scholarly journals Thermal Chemically Deposited Zno Nanostructures: Influence of Post-Deposition Annealing Temperature on Ph Sensor Performance

2018 ◽  
Vol 7 (3.11) ◽  
pp. 6
Author(s):  
Aimi Bazilah ◽  
Zaiki Awang ◽  
Shafinaz Sobihana Shariffudin ◽  
Sukreen Hana Herman
Keyword(s):  
Heat Treatment ◽  
Surface Morphology ◽  
Ph Sensor ◽  
Chemical Deposition ◽  
Annealing Treatment ◽  
Zno Nanostructures ◽  
Ph Sensing ◽  
Post Annealing ◽  
Annealing Heat Treatment ◽  
Post Deposition

Zinc oxide (ZnO) nanostructures were synthesized via thermal chemical deposition (TCVD) method and applied as the sensing membrane of an extended-gate field effect transistor (EGFET) pH sensor.  The ZnO nanostructures undergone a post-deposition heat treatment with the temperature ranging from 200-500 °C for 15 min in air ambient. The influence of the post-deposition heat treatment on the physical and pH sensing characteristics was investigated. The FESEM images showed that the surface morphology of the samples were dependent on post-annealing treatment. The as-deposited sample showed the biggest grain size and non-uniformed structures. Applying the post-annealing heat treatment caused the surface morphology to become denser and uniform. The most ideal temperature for the heat treatment for EGFET pH sensor application was found at 300 °C resulting in a pH sensitivity of 48.2 mV/pH with 0.9646 linearity.   

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

2010 ◽  
Vol 7 (9) ◽  
pp. 2286-2289 ◽  
Author(s):  
M. Zainizan Sahdan ◽  
M. Hafiz Mamat ◽  
M. Salina ◽  
Zuraida Khusaimi ◽  
Uzer M. Noor ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Surface Morphology ◽  
Treatment Effects ◽  
Zno Nanostructures

Cutting Performance of TiAlSiN Coated Cemented Carbide Tool with Post-Deposition Heat Treatment

2009 ◽  
Vol 79-82 ◽  
pp. 767-770 ◽  
Author(s):  
Wei Yu Ho ◽  
Chi Wei Chen ◽  
Da Yung Wang ◽  
Woei Yun Ho
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Protective Layer ◽  
Annealing Treatment ◽  
Nitrogen Atmosphere ◽  
Cutting Performance ◽  
Cutting Test ◽  
Coated Cemented Carbide ◽  
Tialsin Coating ◽  
Post Deposition

In this study, TiAlSiN coatings were synthesized by cathodic arc deposition with Ti and Al88Si12 dual cathodes. The as-deposited coatings were following with post-deposition heat treatment in air and nitrogen atmosphere, respectively, at the temperature of 400 oC for 3 hour. The annealing treatment of the TiAlSiN coating has an expected effect on the wear resistance and cutting performance. The TiAlSiN coating subjected to heat treatment in nitrogen atmosphere presented the best oxidation and wear resistance among the tested coatings. The friction coefficient of the TiAlSiN coatings subjected in nitrogen atmosphere at 400oC was decreased due to the effect of the structure modification by increasing hardness. Using thermogravimetric analyzer (TGA), the result turned out the lowest weight change of TiAlSiN coating after annealing treatment in air if compared to that of all the coatings. The reason my be due to the oxide layer formed on the coating surface acted as a protective layer. Cutting test on the hardened steel with mist oil lubricants, the TiAlSiN-coated WC-Co tool with annealing treatment in nitrogen provides the best wear resistance at the cutting edge.

scholarly journals Effect of Dealloying Time and Post-Annealing on the Surface Morphology and Electrocatalytic Behavior of Nanoporous Copper Films for CO2 Reduction Reaction

