Impedance Characteristics of Electrospun Nylon-6/TiO2 Nanocomposite for Humidity Sensor

2011 ◽  
Vol 471-472 ◽  
pp. 542-547 ◽  
Author(s):  
Alireza Hosseinmardi ◽  
M. Keyanpour-Rad ◽  
F. Alikhani Hesari
Keyword(s):  
Electron Microscopy ◽  
Relative Humidity ◽  
Low Cost ◽  
Fast Response ◽  
Nylon 6 ◽  
Nano Composite ◽  
Tio2 Nanofibers ◽  
Transition Electron Microscopy ◽  
Impedance Characteristics ◽  
Transition Electron

Resistive relative humidity (RH) sensors were fabricated by nano composites of nylon-6 and titanium dioxide nanopowders. The results indicated that these sensors can be fabricated as a reliable, low cost and fast response instruments. Different percentages of nylon-6 and TiO2 were studied and average diameters of the resultant nanofibers were found the 80 to 120 nm. The nano composite of nylon-6/TiO2 nanofibers was electrospun on the interdigital gold electrode on the glass substrate. It was found that the impedance of the mat ranged from 107 Ω to 102 Ω while the relative humidity was increased from 11% RH and 97.3% at room temperature. Transition electron microscopy (TEM) and scanning electron microscopy (SEM) were used to study the morphology of the nano composite.

Strengthening of CP-Ti by Rolling at Room Temperature

2010 ◽  
Vol 667-669 ◽  
pp. 737-741
Author(s):  
Jian Hua Jiang ◽  
Yi Ding ◽  
Ai Dang Shan
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Mechanical Test ◽  
Commercial Purity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Electron Microscopy ◽  
Microstructure Observation ◽  
Cp Ti ◽  
Transition Electron

The effects of asymmetric and symmetric rolling at room temperature on mechanical properties and microstructure of the commercial purity Ti were investigated by means of mechanical test, optical microscopy, X-ray diffraction and transition electron microscopy. The results show that through asymmetric and symmetric rolling processes the ultimate tensile strength is substantially increased from 450 MPa to 960 MPa. Microstructure observation illustrates this variation in mechanical property is caused by the grain refinement and work hardening.

The Obtaining of Porous Strong Ceramics from Nano-Hydroxyapatite

2008 ◽  
Vol 3 (4) ◽  
pp. 40-46
Author(s):  
Dmitriy Yu. Trufanov ◽  
Andrey V. Nomoev ◽  
Molon D. Buyatuev ◽  
Dashima Zh. Bazarova ◽  
Deleg Sangaa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Grain Size ◽  
Porous Ceramics ◽  
X Ray ◽  
Transition Electron Microscopy ◽  
Gas Penetration ◽  
Transition Electron ◽  
Scanning Electron

The present paper describes the possibility of strong porous ceramics preparation from hydroxyapatite nanopowders. The as-dried hydroxyapatite nanopowders were uniaxially compacted and sintered. The sintered ceramics and nanopowders were analyzed by methods of transition electron microscopy, scanning electron microscopy and X-ray phase diffraction. The ceramics gas-penetration and hardness were measured. The methods of pore control were tested. The ceramics samples with open equally dispersed pores were received; the pores and grain size is about micron and less. The results are useful for making medical implantate and membrane ceramics with controlled pores size.

Low-Cost Preparation of SBA-15 Silica Molecular Sieve and High Humidity Sensing Property in a Wide Range of Relative Humidity

2016 ◽  
Vol 852 ◽  
pp. 1455-1462
Author(s):  
Jie Zhang ◽  
Yong Heng Zhu ◽  
Shi Zao Kang ◽  
Xiang Qing Li ◽  
Jia Qiang Xu
Keyword(s):  
Relative Humidity ◽  
Molecular Sieves ◽  
Low Cost ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nitrogen Adsorption ◽  
Fast Response ◽  
Humidity Sensing ◽  
Wide Range

In this paper, different SBA-15 molecular sieves were prepared in a facile sol-gel method by using a low-cost sodium silicate as silicon source at different ripening temperature. The materials were characterized by small-angle XRD, TEM, nitrogen adsorption–desorption test. The results showed that ripening temperature can affect the pore size and mesostructure of SBA-15. High surface area SBA-15 can be obtained at low ripening temperature, and plugged mesostructure can be prepared at high temperature. The gravimetric humidity sensing property of the materials were tested based on a transducer of quartz crystal microbalance. The test results revealed that all the samples showed high response in the wide range of relative humidity. The sensors based on that prepared at 35°C show a good stability and linearity in the range of 11.3%RH to 98%RRH along with fast response (12s) and recovery time (8s), ultrahigh sensitivity and low hysteresis, implying that has a great potential for humidity detection.

