scholarly journals Synthesis and Characterization of Ultrafine Ag/ZnO Nanotetrapods (AZNTP) for Environment Humidity Sensing

2018 ◽  
Vol 5 (2) ◽  
pp. 115-119
Author(s):  
Babak Sadeghi
Keyword(s):  
High Surface ◽  
High Sensitivity ◽  
Particle Morphology ◽  
Separation System ◽  
Humidity Sensing ◽  
Physisorbed Water ◽  
Heat Regeneration ◽  
High Surface Activity

Ag/ZnO nanotetrapods (AZNTP) are prepared using silver (I)–bis (oxalato) zinc complex and 1, 3-diaminopropane (DAP) under a phase separation system. This crystal structure and lattice constant of the AZNTP was investigated by means of XRD, TEM, and UV-vis spectrum. AZNTP films with 23 nm in arm diameter and high surface activity work at room temperature as humidity sensors. AZNTP have shown some properties including quick response with high sensitivity, a longer life span and recovery, and no need for heat regeneration. Moreover, AZNTP could form OH group with physisorbed water in wet environments. The results of the present study demonstrated that the growth and characterization of AZNTP for environmental humidity sensing and DAP play an original role in the determination of particle morphology. Ultra-thin AZNTP has also been tested as a resistance sensor, having an unusual high sensitivity to moisture.

Controlled Growth and Characterization Ag/ZnO Nanotetrapods for Humidity Sensing

2018 ◽  
Vol 21 (7) ◽  
pp. 462-467
Author(s):  
Babak Sadeghi
Keyword(s):  
Room Temperature ◽  
Zinc Complex ◽  
Water Solution ◽  
Particle Morphology ◽  
Quick Response ◽  
Separation System ◽  
Humidity Sensing ◽  
Sensor Material ◽  
Highly Sensitive

Aim and Objective: Ultrafine Ag/ZnO nanotetrapods (AZNTP) have been prepared successfully using silver (I)–bis (oxalato) zinc complex and 1, 3-diaminopropane (DAP) with a phase separation system, and have been injected into a diethyl/water solution. Materials and Methods: This crystal structure and lattice constant of the AZNTP obtained were investigated by means of a SEM, XRD, TEM and UV-vis spectrum. Results: The results of the present study demonstrated the growth and characterization AZNTP for humidity sensing and DAP plays a key role in the determination of particle morphology. AZNTP films with 23 nm in arm diameter have shown highly sensitive, quick response sensor material that works at room temperature.

scholarly journals A novel biosensor based on Blu-ray disc coating film for determination of total amino acid content in tea leaves

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 39666-39671
Author(s):  
Lanling Chu ◽  
Yunzheng Wang ◽  
Yu Zhou ◽  
Xuejun Kang
Keyword(s):  
Low Cost ◽  
High Surface ◽  
Amino Acid Content ◽  
Substrate Material ◽  
Total Amino Acid ◽  
Coating Film ◽  
The Novel ◽  
Total Amino Acid Content ◽  
High Surface Activity

The novel biosensor substrate material based on a simple BD coating film displayed preferable merits with high surface activity, low cost, easy making, easy using, and extensive application prospect.

Stray light and ghosts in catadioptric spectrometers: incorporating grating scatter measurements into simulations and ghost sensitivity into system design

2018 ◽  
Vol 7 (6) ◽  
pp. 377-386 ◽  
Author(s):  
Monika Kroneberger ◽  
Andreas Mezger ◽  
Stephanie Becker
Keyword(s):  
High Sensitivity ◽  
Stray Light ◽  
Multiple Diffraction ◽  
Optical Elements ◽  
Optical Instruments ◽  
Light Requirements ◽  
Measurement Results ◽  
Selection Of

Abstract The accurate simulation of stray light is essential for the verification of the contrast requirements in optical instruments. In a spectrometer, the scattering from reflective gratings is difficult to characterize while contributing significantly to the overall system stray light and reduction of the spectrometer contrast. In addition, the multiple diffraction orders create a ghost sensitive environment, which must be considered in the design of the instrument. In this article, we present an experimental setup for, and measurement results from, the characterization of the bidirectional scattering distribution function (BSDF) of a holographic grating for a spectrometer applied in a typical earth observation mission with demanding stray light requirements. We observed distinct stray light peaks out of the diffraction plane, which are called ‘satellites.’ The main challenges in the measurement of grating BSDFs arise from the near angle limit, the determination of the instrument signature and the selection of the appropriate sampling (2D or 3D). Following the grating characterization, the next step is to introduce these measured BSDFs into stray light simulation. We have done that by fitting appropriate functions to the measured BSDF and defining them in the optical analysis software ASAP as a user-defined BSDF. Ghost analysis is done at the spectrometer level as a sensitivity analysis of the tilts of the optical elements. Due to the ghosting of higher diffraction orders of the grating, a high sensitivity to the tilts of some of the optical elements can be seen.