2021 ◽  
Author(s):  
Wang-You Zeng ◽  
Jia-Hao Lai ◽  
I-Chung Cheng
Keyword(s):  
Surface Morphology ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
Co2 Reduction ◽  
Annealing Treatment ◽  
Reduction Reaction ◽  
Nanoporous Structure ◽  
Post Annealing ◽  
Nanoporous Copper ◽  
Ligament Size

Abstract Electrocatalytic reduction reaction of CO2 (CO2RR) is one of the promising routes to mitigate global warming via transforming greenhouse gas into valuable chemical feedstocks. By adding proper electrocatalysts, such as nanoporous copper (NPC) with an average ligament size of 37 ± 6 nm, hydrocarbons could be produced at a relatively low overpotential. As the dealloying time increased to 156 hrs, the NPC was transformed into CuO nanosheet structure, which yielded larger electrochemical surface area (ECSA) and current density than the as-prepared NPC films. However, the Faraday efficiency (FE) of the major conversion product, formic acid (HCOOH), decreased from 29 to 8% when the nanosheet structure was used as electrocatalyst. On the other hand, the surface morphology of the NPC films remained similar while the average ligament size increased from 37 to 63 nm after a post-annealing treatment at 500 °C for 4 hrs. Both the current density and ECSA of this post-annealed NPC film were nearly 3 times higher than those of as-prepared NPC film, and the FE toward HCOOH increased from 29 to 45%. X-ray photoelectron spectroscopy and Raman spectroscopy revealed that Cu2O were present on the nanoporous structure, which enhanced the selectivity and FE toward HCOOH in CO2RR.

scholarly journals Pengaruh Annealing terhadap Sifat Keras dan Struktur Mikro Baja Tahan Karat AISI 410-3Mo-3Ni

Metalurgi ◽  
2020 ◽  
Vol 35 (2) ◽  
pp. 75
Author(s):  
Vinda Puspasari ◽  
Mukhlis Agung Prasetyo ◽  
Januarius Velix Ta’an Halab ◽  
Moch. Syaiful Anwar ◽  
Efendi Mabruri ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Martensitic Steel ◽  
Annealing Treatment ◽  
Delta Ferrite ◽  
Carbide Phases ◽  
Annealing Heat Treatment ◽  
Annealing Heat

AISI 410-3Mo-3Ni stainless steel is a martensitic steel which limited in using when compared to austenitic and ferritic stainless steels. Martensitic steel has an essential role in specific components due to a combination of strength, toughness and excellent corrosion resistance. However, martensitic steel tends to undergo decreasing in mechanical properties and microstructure after the forging process. In this study, mechanical properties and microstructure of the forged AISI 410 after receiving annealing heat treatment will be studied. Annealing aims to reduce material hardness and increase grain refinement of material. Annealing heat treatment is carried out by varying the annealing temperature and time. Annealing temperature variations are 7000, 7600, and 8000C. The annealing time variation is 3 hours and 6 hours. The effect of annealing time and temperature will be studied on the hardness and microstructure of the AISI 410 modified material. The optimum hardness of 35.9 HRC in sample with annealing treatment in 760°C for 6 hours. The microstructure shows delta ferrite, martensite, austenite, and carbide phases which affect hardness value of annealed samples.   

Effect of Thickness on Crystal Structure and Magnetic Property of Sr2FeMoO6 Film

2014 ◽  
Vol 894 ◽  
pp. 432-435
Author(s):  
Qin Zhang ◽  
Hui Wang ◽  
Zhen Cui Sun ◽  
Hai Bo Sun
Keyword(s):  
Crystal Structure ◽  
Surface Morphology ◽  
Single Phase ◽  
Annealing Treatment ◽  
Double Perovskite ◽  
Linear Evolution ◽  
Post Annealing ◽  
Electrophoresis Method ◽  
Property Measurement ◽  
Different Thickness

Double perovskite Sr2FeMoO6 film with different thickness was prepared by electrophoresis method on single crystal Si substrate. The post-annealing treatment was carried out at 1100°C with 5% H2/Ar flow. XRD result shows that all the films are of single phase and belong to the I4/m lattice. All the films have no preferred orientation and exhibit typical polycrystal property. Measurement on scanning electron microscope shows that all the three films exhibit similar surface morphology. Different from crystal structure and surface morphology, Curie temperature (TC) shows a non-linear evolution with the thickness of the film. TC of the film increases firstly and then decreases, the highest TC is 300 K. This result indicates that ferromagnetism of the film is strengthened at the thickness about 35μm.