scholarly journals Effect of ligand substitution in [Fe(H-trz)2(trz)]BF4 spin crossover nanoparticles

2015 ◽  
Vol 3 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Iurii Suleimanov ◽  
José Sanchez Costa ◽  
Gábor Molnár ◽  
Lionel Salmon ◽  
Igor Fritsky ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transition Temperature ◽  
Coordination Compounds ◽  
Room Temperature ◽  
Spin Crossover ◽  
Magnetic Measurements ◽  
Ligand Substitution ◽  
Crossover Temperature ◽  
Transition Electron Microscopy ◽  
Transition Electron

Spin crossover iron(II) 1,2,4-triazole-based coordination compounds in the form of nanoparticles were prepared using a reverse microemulsion technique. Ligand substitution approach was applied to decrease the spin crossover temperature towards room temperature in the well-known [Fe(Htrz)2(trz)]BF4 complex. The compositions of the particles were determined by elemental analysis and thermogravimetry. The morphology was monitored by transition electron microscopy (TEM). The effect associated with the ligand substitution was investigated by optical and magnetic measurements. Transition temperature has been reduced by 33 K comparing the unsubstituted sample to that with 5 % substitution.

scholarly journals High Sensitivity of Ammonia Sensor through 2D Black Phosphorus/Polyaniline Nanocomposite

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3026
Author(s):  
Zuquan Wu ◽  
Lei Liang ◽  
Shibu Zhu ◽  
Yifan Guo ◽  
Yao Yao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
Oxidative Polymerization ◽  
High Sensitivity ◽  
Fast Response ◽  
Experimental Result ◽  
Conjugation System ◽  
Detection Range ◽  
Sensing Material ◽  
Response And Recovery

Recently, as a two-dimensional (2D) material, black phosphorous (BP) has attracted more and more attention. However, few efforts have been made to investigate the BP/polyaniline (PANI) nanocomposite for ammonia (NH3) gas sensors. In this work, the BP/PANI nanocomposite as a novel sensing material for NH3 detection, has been synthesized via in situ chemical oxidative polymerization, which is then fabricated onto the interdigitated transducer (IDTs). The electrical properties of the BP/PANI thin film are studied in a large detection range from 1 to 4000 ppm, such as conduction mechanism, response, reproducibility, and selectivity. The experimental result indicates that the BP/PANI sensor shows higher sensitivity and larger detection range than that of PANI. The BP added into PANI, that may enlarge the specific surface area, obtain the special trough structure for gas channels, and form the p–π conjugation system and p–p isotype heterojunctions, which are beneficial to increase the response of BP/PANI to NH3 sensing. Meanwhile, in order to support the discussion result, the structure and morphology of the BP/PANI are respectively measured by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV−vis), transmission electron microscopy (TEM), and field emissions scanning electron microscopy (SEM). Moreover, the sensor shows good reproducibility, and fast response and recovery behavior, on NH3 sensing. In addition, this route may offer the advantages of an NH3 sensor, which are of simple structure, low cost, easy to assemble, and operate at room temperature.

Synthesis and Characterization of Hierarchical Zeolite with High Mechanical Stability

2011 ◽  
Vol 217-218 ◽  
pp. 368-371 ◽  
Author(s):  
Xu Ling ◽  
Rui Liu Zong ◽  
Bin Kan Qiu
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Mechanical Stability ◽  
Three Dimensions ◽  
X Ray Diffraction ◽  
Polystyrene Spheres ◽  
Hierarchical Zeolite ◽  
Transition Electron Microscopy ◽  
Transition Electron

A hierarchical zeolite was synthesized by self-assembly of ZSM-5 nano-crystals colloid and polystyrene spheres coated with cationic poly (diallyldimethylammonium chloride). The colloidial ZSM-5 nano-crystals were first bound onto the polyelectrolyte-modified PS by electrostatic attraction, followed by centrifugation to form PS/ZSM-5 close-packed composite. After being dried and calcined to remove the organic components, the hierarchical zeolite was obtained. The X-ray diffraction, scanning electron microscopy, transition electron microscopy and N2 adsorp-tion-desorption techniques were employed to characterize the hierarchical zeolite. The results showed that the material prepared by this method was well crystallized and possessed uniform ma-cropores interconnected in three dimensions through windows. Furthermore, the hierarchical zeolite was rather mechanically stable.

scholarly journals The effect of a new route on the microstructure and property of 6063 alloy during the ECAP deformation

