Molybdenum carbide chemical sensors with ultrahigh signal-to-noise ratios and ambient stability

2018 ◽  
Vol 6 (46) ◽  
pp. 23408-23416 ◽  
Author(s):  
Soo-Yeon Cho ◽  
Ju Ye Kim ◽  
Ohmin Kwon ◽  
Jihan Kim ◽  
Hee-Tae Jung
Keyword(s):  
Chemical Sensors ◽  
Molybdenum Carbide ◽  
Gas Sensing ◽  
High Signal ◽  
Signal To Noise ◽  
Molybdenum Carbides ◽  
First Time ◽  
Sensing Performance

In this study, we investigate the gas sensing performance of molybdenum carbides for the first time and they show ultra-high signal-to-noise ratios and excellent ambient stability.

A Study of the Orbital and Intrinsic Variability of the Double-Lined Spectroscopic Binary β Centauri

2002 ◽  
Vol 185 ◽  
pp. 86-87
Author(s):  
M. Ausseloos ◽  
C. Aerts ◽  
K. Uytterhoeven
Keyword(s):  
High Resolution ◽  
Orbital Motion ◽  
High Signal ◽  
Mass Ratio ◽  
Eccentric Orbit ◽  
Intrinsic Variability ◽  
Signal To Noise ◽  
Orbital Parameters ◽  
Spectroscopic Binary ◽  
First Time

AbstractWe introduce our observational study of the orbital motion of β Cen. Using 463 high signal-to-noise, high-resolution spectra obtained over a timespan of 12 years it is shown that the radial velocity of β Cen varies with an orbital period of 357.0 days. We derive for the first time the orbital parameters of β Cen and find a very eccentric orbit (e = 0.81) and similar component masses with a mass ratio M1/M2 = 1.02. Both the primary and the secondary exhibit periodic line-profile variations.

scholarly journals The well correlated diffuse interstellar bands at λλ 6196, 6614 Å and their possible companions

2020 ◽  
Vol 496 (2) ◽  
pp. 2231-2240
Author(s):  
A Bondar
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
High Resolution ◽  
Aromatic Hydrocarbons ◽  
Correlation Coefficients ◽  
High Signal ◽  
Signal To Noise ◽  
B Stars ◽  
Diffuse Interstellar Bands ◽  
Polycyclic Aromatic ◽  
First Time

ABSTRACT Considered here is the interrelation between five diffuse interstellar bands (DIBs), λλ 5545, 6113, 6196, 6445 and 6614 Å. Two DIBs (λλ 6196 and 6614 Å) are already known as being well correlated with each other; their relation with three other weaker bands is investigated for the first time. To accomplish this task, high-resolution spectra (λ/δλ ≈100 000) with high signal-to-noise ratios (S/N) of 54 hot O–B stars with reddening 0.12–1.45 mag were used. Analysis of measured equivalent widths has allowed us to establish linear dependences and evaluate linear correlation coefficients as high as 0.968–0.988 between the intensities of these five DIBs. Such a degree of correlation may indicate their common origin. Several spacings in wavenumbers found between these DIBs correspond to the energies of vibrational transitions in some polycyclic aromatic hydrocarbons resulting in IR emissions at λλ 16.4, 11.3, 7.7, 6.2 and 3.3 μm.

scholarly journals Multicomponent Metal Oxide Nanostructures: Fabrication and Study of Core Issues to Improve Gas Sensing Performance

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 970
Author(s):  
Vardan Galstyan ◽  
Andrea Ponzoni ◽  
Iskandar Kholmanov ◽  
Marta M. Natile ◽  
Antonella Glisenti ◽  
...  
Keyword(s):  
Chemical Sensors ◽  
Gas Sensing ◽  
Cost Effective ◽  
Sensing Properties ◽  
Oxide Nanostructures ◽  
Porous Titania ◽  
Metal Oxide Nanostructures ◽  
Potential Applications ◽  
Core Issues ◽  
Sensing Performance

We have obtained and studied the sensing properties of porous titania-based nanostructures. The materials have been prepared using cost-effective techniques. The morphological and structural analyses of the prepared materials have been performed. The sensing properties of the samples have been studied towards carbon monoxide. The obtained results demonstrate that the prepared structures are promising for the potential applications in the area of chemical sensors for the environmental monitoring.

High Signal‐to‐Noise Chemical Sensors Based on Compensated Organic Transistor Circuits

2019 ◽  
Vol 4 (10) ◽  
pp. 1900410 ◽  
Author(s):  
Yingli Chu ◽  
Hui Li ◽  
Jia Huang ◽  
Howard E. Katz
Keyword(s):  
Chemical Sensors ◽  
High Signal ◽  
Signal To Noise ◽  
Organic Transistor ◽  
Transistor Circuits

scholarly journals NGC 6302: high-ionization permitted lines. Applying X-SSN synthesis to VLT-UVES spectra

2011 ◽  
Vol 7 (S283) ◽  
pp. 470-471
Author(s):  
Daniel Péquignot ◽  
Christophe Morisset ◽  
Simon Casassus
Keyword(s):  
High Signal ◽  
Signal To Noise ◽  
High Ionization ◽  
Spectrum Synthesis ◽  
First Time

AbstractA preliminary VLT-UVES spectrum of NGC 6302 (Casassus et al. 2002, MN), which hosts one of the hottest PN nuclei known (Teff ~ 220000 K; Wright et al. 2011, MN), has been recently analysed by means of X-SSN, a spectrum synthesis code for nebulae (Morisset and Péquignot). Permitted recombination lines from highly-ionized species are detected/identified for the first time in a PN, and some of them probably for the first time in (astro)physics. The need for a homogeneous, high signal-to-noise UVES spectrum for NGC 6302 is advocated.