Heat treatment effects on the surface morphology and optical properties of ZnO nanostructures

2010 ◽  
Vol 7 (9) ◽  
pp. n/a-n/a
Author(s):  
M. Zainizan Sahdan ◽  
M. Hafiz Mamat ◽  
M. Salina ◽  
Zuraida Khusaimi ◽  
Uzer M. Noor ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Surface Morphology ◽  
Treatment Effects ◽  
Zno Nanostructures

scholarly journals Titanium Nitride Thin Film Based Low-Redox-Interference Potentiometric pH Sensing Electrodes

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 42
Author(s):  
Shimrith Paul Shylendra ◽  
Wade Lonsdale ◽  
Magdalena Wajrak ◽  
Mohammad Nur-E-Alam ◽  
Kamal Alameh
Keyword(s):  
Thin Film ◽  
Titanium Nitride ◽  
Orange Juice ◽  
Ph Sensor ◽  
Reference Electrode ◽  
Cost Effective ◽  
Ph Sensing ◽  
Ph Sensors ◽  
Potential Shift ◽  
Double Junction

In this work, a solid-state potentiometric pH sensor is designed by incorporating a thin film of Radio Frequency Magnetron Sputtered (RFMS) Titanium Nitride (TiN) working electrode and a commercial Ag|AgCl|KCl double junction reference electrode. The sensor shows a linear pH slope of −59.1 mV/pH, R2 = 0.9997, a hysteresis as low as 1.2 mV, and drift below 3.9 mV/h. In addition, the redox interference performance of TiN electrodes is compared with that of Iridium Oxide (IrO2) counterparts. Experimental results show −32 mV potential shift (E0 value) in 1 mM ascorbic acid (reducing agent) for TiN electrodes, and this is significantly lower than the −114 mV potential shift of IrO2 electrodes with sub-Nernstian sensitivity. These results are most encouraging and pave the way towards the development of miniaturized, cost-effective, and robust pH sensors for difficult matrices, such as wine and fresh orange juice.

scholarly journals Influence of V and Heat Treatment on Characteristics of WMoNbTaV Refractory High-Entropy Alloy Coatings by Mechanical Alloying

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 265
Author(s):  
Chun-Liang Chen ◽  
Sutrisna
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Annealing Treatment ◽  
High Energy ◽  
304 Stainless Steel ◽  
Homogeneous Distribution ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
High Entropy ◽  
Steel Substrates

Refractory high-entropy alloy (RHEA) is one of the most promising materials for use in high-temperature structural materials. In this study, the WMoNbTaV coatings on 304 stainless steel substrates has been prepared by mechanical alloying (MA). Effects of V addition and subsequent heat treatment on properties of the WMoNbTaV coatings were investigated. The results show that the RHEA coatings with nanocrystalline body-centered cubic (BCC) solid-solution phase were generated by the mechanical alloying process. The presence of the V element promotes a uniform microstructure and homogeneous distribution of composition in the RHEA coatings due to improving alloying efficiency, resulting in an increase of hardness. After the annealing treatment of the RHEA coatings, microstructure homogeneity was further enhanced; however, the high affinity of Ta for oxygen causes the formation of Ta-rich oxides. Annealing also removes strain hardening generated by high-energy ball milling and thus decreases the hardness of the RHEA coating and alters microstructure evolution and mechanical properties.

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