Cryomicroscopy of low-Tg latex particles via freeze drying

1993 ◽  
Vol 51 ◽  
pp. 1198-1199
Author(s):  
J. R. Reffner
Keyword(s):  
Electron Microscopy ◽  
Freeze Drying ◽  
Room Temperature ◽  
Film Formation ◽  
Direct Determination ◽  
Particle Morphology ◽  
Latex Particles ◽  
Transmission Electron

Transmission Electron Microscopy (TEM) is a powerful tool for investigating the structure of latex particles. However, examining low Tg (glass transision, Tg < room temperature) latex particles requires special techniques due to the significant deformation which occurs if the particles are dispersed onto a substrate at room temperature. Here a freeze drying (FD) technique is presented which permits individual emulsion particles, including stained particles, to be examined in a manner that minimizes deformation by maintaining the particles at temperatures below Tg.Typically, particle morphology is determined from images of individual latex particles dispersed onto a supporting ultra-thin substrate or from images of ultra-microtomed sections of films cast from the latex. Examining particles dispersed onto a substrate is often advantageous, allowing direct determination of particle shape and characterization of the morphology prior to the film formation process. Although low Tg materials can be examined using this technique, information about the size, shape and morphology of phase separated domains can be obscured by the deformation which occurs when the particles are examined at room temperature.

CdSe Quantum Dots Decorated by 3-Aminobenzeneboronic Acid as Fluorescence Probe for Glucose

2011 ◽  
Vol 306-307 ◽  
pp. 1338-1341
Author(s):  
Shao Wei Wang ◽  
Xia Ona Zhang ◽  
Jing Hua Yu
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
High Sensitivity ◽  
Cdse Quantum Dots ◽  
Optimal Conditions ◽  
Cdse Qds ◽  
Relative Standard ◽  
Sensitivity And Selectivity

A simple route to the production of high-quality CdSe quantum dots (QDs) is presented. The characterization of CdSe QDs was measured by Zetasizer Nano ZS, ultraviolet-visible spectoscopy and fluorospectrophotometer. The CdSe QDs were decorated by 3-Aminobenzeneboronic acid to obtain good fluorescent characteristic. Under the optimal conditions, the decreased normalized absorbance was linear to the concentration of glucose from 1.0×10−7 to 2.9×10−6 mol·L-1with a detection limit of 5.0´10-8mol·L-1. The relative standard deviation (RSD) for the determination of 1.0×10-7mol·L-1was 1.4 % by 11 replicate determination. In this paper, the fluorescent behavior of glucose with the decorated CdSe QDs was studied, and it is found that the system has a high sensitivity and selectivity for analysis of glucose.

Characterization of High Surface Area Silicon Oxynitrides

1992 ◽  
Vol 271 ◽  
Author(s):  
Peter W. Lednor ◽  
Rene De Ruiter ◽  
Kees A. Emeis
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
X Ray ◽  
Silicon Oxynitrides

ABSTRACTHigh surface area silicon oxynitrides have been prepared by nitrida- tion of silica with ammonia. Characterization by Fourier-transform infrared spectroscopy has allowed quantitative determination of hydroxyl, amido and imido groups. Data obtained by X-ray photoelectron spectroscopy show that the nitrogen is well distributed in the surface of the materials.

Atom-Probe-Tomographic Studies on Silicon-Based Semiconductor Devices

2012 ◽  
Vol 20 (5) ◽  
pp. 38-44 ◽  
Author(s):  
Koji Inoue ◽  
Ajay Kumar Kambham ◽  
Dominique Mangelinck ◽  
Dan Lawrence ◽  
David J. Larson
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Semiconductor Devices ◽  
High Sensitivity ◽  
Atom Probe ◽  
Atomic Scale ◽  
Specimen Preparation ◽  
Silicon Based

The development of laser-assisted atom probe tomography (APT) and specimen preparation techniques using a focused ion beam equipped with high-resolution scanning electron microscopy (SEM) has significantly advanced the characterization of semiconductor devices by APT. The capability of APT to map out elements in devices at the atomic scale with high sensitivity meets the characterization requirements of semiconductor devices such as the determination of elemental distributions for each device region.

Study on Synthesis and Characterization of a Fluorescence Probe and its Application for Determination of Superoxide Anion Radical

2011 ◽  
Vol 393-395 ◽  
pp. 1483-1487 ◽  
Author(s):  
Yong Qiang Zhao ◽  
Hong Lin ◽  
Lai Hao Li ◽  
Xian Qing Yang ◽  
Shu Xian Hao ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Fluorescence Probe ◽  
High Sensitivity ◽  
Superoxide Anion Radical ◽  
Synthetic Product ◽  
Pyrogallol Autoxidation

A novel Schiff base, 2-(Salicylideneamino)pyridine (2-SAP) synthesized by 2-aminopyridine and salicylaldehyde was used as a fluorescence probe to determine superoxide anion radical (O2•-) in this study. The synthetic product was characterized by IR, 1H-NMR and GC-MS methods. A fluorescence quenching reaction occurs between 2-SAP and O2•-, and the fluorescence intensity decreased significantly. The effect of pyrogallol concentration (2.0×10-5 M to1.0×10-3 M) was discussed in this study. In the range from 2.0×10-5 M to 1.0×10-4 M, relative fluorescence intensity (y) and pyrogallol concentration (x) shown a good linear relationship, y=37.801x+76.854, r=0.993. Based on this phenomenon, the O2•- generated by pyrogallol autoxidation could be determined simply with high sensitivity.

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