Hydrothermal Synthesis and Ethanol-Sensing Properties of MoO3 Nanobelts

2013 ◽  
Vol 575-576 ◽  
pp. 61-64 ◽  
Author(s):  
Min Na Liu ◽  
Qian Qian Chen ◽  
Xin Lu ◽  
Lian Fang Ge ◽  
Li Yin ◽  
...  
Keyword(s):  
Chemical Sensors ◽  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
Ethanol Vapor ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Volatile Organic ◽  
Ethanol Sensing ◽  
Sensing Performance

Uniform MoO3 nanobelts were synthesized through a fast and simple hydrothermal route without any other agents. The hydrothermal reaction was performed at 180 °C for 12 h using a HNO3 aqueous solution as the solvent. The phases and microstructures were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the sample obtained was an orthorhombic MoO3 phase, and had a belt-like morphology with lengths of 510 μm and apparent widths of about 220 nm. The MoO3 nanobelts obtained were used as the sensing materials to fabricate chemical sensors for detection of some volatile organic compounds (VOCs) (including ethanol, methanol, isopropanol, acetone, methanal, and benzene). The gas-sensing results indicated that the sensor of the α-MoO3 nanobelts has enhanced ethanol-sensing performance, e.g., with the highest sensitivity of Sr =144 for 500 ppm ethanol vapor operating at 300 °C.

Electroionization study of ethylene: structures in the ionization and appearance curves

1987 ◽  
Vol 65 (7) ◽  
pp. 803-807 ◽  
Author(s):  
Pierre Plessis ◽  
Paul Marmet
Keyword(s):  
Carbon Atom ◽  
High Signal ◽  
Signal To Noise ◽  
Monoenergetic Electron ◽  
Text Production ◽  
Text Fragment ◽  
First Time ◽  
Fragmentation Processes ◽  
Fragment Production ◽  
Very High

Ionization-efficiency curves with very high signal-to-noise ratios for ethylene and all fragments consisting of at least one carbon atom are presented and analyzed. The curves are produced by monoenergetic electron impact and extend up to 10 eV above threshold. Most of the structures observed thus far by this method for these regions are reported here for the first time. Competition between [Formula: see text] production and [Formula: see text] and [Formula: see text] fragment production is clearly seen in the respective curves. Features occurring at the same energy in several of the curves indicate that these are due to a common progenitor, particularly the [Formula: see text] complex. The appearance of different fragmentation processes accounts for the onset-type structure found in some of the fragment-ion curves.

scholarly journals Facile Synthesis of SnO2/LaFeO3−XNX Composite: Photocatalytic Activity and Gas Sensing Performance

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1163 ◽  
Author(s):  
Xi-Tao Yin ◽  
Davoud Dastan ◽  
Fa-Yu Wu ◽  
Jing Li
Keyword(s):  
High Performance ◽  
Superoxide Radical ◽  
Gas Sensing ◽  
Dye Degradation ◽  
Surface States ◽  
Wet Chemical Method ◽  
Probable Reaction ◽  
Wet Chemical ◽  
First Time ◽  
Sensing Performance

Here SnO2/LaFeO3−XNX composite was fabricated using a wet chemical method and was applied to pollutants degradation and gas sensing for the first time. The composite exhibits high performance for photocatalytic degradation of Rhodamine B (RhB) dye and selectivity sensing of various gases. On the basis of the completed experiments, the improved RhB degradation and selective gas sensing performance resulted from the extended optical absorption via N2 incorporated surface states and enhanced charge separation via coupling SnO2. Using the scavengers trapping experiments, the superoxide radical (O2•−) was investigated as the major scavenger involved in the degradation of RhB over SnO2/LaFeO3−XNX composite. In this paper, the probable reaction steps involved in the RhB dye degradation over SnO2/LaFeO3−XNX composite are proposed. This work will provide reasonable strategies to fabricate LaFeO3-based proficient and stable catalysts for environmental purification. In addition, the result of the selectivity of gas performance is also presented.

scholarly journals Physical conditions in the NGC 6334 molecular cloud derived from non-LTE NH3(J,K)=(1,1) transitions

2002 ◽  
Vol 206 ◽  
pp. 240-243
Author(s):  
Anderson Caproni ◽  
Zulema Abraham ◽  
José W. S. Vilas-Boas
Keyword(s):  
Star Formation ◽  
Molecular Cloud ◽  
Signal To Noise Ratio ◽  
High Signal ◽  
Physical Parameters ◽  
Signal To Noise ◽  
Line Shapes ◽  
Physical Conditions ◽  
Ngc 6334 ◽  
First Time

The high signal-to-noise ratio of the NH3(J,K) = (1,1) spectra from NGC 6334 have allowed at a first time a detailed study of departures from LTE conditions in this molecular cloud. Differences in the line shapes have shown that the surveyed region is composed of at least three overlapped sources in different stages of star formation. Comparison between physical parameters of NGC 6334 derived from LTE and non-LTE conditions are presented and discussed here.

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