xps studies of active elements surface of gas sensors based on wo3nanoparticles
xps studies of active elements surface of gas sensors based on wo3nanoparticles
... Journal of Electron Spectroscopy and Related Phenomena 156–158 (2007) 172–175
XPS studies of active elements surface of gas
sensors based on WO
3−x
nanoparticles
A.P. Shpak, ... work conditions important is the exploration
of the state of sensor’s surface after long contact with air at room
temperature and influence of short-time anneal.
We synthesized nanodispe...
semiconductor gas sensors based on nanostructured tungsten oxide
... place on the surface and hence the
amount of atoms residing at grain surfaces and inter-
faces is critical for controlling the properties of the gas
sensor. It is not uncommon that the portion of ... for
wx
conductance -based gas sensing 10 .
There are only a few earlier studies of the gas
sensing properties of nanocrystalline WO films. In
3
those cases the films were pre...
Tài liệu Báo cáo Y học: Expression and characterization of active site mutants of hevamine, a chitinase from the rubber tree Hevea brasiliensis docx
... suspension was stirred for another
8 h. Subsequently, the protein concentration was increased
to a final concentration of 25 mgÆL
)1
by addition of small
amounts of denatured protein. After one additional ... m
M
MgCl
2
.AtanOD
600
of 0.8–1.0 expression was
induced by addition of isopropyl thio-b-
D
-galactoside to a
final concentration of 0.2 m
M
; 8 h after induction, bacteria
wer...
Báo cáo khoa học: Role of active-site residues of dispersin B, a biofilm-releasing b-hexosaminidase from a periodontal pathogen, in substrate hydrolysis pptx
... activity of the D313N
mutant in SpHex was rationalized by the increased
bulk (COO
–
to CONH
2
) due to the mutation and ⁄ or
by the adaptation of alternate conformations of the
N-acetyl group of the ... conservative mutation at position 27 of DspB
(R27K) affects the activity less than a nonconservative
mutation (R27A). Nevertheless, both substitutions ren-
dered the enzyme significan...
sensitivity properties of a novel no2 gas sensor based on mesoporous wo3 thin film
... WO
3
;NO
2
gas sensor; Sol–gel process
1. Introduction
The detection of NO
2
is important for monitoring environ-
mental pollution resulting from combustion or automotive
emissions [1]. Existing gas ... boundaries
contribute most of the resistance. The surface resistivity of
an oxide crystal depends on the electron concentration near
the surface, which in turn is affected by th...
a selective nh3 gas sensor based on fe2o3–zno nanocomposites at room temperature
... the current response of the gas sensors basedon Fe
2
O
3
–ZnO
nanocomposites with different compositions of Fe:Zn as a
function of time was measured. The same testing conditions
were applied for ... interactions with a
sensor based on heterojunction oxide structures. The reactivity
of oxides in acid–base reactions depends on the electronegativ-
ity of the metal cation. The...
ammonia gas sensor based on electrosynthesized polypyrrole films
... we can plot the variation of
the slope versus ammonia concentrations. Fig. 6b represents the
evolution of the slope versus the ammonia concentration. Above
concentrations of 500 ppm, we noticed ... in gas sensors for the detection of ethanol gas [54], benzene,
xylene and toluene [55].
Other studies focused on ammonia gas sensors using polypyr-
role as sensitive layer. Th...
room-temperature semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film
... operate on
the basis of the modification of electrical conductivity of
metal oxide layers, resulting from the interactions between
ionosorbed moieties such as O
2
−
,O
−
, and O
2−
species and gas
molecules ... superior to
those of conventional MOS.
5
In addition, the compatibility
of wet processes with microelectronic fabrication offers par-
ticular opportunities for development...
room-temperature semiconductor gas sensor based on nonstoichiometric
... operate on
the basis of the modification of electrical conductivity of
metal oxide layers, resulting from the interactions between
ionosorbed moieties such as O
2
−
,O
−
, and O
2−
species and gas
molecules ... superior to
those of conventional MOS.
5
In addition, the compatibility
of wet processes with microelectronic fabrication offers par-
ticular opportunities for development...
Tài liệu active visual inference of surface shape roberto cipolla doc
... parameterisation
direction for the image curve. A convenient parameterisation is to choose the
direction of the curve normal so that it is on the same side of the image contour
as the projection of the ...
4.5 Ego-motion from the image motion of curves
We have seen that under the assumption of known viewer motion constraints on
surface shape can be derived from the deform...
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