2021 ◽  
Vol 2125 (1) ◽  
pp. 012052
Author(s):  
Nannan Zhao ◽  
Chunyan Ban
Keyword(s):  
Electron Microscopy ◽  
Cross Sections ◽  
Work Hardening ◽  
Al Alloy ◽  
High Angle ◽  
Homogeneous Microstructure ◽  
Transition Electron Microscopy ◽  
Rotation Scheme ◽  
6063 Al Alloy ◽  
Transition Electron

Abstract The microstructures and hardness of 6063 Al alloy subjected to different ECAP route (Bc and the new route) were investigated. These two routes have different rotation scheme of a sample around its long axis between two consecutive ECAP passes: Bc route, by which sample were rotated in the same direction by 90°; the new route, by which sample were rotated in the same direction by 135°. The feature microstructures of the samples subjected to the two routes were investigated by the optical microscopy (OM) and transition electron microscopy (TEM), respectively. In comparison, the pressing by the new route produces more homogeneous microstructure with the higher fraction of high angle boundaries. Furthermore, the hardness results showed that work hardening can be observed and do not depend much on the ECAP route. However, distribution of hardness in cross-sections of samples revealed that processing to total passes number of eight by the new route improves deformation uniformity.

WO3 Nanostructures Synthesized by a Sonochemical Strategy

2009 ◽  
Vol 60-61 ◽  
pp. 16-21 ◽  
Author(s):  
Shi Bin Sun ◽  
Zeng Da Zou ◽  
Guang Hui Min
Keyword(s):  
Electron Microscopy ◽  
Tungsten Trioxide ◽  
Selective Adsorption ◽  
Morphological Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Electron Microscopy ◽  
Tungsten Hexachloride ◽  
Solvent Molecules ◽  
Transition Electron

A simple sonochemical synthesis of tungsten trioxide hydrate with various morphologies has been developed by using tungsten hexachloride (WCl6) as precursor and water, ethanol and their mixture as solvent, followed by annealing in a tube furnace. The resulting products were structurally characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transition electron microscopy (TEM) and differential thermal analysis (DTA). Results show that nanowhiskers emanating from the core of nanoparticles have been obtained with ethanol as solvent, and that nanoplates and nanosheets were formed when water and/or mixed ethanol and water was used as the solvent, respectively. The continuous changing supersaturation of tungsten trioxide may account for the formation of nanowhiskers. The formation of nanoplates or nanosheets may be associated with the selective adsorption of solvent molecules on the WO3 crystals. Due to a combination of the loss of chemical bonded water and crystal growth, the as-synthesized tungsten trioxide hydrate underwent apparent morphological evolution during thermal processing.

One-Step Hydrothermal Controlled Synthesis of HgTe Nanorods

2013 ◽  
Vol 303-306 ◽  
pp. 2667-2670
Author(s):  
Kun Peng Jiang ◽  
Li Jiang ◽  
Lei Liao ◽  
Wei Ping Yu ◽  
Ai Miao Qin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Roughness ◽  
Hydrothermal Synthesis ◽  
Controlled Synthesis ◽  
X Ray ◽  
Transition Electron Microscopy ◽  
One Step ◽  
Transition Electron ◽  
Scanning Electron

This paper describes a one-step hydrothermal synthesis of rod-shaped HgTe nanocrystals (NCs). X-ray powder diffraction (XRD), field scanning electron microscopy (FE-SEM), transition electron microscopy (TEM) and energy-dispersive X-ray analysis (EDX) have been used to characterize the HgTe NCs. The length, diameter, surface roughness and the aspect ratio of the HgTe nanorods are well controlled through Te precursor, reaction time and reductant.

A Single Source Approach To Deposition Of Nickel and Palladium Sulfide Thin Films By LP-MOCVD

2002 ◽  
Vol 744 ◽  
Author(s):  
J. Waters ◽  
P. O'Brien ◽  
J.H. Park
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Chemical Vapour ◽  
Organic Chemical ◽  
X Rays ◽  
Single Source ◽  
Transition Electron Microscopy ◽  
Glass Substrates ◽  
Metal Organic ◽  
Transition Electron

ABSTRACTCompounds of the type M(S2CNRR’)2, M = Ni(II), Pd(II), RR' = Et2, MeEt and MenBu, have been synthesized and used as single-source precursors for the fabrication of NiS and PdS thin films via low-pressure (LP) metal-organic chemical vapour deposition (MOCVD). The phase of nickel sulfide films deposited on glass substrates was found to be NiS1.03 or a mixture of NiS1.03 and NiS, whilst palladium sulfide films were only tetragonal PdS. The films have been characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), transition electron microscopy (TEM) and energy dispersive analysis of X-rays (EDAX).

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