Hollow NiFe2O4 microspindles derived from Ni/Fe bimetallic MOFs for highly sensitive acetone sensing at low operating temperatures

2018 ◽  
Vol 5 (5) ◽  
pp. 1107-1114 ◽  
Author(s):  
Xue-Zhi Song ◽  
Fei-Fei Sun ◽  
Shu-Ting Dai ◽  
Xin Lin ◽  
Kai-Ming Sun ◽  
...  
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Cycling Stability ◽  
Acetone Vapor ◽  
Working Temperature ◽  
Highly Sensitive ◽  
Operating Temperatures

A gas sensor based on hollow NiFe2O4 microspindles delivers unprecedentedly high sensitivity towards acetone vapor as well as good selectivity and cycling stability at a low working temperature.

scholarly journals Enhanced Hydrogen Detection in ppb-Level by Electrospun SnO2-Loaded ZnO Nanofibers

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 726 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Jin-Young Kim ◽  
Jae-Hun Kim ◽  
Sang Kim
Keyword(s):  
Gas Sensor ◽  
High Performance ◽  
Hydrogen Gas ◽  
Hydrogen Sensors ◽  
Excellent Performance ◽  
Electrospinning Technique ◽  
Hydrogen Sensing ◽  
Working Temperature ◽  
Highly Sensitive ◽  
Zno Nanofibers

High-performance hydrogen sensors are important in many industries to effectively address safety concerns related to the production, delivering, storage and use of H2 gas. Herein, we present a highly sensitive hydrogen gas sensor based on SnO2-loaded ZnO nanofibers (NFs). The xSnO2-loaded (x = 0.05, 0.1 and 0.15) ZnO NFs were fabricated using an electrospinning technique followed by calcination at high temperature. Microscopic analyses demonstrated the formation of NFs with expected morphology and chemical composition. Hydrogen sensing studies were performed at various temperatures and the optimal working temperature was selected as 300 °C. The optimal gas sensor (0.1 SnO2 loaded ZnO NFs) not only showed a high response to 50 ppb hydrogen gas, but also showed an excellent selectivity to hydrogen gas. The excellent performance of the gas sensor to hydrogen gas was mainly related to the formation of SnO2-ZnO heterojunctions and the metallization effect of ZnO.

scholarly journals Highly sensitive two-dimensional MoS 2 gas sensor decorated with Pt nanoparticles

2018 ◽  
Vol 5 (12) ◽  
pp. 181462 ◽  
Author(s):  
Jaeseo Park ◽  
Jihun Mun ◽  
Jae-Soo Shin ◽  
Sang-Woo Kang
Keyword(s):  
Gas Sensor ◽  
Vapour Deposition ◽  
Limit Of Detection ◽  
Pt Nanoparticles ◽  
High Sensitivity ◽  
Two Dimensional ◽  
Stencil Mask ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Metal Decoration

A two-dimensional molybdenum disulfide (MoS 2 )-based gas sensor was decorated with Pt nanoparticles (NPs) for high sensitivity and low limit of detection (LOD) for specific gases (NH 3 and H 2 S). The two-dimensional MoS 2 film was grown at 400°C using metal organic gas vapour deposition. To fabricate the MoS 2 gas sensor, an interdigitated Au/Ti electrode was deposited using the electron beam (e-beam) evaporation method with a stencil mask. The MoS 2 gas sensor without metal decoration sensitively detects NH 3 and H 2 S gas down to 2.5 and 30 ppm, respectively, at room temperature (RT). However, for improved detection of NH 3 and H 2 S gas, we investigated the functionalization strategy using metal decoration. Pt NP decoration modulated the electronic properties of MoS 2 , significantly improving the sensitivity of NH 3 and H 2 S gas by 5.58× and 4.25×, respectively, compared with the undecorated MoS 2 gas sensor under concentrations of 70 ppm. Furthermore, the Pt NP-decorated MoS 2 sensor had lower LODs for NH 3 and H 2 S gas of 130 ppb and 5 ppm, respectively, at RT.

scholarly journals Nanoporous fluorescent sensor based on upconversion nanoparticles for the detection of dichloromethane with high sensitivity

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 565-571
Author(s):  
Haiyan Wang ◽  
Shiping Zhan ◽  
Xiaofeng Wu ◽  
Lingqiong Wu ◽  
Yunxin Liu
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Anodic Alumina ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Highly Sensitive ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide

We report a highly sensitive nanoporous fluorescence sensor based on core/shell upconversion nanoparticles (UCNPs) for the detection of dichloromethane. UCNPs are deposited on porous anodic alumina oxide templates to form a thin film-like gas sensor.

