high-performance electronic devices, however, the investigation on p-type MOS is relatively rare compared with its n-type counterpart. In this work, LaGaO3 thin films with superior p-type conductivity have been prepared via a facile solution process. Moreover, we have implemented Al2O3 and SiO2 as the dielectric of the p-channel LaGaO3 thin film transistors (TFTs) annealed at different temperatures. Particularly, the LaGaO3/Al2O3 TFTs annealed at 700 °C exhibit an ultrahigh hole mobility of 12.4 cm2V-1s-1, Under the same conditions, LaGaO3/Al2O3 thin film transistor is two orders of magnitude higher than LaGaO3/SiO2 thin film transistor. The advanced p-type characteristics of the LaGaO3 thin film, along with its facile low-cost fabrication process can shed new light on future design of high-performance complementary MOS circuit with other optimized facile-integrated dielectrics.

scholarly journals Characterization of Eggshell: A Heterogeneous Catalyst in Transesterification of Sand Apple (Parinari polyandra) Seed Oil

2021 ◽  
Vol 25 (7) ◽  
pp. 1179-1185
Author(s):  
O.O. Oniya ◽  
A. Saleh ◽  
F.B. Akande ◽  
D.T. Adeyemi
Keyword(s):  
Heterogeneous Catalyst ◽  
Ethyl Ester ◽  
Reaction Temperature ◽  
Low Cost ◽  
Biodiesel Production ◽  
Increase With Increase ◽  
Solvent Extraction Method ◽  
Different Temperatures ◽  
Apple Fruits

The objective of this study was to characterize a low cost heterogeneous catalyst from the transesterification of sand apple (Parinari polyandra B.) biodiesel. Sand apple fruits were processed and oil was extracted using solvent extraction method. Raw eggshells were calcined at 800°C for 120 min in the muffle furnace. Surface properties of the raw and calcined eggshell were characterized using Fourier Transformed Infrared Radiation (FTIR) and X-Ray Fluorescence (XRF). Transesterification of the Sand Apple Oil (SASO) with ethanol in the presence of the calcined catalyst to produce ethyl ester and glycerol were optimized using Central Composite Design at different temperatures and time. Reactants for the transesterification process were the raw SASO and anhydrous ethanol. The study shows that raw eggshell was more stable with hydrogen bond form at 2,724 cm-1an while oil yield of 53.13 % was obtained from sand apple kernels. Ethyl ester yield of 90% was obtained from SASO. The results of transesterification shows the maximum biodiesel yield of 90% was obtained at reaction temperature of 65°C and time of 120 min, while the minimum yield of 70% was obtained at temperature of 55°C and time of 60 min; indicating that biodiesel increase with increase in time. Similarly, yield of ethyl ester of SASO also increased when the reaction temperature increased. The percentages of biodiesel yield obtained from SASO transesterification in this study showed that sand apple is promising oil for biodiesel production as compared with other vegetable oil crop obtained in previous studies

scholarly journals Morphological and structural characterization of oxidized La-Si sputtered thin films

2008 ◽  
Vol 14 (S3) ◽  
pp. 81-84 ◽  
Author(s):  
J.C. Oliveira ◽  
A. Cavaleiro
Keyword(s):  
Thin Film ◽  
Magnetron Sputtering ◽  
Structural Changes ◽  
Low Cost ◽  
Ohmic Drop ◽  
Cell Components ◽  
Anionic Species ◽  
Si Films ◽  
High Level

High temperatures in Solid Oxide Fuel Cells (SOFCs) place stringent requirements on the cell components materials which result in high material costs for interconnects and insulation and cause the degradation of the system. The development of Intermediate Temperature SOFCs (IT-SOFCs) will require electrolyte materials with higher ionic conductivity at moderate temperatures than the conventional yttria-stabilised zirconia (YSZ). Recently, lanthanum silicates with an apatite-like structure (La9,33Si6O26) have attracted considerable interest as potential materials for low cost electrolyte. Some of these materials show conductivities at 875 K comparable to, or better than, YSZ; their high level of oxide ion mobility was related to the presence of oxygen channels along the c axis which facilitate the diffusion of the anionic species (O2− for SOFCs applications). Another way to fulfil IT-SOFCs requirements is to decrease the electrolyte thickness to the micrometer range and, therefore, the ohmic drop at the electrolyte. Magnetron sputtering has already been used to synthesize thin film electrolytes for SOFCs owing to its versatility for depositing complex materials as well as its ability to control their composition and morphology. The manufacturing of thin film lanthanum silicate electrolytes by magnetron sputtering, with thicknesses in the micrometer range, can be achieved through the previous deposition of La-Si films and subsequent thermal oxidation. The present study focuses on the characterization of the morphological and structural changes upon oxidation of La-Si films deposited by magnetron sputtering.

Synthesis and Characterization of CIS Nanoparticle Ink for Low-Cost Thin Film Solar Cells

2014 ◽  
Vol 14 (12) ◽  
pp. 9279-9284
Author(s):  
Joongpyo Shim ◽  
Jae-Sub Hahn ◽  
Soo-Ho Lee ◽  
Jaehyeong Lee
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Low Cost ◽  
Thin Film Solar Cells ◽  
Synthesis And Characterization ◽  
Nanoparticle Ink

Effect of heat treatment on the mechanical properties of jute yarns

2021 ◽  
pp. 002199832199910
Author(s):  
Y Ben Smail ◽  
A El Moumen ◽  
A Imad ◽  
F Lmai ◽  
M Ezahri
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Low Cost ◽  
Thermo Gravimetric Analysis ◽  
Natural Fibers ◽  
Young Modulus ◽  
Effect Of Temperature ◽  
Gravimetric Analysis ◽  
Jute Fibers ◽  
Different Temperatures

In the last two decades, an increasing interest has been observed for the use of natural fibers such as jute fibers in different applications. These fibers are characterized by their low cost and their availability. They are mainly used in fabric bag manufacturing. The objective of this paper is to study the effect of temperature on the mechanical properties of jute yarns. An experimental study was conducted at different temperatures (22 °C; 80 °C; 105 °C and 150 °C) for 24 h. Each degree was followed by tensile testing of the specimen. Besides, the thermo-gravimetric analysis (TGA) was used to investigate the effect of the temperature on the thermal stability and the thermal degradation of the jute fibers. In addition, the statistical analysis was performed using the method of two and three-parameter Weibull distribution to determine the spatial distribution of the properties. The results showed that there was a degradation of the mechanical properties of the jute yarns heated to high temperature compared to the raw yarns (considered as a specimen exposed to 22 °C). The tensile strain and the Young modulus failed by 36% and 13% respectively for the specimens heated at 150 °C and the failure kinematic of the jute fiber was affected by the temperature of heating. The TGA showed that the thermal stability of the jute yarns was affected by two factors: fibers drying and their changing temperatures.

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