A highly sensitive room temperature H2S gas sensor based on SnO2 multi-tube arrays bio-templated from insect bristles

2015 ◽  
Vol 44 (17) ◽  
pp. 7911-7916 ◽  
Author(s):  
Junlong Tian ◽  
Feng Pan ◽  
Ruiyang Xue ◽  
Wang Zhang ◽  
Xiaotian Fang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Room Temperature ◽  
High Sensitivity ◽  
Highly Sensitive ◽  
Tube Arrays ◽  
H2s Gas Sensor ◽  
Parallel Effect

A tin oxide multi-tube array with a parallel effect was fabricated, which exhibited high sensitivity to H2S gas at room temperature.

scholarly journals A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7522
Author(s):  
Masanobu Matsuguchi ◽  
Tomoki Nakamae ◽  
Ryoya Fujisada ◽  
Shunsuke Shiba
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Average Diameter ◽  
Chemical Oxidation ◽  
Spherical Particles ◽  
Core Shell ◽  
Polystyrene Microsphere ◽  
In Situ Chemical Oxidation ◽  
Highly Sensitive ◽  
Dispersion Solution

A highly sensitive NH3 gas sensor based on micrometer-sized polyaniline (PANI) spheres was successfully fabricated. The PANI microspheres were prepared via a facile in situ chemical oxidation polymerization in a polystyrene microsphere dispersion solution, resulting in a core–shell structure. The sensor response increased as the diameter of the microspheres increased. The PSt@PANI(4.5) sensor, which had microspheres with a 4.5 μm average diameter, showed the largest response value of 77 for 100 ppm dry NH3 gas at 30 °C, which was 20 times that of the PANI-deposited film-based sensor. Even considering measurement error, the calculated detection limit was 46 ppb. A possible reason for why high sensitivity was achieved is simply the use of micrometer-sized PANI spherical particles. This research succeeded in providing a new and simple technology for developing a high-sensitivity NH3 gas sensor that operates at room temperature.

Fabrication of a one-dimensional tube-in-tube polypyrrole/tin oxide structure for highly sensitive DMMP sensor applications

2017 ◽  
Vol 5 (33) ◽  
pp. 17335-17340 ◽  
Author(s):  
Jaemoon Jun ◽  
Jun Seop Lee ◽  
Dong Hoon Shin ◽  
Jungkyun Oh ◽  
Wooyoung Kim ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Tin Oxide ◽  
Vapor Deposition ◽  
High Sensitivity ◽  
Oxide Structure ◽  
One Dimensional ◽  
Sensor Applications ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

1D tube-in-tube polypyrrole/tin oxide structure was fabricated using electrospinning and vapor deposition polymerization to construct the DMMP gas sensor, which shows high sensitivity and selectivity.

High-sensitivity detection of gold labels by high-angle dark-field STEM imaging

1990 ◽  
Vol 48 (3) ◽  
pp. 892-893 ◽  
Author(s):  
Max T. Otten
Keyword(s):  
High Sensitivity ◽  
Dark Field ◽  
Bright Field ◽  
Backscattered Electron Imaging ◽  
Backscattered Electrons ◽  
Average Atomic Number ◽  
Highly Sensitive ◽  
Backscattered Electron ◽  
Electron Imaging ◽  
High Sensitivity Detection

Labelling of antibodies with small gold probes is a highly sensitive technique for detecting specific molecules in biological tissue. Larger gold probes are usually well visible in TEM or STEM Bright-Field images of unstained specimens. In stained specimens, however, the contrast of the stain is frequently the same as that of the gold labels, making it virtually impossible to identify the labels, especially when smaller gold labels are used to increase the sensitivity of the immunolabelling technique. TEM or STEM Dark-Field images fare no better (Figs. 1a and 2a), again because of the absence of a clear contrast difference between gold labels and stain.Potentially much more useful is backscattered-electron imaging, since this will show differences in average atomic number which are sufficiently large between the metallic gold and the stains normally used. However, for the thin specimens and at high accelerating voltages of the STEM, the yield of backscattered electrons is very small, resulting in a very weak signal. Consequently, the backscattered-electron signal is often too noisy for detecting small labels, even for large spot sizes.

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

scholarly journals Role of MRI evaluation in acute secondary inability to walk in children

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
K. H. Sedeek ◽  
K. Aboualfotouh ◽  
S. M. Hassanein ◽  
N. M. Osman ◽  
M. H. Shalaby
Keyword(s):  
Transverse Myelitis ◽  
High Sensitivity ◽  
Acute Disseminated Encephalomyelitis ◽  
Limb Weakness ◽  
Non Invasive ◽  
Highly Sensitive ◽  
Common Causes ◽  
Bilateral Lower Limb ◽  
Severity Of The Disease

Abstract Background Acute bilateral lower limb weakness is a common problem in children which necessitates a rapid method for diagnosis. MRI is a non-invasive imaging technique that produces high-quality images of the internal structure of the brain and spinal cord. Results MRI was very helpful in reaching rapid and prompt diagnosis in children with acute inability to walk. Acute disseminated encephalomyelitis (ADEM), Guillain–Barré syndrome (GBS), and acute transverse myelitis (ATM) were the most common causes in our study. MRI proved to be of high sensitivity in detecting the lesions and reaching the diagnosis in ADEM and GBS; however, there was no significant relation between the lesions’ size, enhancement pattern, and severity of the disease or prognosis, yet in ATM the site of the lesion and number of cord segment affection were significantly related to the severity of the disease and prognosis. Conclusion MRI is a quick tool to reach the diagnosis of children with acute secondary inability to walk, and to eliminate other differential diagnosis which is essential for proper treatment and rapid full recovery. It is highly sensitive in detecting the lesions, their site and size.

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